Answer: (a) Thermosetting plastics. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Characteristics’ of Plastics Plastic is a poor conductor of heat and electricity. Bakelite and melamine are some examples of thermosetting plastics. EASY. b) Rayon. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. D. thermosetting polymer. Grande à réutiliser pour les projets. Polythene and PVC are examples of thermoplastic. Today life without plastics cannot be imagined. Some common examples are bakelite, urea-formaldelyde resins, etc. It is used to make floor tiles, kitchenware and fire resistant fabrics. Check Gujarat Board Released Question Banks for JEE Main. Melamine is a versatile material. Compared to bakelite, melamine is lighter and more elastic and therefore can be used with thinner objects, for example, in games and models, as well as for creating bijoux and accessories for clothes. Odd one out: choose the letter of the word that is not related from the other choices. Long-term behaviour . Some examples include, bakelite and melamine formaldehyde resin. Plastic does not react with air and water and with many of the chemicals. a) Terrycot. Answer: ... Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Question 13. We'll discuss whether it's safe to use and any risks. Bakelite and Melamine are the example of thermosetting plastic. Give examples which indicate that nylon fibres are very strong. Examples are Bakelite, melamine formaldehyde resin etc. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. Answer. Two examples are bakelite and melamine. See more. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived Plastics are light weight, durable, cheap and very strong. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. Bakelite is used for making electrical switches, handles of various utensils etc. Melamine is a versatile material and can resist fire. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. The condensation reaction of the two reactants in a controlled acidic or basic medium results in the formation of ortho and para hydroxymethyl phenols and their derivatives. b) Thermosetting plastics . Thermoplastic is used for making combs, toys, buckets, mugs, etc. These are called thermosetting plastics e.g., bakelite and melamine. These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. synthetic fibres and plastics; class-8; Share It On Facebook Twitter Email. Thermoplastic is used for making combs, toys, buckets, mugs, etc. These results relate to a few grades only and cannot be generalized. Very weak Van der waals’ forces hold the different chains of elastomers together. It resists fire and can tolerate heat better than other plastics. Articles made of thermosetting plastics Articles made of thermoplastics Fig 3.2.Some articles made of plastic 11. 9. Bakelite is an example of: A. elastomer. Polythene and PVC are examples of thermoplastic. Such plastics are called thermosetting plastic. The cure may be induced by heat, generally above 2 0 0 o C (3 9 2 F), through a chemical reaction or suitable irradiation. asked May 12, 2019 in Science by Aadam (71.9k points) Polythene and PVC are examples of . Bakelite is a poor conductor of heat and electricity. Once they are given a shape and cooled, they cannot be melted again to form a new shape. Voir que la déco caramel Convert documents to beautiful publications and share them worldwide. B. fibre. (a) Nylon (b) Rayon (c) Melamine plastic d) Silk. casein (NBS name: casein) lucite melamine formaldehyde (NBS name: amino resin) phenolic resin (NBS name: phenolic Rofecoxib (7,494 words) [view diff] exact match in snippet view article find links to article Vous achetez 4 couteaux de style art déco en bakélite manipulé bizarres. Write down their some features. It is used for making electrical switches, handles of various utensils, etc. Melamine is resistant to fire and is hence used for making utensils. d) Rayon. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Glass fibre reinforced melamine: example of modulus retention versus temperature. Classification of Polymers Based on Intermolecular Forces Elastomers . 13.Explain the uses of different types of fibres. Bakelite and melamine are examples of thermosetting plastic. Melamine is used for making floor tiles, kitchenware etc. . They also have very weak Van der Waals’ forces holding the various chains of elastomers together. Rayon is mixed with cotton to make bed sheets or mixed with wool to make carpets.2. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. Bakelite definition, a brand name for any of a series of thermosetting plastics prepared by heating phenol or cresol with formaldehyde and ammonia under pressure: used for radio cabinets, telephone receivers, electric insulators, and molded plastic ware. C. thermoplastic. Phenol formaldehyde resins (PF) or phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).They have been widely used for the production of molded products including billiard balls, laboratory countertops, and as coatings and adhesives. Good example is Catalin. Title: Grossiste pour les Hôtels, Restaurants, Cafés, Snacks, Salons, Traiteurs… Catalogue HORECA 2018, Author: Agence Kelebek Promotion, Length: 420 pages, Published: 2014-02-24 [5 MARKS] 1. Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. Melamine is resistant to fire and is hence used for making utensils. Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. b) Silk. Bakelite and melamine are examples of thermosetting plastic. Such plastics are called thermosetting plastic. These are one of the oldest polymers that were synthesized by man. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. Answer: (c) Melamine plastic. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. 10. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. c) Thermoplastics . Phenol is made to react with formaldehyde. Publishing platform for digital magazines, interactive publications and online catalogs. * Catalin and Bakelite are very similar as they are both composed of phenol and formaldehyde. * Bakelite was cast into tubes, rods and sheets, which were drilled, carved and sliced by skilled machinists. a) Thermosetting plastics. Vente de ces AS IS/AS trouvé. a) Bio degradablesubstance . These polymers have very weak intermolecular force of attraction between the polymer chains. 8 Bakelite and Melamine are examples of. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Rayon is cheaper than silk and can be woven like silk fibres. c) Nylon. (Image to be added soon) Thermoplastics; Plastics that soften upon heating and return to their original form are called thermoplastics. Plastics are non- biodegradable substances. It is a thermosetting . It can also be dyed in a wide variety of colours. Bakelite and melamine are two examples in this case. The continuous use temperatures in an unstressed state range from: • 80–150 °C for melamines • 70–100 °C for urea-formaldehydes. c) Melamine plastic. Why are the chemicals in the laboratory stored in plastic containers ? Which of the following characteristics does not affect the properties of plastics? Elastomers. On est deux tons et était probablement crème et noir ou blanc et noir (ou bleu) et les autres sont amusant et intéressant aussi bien. It has been aptly named as the ‘Material of a Thousand Uses’. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. A common example of linear polymer. Therefore, it is used for making kitchen wares and fabrics that need fire resistance. 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. Advantages of Plastic. A thermosetting plastic, also known as a thermoset, is a polymer material that irreversibly cures. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. The trademark rights for this plastic are owned by a German company called Bakelite AG, in many countries. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. bakelite type) celluloid galalith, a.k.a. They have a very weak intermolecular force of attraction among the polymer chains. Bakelite® phenolic molding compounds, when they were invented over a century ago, revolu-tionized the manufacture of household goods such as radios and lamp cases. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. b) Rayon. They can be moulded and remoulded again and again. Bakelite is one example of a thermosetting polymer. Authentic bakelite jewelry can sell for thousands of dollars, so it's important you learn how to tell the difference between genuine and imposter plastic jewelry. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. It is used to make electrical switches and handles of utensils. Bakelite and melamine are examples of thermosetting plastic. Bakelite is a poor conductor of electricity and therefore it is used for making electrical switches, handles of various utensils, etc. a) Nylon. Let us check out the various properties and uses of Bakelite. 105 views. Polythene and PVC are examples of a) Bio degradablesubstance ← Prev Question Next Question → 0 votes . Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Bakelite and melamine are examples of thermosetting plastic. co-polymer polymer .the monomer used is phenol and formaldehyde. The main difference however is that Catalin was a poured liquid and Bakelite was moulded from a granular powder. Classification of Polymers Based on Intermolecular Forces. Bakelite and melamine are the examples of thermosetting plastics. These cannot be reused. 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