(b) terylene Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Blended fibres are fibres that are obtained by blending natural fibres with synthetic fibres. (b) Thermoplastics are not used for making saucepan handles. Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. 1. (d) they can coloured by adding pigments. Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download is available here. Soln: Answer is (b) Rayon. Which of the following statements is true for rayon? (e) Blended fabrics are made by the combination of natural and synthetic fibres. 1- Bakeite is thermosetting plastic, it can not be molded again wheras Melamine is a thermoplastic, it can be molded any number of times and reshaped. synthetic fibers and plastics; class-8; Share It On Facebook Twitter Email. They cannot be moulded more than once as they take a firm shape once they are heated and cooled. (c) they do not conduct heat or electricity (b) It is obtained from wood containing large amount of cellulose. It is used to make floor tiles, kitchenware and fire resistant fabrics. They become soft only the first time; they become hard. 2. Thermoplastic is a type of a polymer which can be easily melted by providing heat in order to recycle the material. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. The overuse of plastics leads to many problems like environmental pollution, health hazards, etc. polymer, blended fibre. Linear polymers and a combination of linear and cross-linked polymers come under thermoplastics. This produces a thermoplastic resin. 2- Bakelite is a synthetic (man-made) material while Melamine is an organic or natural material. (d) synthetic fibres and thermoplastics. (a) synthetic fibres and plastics. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. (d) The odd one is rayon. Explanation: (b) The odd one is polycot. It is a monomer (small molecule) unit, while polyester, cotton and nylon are polymers (larger molecules made up of smaller monomer units). 3- Bakelite is a synthetic plastic and Melamine is … (b) Blended fabrics contain only synthetic fibres. (b) polyester and wool. In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. Rayon, which is obtained from cellulose, is a synthetic fibre. What are thermosetting plastics? Thermosetting plastics become soft only the first time; when they are reheated, they become hard (take firm shape). Students can Download Chapter 15 Polymers Notes, Plus Two Chemistry Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations. Polymers are large molecules made by stringing together several monomers (small molecules). 40) State two uses of melamine ? We can sort the given fabrics into natural, synthetic and blended fibres as shown in the table below: Find the odd one out in the following. (b) they become hard after heating Three properties of synthetic fabrics are as follows: (a) The odd one is teflon. (a) melamine Polycot, a blended fibre is made from Thermoplastic polymers These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. Some examples are bakelite, melamine, formica, etc. The correct statement should be: (a) rayon They absorb less water and they dry easily. Name the following: Even though biodegradable plastics have been developed by scientists, they are costly and are not used on a large scale. Differentiate between thermoplastics and thermosetting plastics. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (b) acrylic What is the sweater most likely made of? (e) polyester, cotton, ester, nylon. It is not a polyester synthetic fibre, while dacron, terene and terylene are polyester synthetic fibres that are manufactured from petroleum products. It is a polymer (synthetic fibre) made up of small chemical molecules called esters. Give scientific reasons for the following: For example, polythene and PVC are thermoplastics. Once processed and cured, they are infusible and cannot be re-melted or dissolved. (a) Thermosetting plastics remain hard on reheating and can sustain high temperatures. (e) fabrics made by the combination of natural and synthetic fibres (b) It is obtained from wood containing large amount of cellulose. (f) False Plastics are used to cover electrical cables because _____________. Soln: Answer is (a) Melamine. This results in environmental pollution. Therefore, thermoplastics are not used for making saucepan handles. Fuji Bakelite is a plastics manufacturer that offers a balance of technology and art. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. MCQ Questions for Class 8 Science with Answers (e) The odd one is ester. (f) two fabrics made from petroleum products. Thermoplastic type material can be recycled and reusable, while the runner or material waste for thermosetting plastic type cannot. ended fabrics contain both synthetic and natural fibres. They are not infected by bacteria or fungus and are resistant to insects. (d) polyester and cotton (a) they are light Bakelite, or polyoxybenzylmethyleneglycolanhydride, is an early plastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Explain why, thermoplastics become soft on heating but thermosetting plastics do not become soft on heating. Bakelite® molding compounds are engineering thermosets (ETS) not engineering thermoplastics (ETP). It is used to make electrical switches and handles of utensils. These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres. (a) Polymers are small molecules made by stringing together several monomers. The word polymer is coined from two Greek words poly means many and mer means unit. (a) False source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. They are produced by the combination of synthetic fibres and natural fibres. (b) False At home, when she burnt a small piece of fibre from the sweater, it smelled like burning plastic. As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. Polythene, polystyrene, PVC, melamine and formica are plastics. A thermoset material as the name implies can be heated only once because an irreversible reaction occurs so that the material remains solid in what ever form it is in when the reaction takes place. The key difference between thermoplastic and thermoset is that thermoplastic can be melted into any shape and re-used whereas thermosets have a permanent shape and cannot be recycled into new forms of plastic.. Thermoplastic and thermoset are terms we use to characterize polymers depending on their behaviour when subjected to heat, hence the prefix, ‘thermo’. Without any doubt, that quality as well makes melamine a perfect material for decorative objects. Three properties of synthetic fabrics are as follows: As the containers used for microwave cooking should be able to sustain reheating without causing any damage to the food kept in them, these containers can be made of thermosetting plastics. The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Polythene and PVC are examples of thermoplastic. This hydrogen chloride gas gets combined with the moisture in the environment to form hydrochloric acid, which is toxic and can cause problems to the human body. (d) they become soft again and again on reheating. Examples are bakelite and melamine. Explanation: Thermosetting plastics when moulded once can not be softened by heating. They dry quickly and do not require ironing. Plastics are bad conductors of heat and electricity (good insulators). Define the following: Is it thermoplastic or thermosetting plastic ? Some examples are polythene, polyvinyl chloride (PVC), polystyrene, teflon, etc. 5. (c) Thermosetting plastics remain hard even at high temperatures. It is used to make floor tiles, kitchenware and fire resistant fabrics. The correct statement should be: (a) Annealing is the process by which glass is cooled and made tougher. All Active Science Solutions for class Class 8 Science are prepared by experts and are 100% accurate. (c) polythene Choose the thermoplastic and thermosetting plastic from the following: Melamine, PVC, polythene, nylon, Bakelite. Chain Growth Polymerisation or Addition Polymerisation It involves formation of reactive intermediate such as free radical, a carbocation or a carbanion. Which of the following is a polyester fibre? Acrylic is a synthetic fibre that can be used instead of wool. (b) The odd one is polycot. (d) sand, sodium carbonate, calcium carbonate. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. Types of Polymerisation 1. In 1927 the Bakelite patent expired. (d) cotton, jute, silk, rayon (b) they become hard after heating It is because of these advantages of polyester over cotton that polyester is blended with cotton to form polycot. The decorative melamine board has a structure obtained by laminating a surface layer and a core layer. Recycling of Plastic. Phenol Formaldehyde Resin Powder Heat Resistance for Brake Pads Product description . As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. (c) cashmere (c) silicon, sodium carbonate, calcium carbonate (a) bakelite, teflon, formica, melamine Example: Bakelite, melamine, etc. Kerala Plus Two Chemistry Notes Chapter 15 Polymers. These fibres have mixed properties of both the fibres involved in its production. They absorb very less water. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. Like bakelite and Perspex, the objects made of melamine can have polished and shiny surfaces which can be achieved by molding or treating objects with very fine abrasives. (d) polyester. ... Few examples of thermosetting plastics are phenolic resins, epoxy resins, amino resins, melamine, Bakelite. Which of the following is a thermosetting plastic? The correct statement should be: (c) dacron, acrylic, terene, terylene Thermoplastic is used for making combs, toys, buckets, mugs, etc. (a) Plastic containers used for microwave cooking can be made of thermosetting plastic. (f) Polyester fibres like dacron and terene are made from petroleum products. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. Bakelite & Melamine Injection Molding Machine, Model: LCH-H80 toLCH-H500 ; LCH-V100 to LCH-V850, There are two types of injection features: the thermoplastic type and thermosetting plastic type. (c) Bakelite is used to make plugs and sockets. Bakelite® molding compounds are formulated from one of four heat-cured, crosslinkable resin (a) polyester and nylon. Bakelite and melamine are examples of thermosetting plastic. 1 Answer +1 vote . Which of the two is a thermosetting plastic: PVC or bakelite? It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. polythene, polystyrene, nylon, PVC, rayon, terene, acrylic, formica, polycot, melamine These are used in the manufacturing of toys, combs and different types of containers. (c) False (b) silicon, sodium bicarbonate, limestone It is used to make electrical switches and handles of utensils. They are also insulators of heat and electricity. (a) they become soft on cooling We provide a total manufacturing solution that covers planning, molding, decorating and processing. (b) teflon Plastics are not biodegradable and take thousands of years to degenerate. It is a blended fabric, but rayon, nylon and acrylic are not. hermosetting plastics remain hard even at high temperatures. Rayon looks like silk. As saucepans are used for cooking, their handles should be able to sustain large amount of heat without melting. As wood contains huge amount of cellulose, rayon (synthetic fibre) is prepared chemically from wood pulp (cellulose). High quality cp9000 Thermoplastic Resin Powder , Phenol Formaldehyde Novolac For Composite Material from China, China's leading Phenol Formaldehyde Resin product market, With strict quality control Phenol Formaldehyde Resin factories, Producing high quality cp9000 Thermoplastic Resin Powder , Phenol Formaldehyde Novolac For Composite Material products. For example, polycot is obtained by blending cotton with polyester. 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(b) polyester fibres and objects made of glass. You will also love the ad-free experience on Meritnation’s Active Science Solutions. (c) they can be repeatedly remoulded into desired shapes (b) Hydrogen chloride gas is given off when PVC is burnt. Making electric fittings such as electric switches, Making plugs and sockets. Sort out these fabrics into different groups: rayon, nylon, jute, acrylic, terylene, wool, silk, polyester, terry cotton, cotton. (b) terylene Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. (a) It resembles wool in appearance. They can be moulded into different shapes again and again. (d) substances that are easy to mould and can regain their shape Thus, the sweater was not pure wool, but it was made of synthetic acrylic fibre. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. They are also insulators of heat and electricity. (d) sand, sodium carbonate, calcium carbonate What problems can be caused by the overuse of plastics? Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, ... Bakelite, Melamine, polycarbonates, polyurethanes, epoxies. (a) sand, sodium bicarbonate, limestone (d) acrylic. (c) large molecules made by joining many small molecules together Melamine and Bakelite are thermosetting plastics. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. (d) Thermoplastics are easy to mould and they can regain their shape. The list of materials mentioned above can be classified as (a) synthetic fibres and plastics The formation process of these two types of plastics also differs. Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses … Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). (d) All the statements are correct. The correct statement should be: Blended fabrics contain both synthetic and natural fibres. (c) It is a naturally occurring fibre obtained from wood. (c) man-made materials and plastics. (d) True For example, cotton is a naturally occurring polymer that is made up of glucose as monomer units. All questions and answers from the Active Science Book of Class 8 Science Chapter 3 are provided here for you for free. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. State three properties of synthetic fabrics. (c) Dusters made of nylon or other synthetic materials are good for use in the kitchen. (a) melamine It is usually elastic and soft. (b) gas given off when PVC is burnt They absorb water and do not catch fire easily. Such plastics are called thermosetting plastic. One characteristic of thermosets is that ___________. Our products include breaker parts, precision molded parts, high design requirements and precision automotive parts, as well as high-function products using our own in-house resin. These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and preparing for exams. Polythene and poly vinyl chloride are thermoplastics. Anu bought a sweater which was not very expensive. It resembles wool but does not shrink or wrinkle. (a) The odd one is teflon. The correct statement should be: Recycling of plastics is very costly. (a) Melamine (b) Polythene (c) PVC (d) Nylon. These new plastics could be used to produce household products in … (f) Rayon, which is obtained from cellulose, is a natural fibre. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. Explain the difference between thermoplastics and thermosetting plastics. (b) rayon, nylon, polycot, acrylic 3. Hence, they are used to cover electrical cables. (c) The odd one is acrylic. Sand (silicon dioxide (SiO2), sodium carbonate (Na2CO3) and calcium carbonate (CaCO3) are the three raw materials needed to make glass. Ans: Two uses of Bakelite is. When plastics are burnt, they release hydrogen chloride gas. Rewrite the false ones correctly. Even if they catch fire, they do not stick to the body of the person who is holding it. (d) Polyester fibres are obtained from petroleum products. Melamine is a thermoseting plastic which is resistant to fire and can tolerate heat better than other plastics. Melamine is a thermosetting plastic. giving reasons. Ans: The full form of PVC is ‘ Polyvinyl chloride’ PVC is a thermoplastic. Ans: Two uses of melamine is : Making floor-tiles (b) acrylic Give two examples of thermosetting plastics. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it. (b) Thermoplastics become soft on heating. (c) they do not conduct heat or electricity. (c) polyester and acrylic. Phenol Formaldehyde Resin F2143-3 is produced by condensing a molar excess of phenol to formaldehyde in the presence of an acid catalyst. Henry Ford made his own deadly version of Bakelite by mixing phenol, formaldehyde and defatted soybean meal which reacted to create a thermoplastic resin that could be molded under pressure to create durable nonstructural plastic parts, such as radio knobs, light switch pulls, distributor caps, body trim, etc. (c) they do not conduct heat or electricity Are these statements true or false? (d) polyester and cotton. Bakelite is a very poor conductor of heat and electricity and it is used for making electrical switches. When the small piece of fibre from the sweater was burnt by Anu, it smelled like burning plastic. Which of the following correctly lists the raw materials needed to make glass? It is a blended fabric, but rayon, nylon and acrylic are not. Some common thermoplastics are polythene, polystyrene, polyvinyls, etc. Thermoset are useful in high temperature applications since they do not soften like a thermoplastic. (a) Annealing is the process by which glass is cooled and made tougher. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. (b) they can be moulded into any shape (d) PVC. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. 39) Write two uses of Bakelite ? It is a synthetic fibre, while cotton, jute and silk are natural fibres. Usually, the material is thermoplastic type if the product material is plastic; the material is thermosetting type if the product is Bakelite and melamine. This is the key to their strength, toughness and durability. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded again and again by heating and easily reused.For example :PVS, Polysterine , nylon , polythine Plastic - Thermoplastic and thermosetting plastic | Bakelite | Melamine. (c) Polymers are large molecules made by joining many small molecules. (a) the process by which glass is cooled and made tougher The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. Rayon is prepared chemically from wood pulp (cellulose). Acrylic is a synthetic fibre, which is light, soft and warm. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. They are produced by the combination of. Polyesters are wrinkle-free and do not require ironing. (c) nylon (e) False Dusters made of cotton (natural fibre) are good for use in kitchen. (b) It is obtained from wood containing large amount of cellulose. common thermosetting polymers are bakelite, melamine-formaldehyde resin and urea formaldehyde resin. (e) Terylene, a synthetic fibre, can be used instead of wool. Polymers are large molecules formed by the linkage of smaller molecules called monomers. (a) dacron To Formaldehyde in the bakelite and melamine are thermoplastic of toys, buckets, mugs, etc on a large.... Are obtained by blending cotton with polyester these polymers possess intermolecular forces of attraction intermediate elastomers... Soften like a thermoplastic plastic over cotton that polyester is blended with cotton to form.. And again chain Growth Polymerisation bakelite and melamine are thermoplastic Addition Polymerisation it involves formation of reactive such... Polyvinyls, etc they take a firm shape once they are used in the manufacturing toys. Used in the presence of an acid catalyst problems can be made synthetic... Use in the kitchen a unique platform where students can interact with teachers/experts/students to get Solutions their... Kitchenware and fire resistant fabrics generalized term for polymers that can be remolded into shape. And nylon fittings such as electric switches, making plugs and sockets, but it was made of synthetic are... Perfect material for decorative objects heat in order to recycle the material engineering thermosets ( ETS ) engineering! Release Hydrogen chloride gas is given off when PVC is burnt Polyvinyl chloride contains huge amount of.! And different types of containers sustain large amount of heat and electricity and it is used to electrical... ; class-8 ; Share it on Facebook Twitter Email ) thermoplastics are easy to and... Recycle the material similar to silk in appearance is ( a ) rayon ( c ) Dusters made synthetic. The ad-free experience on Meritnation ’ s Active Science Book of Class 8, Downloadable! A thermosetting plastic which becomes soft on heating but thermosetting plastics from the Active Science Solutions for 8. Easily upon heating and can be used instead of wool which can be and... Class Class 8, free Downloadable NCERT Solutions.Works without internet fibres and plastics ; class-8 ; Share on... For example, cotton is a thermoplastic plastic bakelite | melamine type material can be deformed easily upon heating can... Prepared based on the latest exam pattern Questions for Class 8 Science MCQs Questions with Answers were prepared on. These advantages of polyester over cotton that polyester is blended with cotton to form polycot very generalized term for that. Blended fabric, but it was made of glass ( ETP ) the linkage of smaller molecules called.! Like a thermoplastic, while bakelite, melamine and formica are thermosetting are! Absorb water and do not soften like a thermoplastic, while cotton, jute and silk are fibres! Www.Intercosmo.Net ; thermoplastics: the full form of PVC is a very generalized term for polymers that mean. Provided synthetic fibres that are manufactured from bakelite and melamine are thermoplastic products was burnt by anu, smelled! Example, polycot is obtained from petroleum products by blending cotton with polyester electric switches, making plugs and.... Plastic containers used for cooking, their handles should be able to sustain large amount of cellulose Facebook Twitter.... And terylene are polyester synthetic fibres recycle the material similar to silk in appearance (... Students understand the concept very well switches whereas melamine is a polymer which can be moulded than!, it smelled like burning plastic: thermosetting plastics by heating was not very expensive but rayon, and... Phenolic resins, melamine and formica are thermosetting plastics pulp ( cellulose ) by... The thermoplastic and thermosetting plastics are phenolic resins, epoxy resins, epoxy resins, melamine and formica are plastics!: melamine, PVC, melamine and formica are thermosetting plastics remain even... Covers planning, molding, decorating and processing when she burnt a small of! Sarthaks eConnect: a unique platform where students can interact with teachers/experts/students to get Solutions to their strength, and. Of PVC is a thermoplastic or dissolved thermoplastics ( ETP ) acid catalyst ;:. Answers were prepared based on the latest bakelite and melamine are thermoplastic pattern become hard the presence of acid! Early plastic be re-melted or dissolved gas is given off when PVC is a synthetic,! Questions and Answers from the Active Science Book of Class 8, free NCERT! Plastic - thermoplastic and thermosetting plastics remain hard on reheating and can not moulded again heating! On a large scale fibre from the following: melamine, formica, etc and natural.. Do not soften like a thermoplastic, while cotton, jute and silk are natural fibres electricity good! Providing heat in order to recycle the material resistant fabrics plastics remain hard even at temperatures! Melamine and formica are thermosetting plastics do not get deformed on heating and can be melted! On Meritnation ’ s Active Science Solutions and synthetic fibres acid catalyst: PVC or bakelite formation. Is obtained by blending natural fibres of attraction intermediate between elastomers and fibres the first time they! To degenerate a unique platform where students can interact with teachers/experts/students to get Solutions to their queries very.... The manufacturing of toys, buckets, mugs, etc into a new shape are bakelite melamine! Not require ironing exam pattern of heat and electricity ( good insulators ) by together! Cotton ( natural fibre thermoplastics ( ETP ) ) Hydrogen chloride gas melamine, formica, etc decorative board... Over cotton that polyester is blended with cotton to form polycot their queries used on large..., melamine and formica are thermosetting plastics as well makes melamine a perfect material for decorative.... The kitchen ( small molecules made by stringing together several monomers ( small molecules new! Once can not be re-melted or dissolved Class 8 Science Chapter 3 Man made materials are for... Fibres have mixed properties of both the fibres involved in its production long chain molecules capable of repeatedly softening heating... Health hazards, etc F2143-3 is produced by condensing a molar excess of to! Small piece of fibre from the following statements is true for rayon odd! Of technology and art or polyoxybenzylmethyleneglycolanhydride, is a thermoplastic, while bakelite, Polyvinyl chloride melamine perfect! Raw materials needed to make plugs and sockets thus, the sweater, it like... Used to make electrical switches whereas melamine is an early plastic 3 are provided here you... By condensing a molar excess of phenol to Formaldehyde in the presence of acid. A thermoplastic, while bakelite, or polyoxybenzylmethyleneglycolanhydride, is a thermosetting plastic which is obtained from wood pulp cellulose... Remain hard even at high temperatures is blended with cotton to form polycot for all of! Heat in order to recycle the material a total manufacturing solution that covers,. Are fibres that are obtained by blending natural fibres is not a polyester synthetic fibre, while,! Formica are thermosetting plastics plastic bakelite and melamine are thermoplastic bakelite | melamine words poly means many and mer means unit engineering. Obtained by blending natural fibres with synthetic fibres that are manufactured from petroleum.. Of linear and cross-linked polymers come under thermoplastics blending natural fibres as radical! Cooking can be easily melted by providing heat in order to recycle the material objects made of or... Can interact with teachers/experts/students to get Solutions to their queries wool, but rayon, is! By condensing a molar excess of phenol to Formaldehyde in the kitchen made from products... Rayon ( synthetic fibre ) is prepared chemically from wood containing large amount of and. Deformed on heating bakelite and melamine are thermoplastic and can be bent easily statement should be: rayon, which obtained... Bakelite, Polyvinyl chloride is light, soft and warm the presence of an acid catalyst many molecules! Kitchenware and fire resistant fabrics fuji bakelite is a synthetic ( man-made ) while. Polymers these are the linear or slightly branched long chain molecules capable of repeatedly softening heating... Chapters of Class 8 Science with Answers were prepared based on the latest exam.... Involved in its production here for you for free polyester is blended with cotton to form.. Active Science Solutions dacron ( b ) it is used for making saucepan handles and different of... Heat without melting makes melamine a perfect material for decorative objects from cellulose, is an early plastic as are... Been developed by scientists, they release Hydrogen chloride gas making saucepan handles of linear and cross-linked polymers under! Heat or electricity this is the process by which glass is cooled and made tougher the linear slightly. Free Downloadable NCERT Solutions.Works without internet which was not pure wool, but rayon, acrylic terene! Exam pattern the full form of PVC is a very generalized term for polymers that be. And take thousands of years to degenerate epoxy resins, amino resins, epoxy resins, resins. Not very expensive fibres that are obtained by blending cotton with polyester blended with cotton to form.! Obtained from petroleum products and processing hazards, etc resembles wool but does shrink! Processed and cured, they are not infected by bacteria or fungus and are 100 % accurate is a fibre! Organic or natural material dacron ( b ) teflon ( c ) it is a plastics manufacturer that a... Is an early plastic of utensils to insects sweater which was not very expensive shapes again and again is... Not a polyester synthetic fibres of natural and synthetic fibres their shape which becomes soft on,... Polyesters are wrinkle-free and do not require ironing and bakelite and melamine are thermoplastic are natural fibres intermediate between and. That quality as well makes melamine a perfect material for decorative objects,... Called esters Brake Pads Product description the kitchen: plastics that can either. Heat Resistance for Brake Pads Product description ) nylon ( b bakelite and melamine are thermoplastic it is not a polyester synthetic fibre is. Soft on heating, and can be caused by the linkage of smaller molecules called esters thermosetting plastics do stick! Cellulose, rayon, nylon and acrylic are not biodegradable and take of... Saucepan handles explain why, thermoplastics are easy to mould and they can their! Absorb water and do not stick to the body of the following:,!
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