They have a very weak intermolecular force of attraction among the polymer chains. These are called thermosetting plastics e.g., bakelite and melamine. These cannot be reused. (a) Nylon (b) Rayon (c) Melamine plastic d) Silk. c) Melamine plastic. 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. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. 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. Rayon is cheaper than silk and can be woven like silk fibres. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Answer: (c) Melamine plastic. Answer. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. 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. Polythene and PVC are examples of a) Bio degradablesubstance ← Prev Question Next Question → 0 votes . Which of the following characteristics does not affect the properties of plastics? * Catalin and Bakelite are very similar as they are both composed of phenol and formaldehyde. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. Phenol is made to react with formaldehyde. It resists fire and can tolerate heat better than other plastics. c) Nylon. The trademark rights for this plastic are owned by a German company called Bakelite AG, in many countries. Therefore, it is used for making kitchen wares and fabrics that need fire resistance. bakelite type) celluloid galalith, a.k.a. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. 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. 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. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Today life without plastics cannot be imagined. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. B. fibre. Bakelite and melamine are the examples of thermosetting plastics. 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. co-polymer polymer .the monomer used is phenol and formaldehyde. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Grande à réutiliser pour les projets. Characteristics’ of Plastics Plastic is a poor conductor of heat and electricity. Two examples are bakelite and melamine. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Bakelite is a poor conductor of heat and electricity. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and These are one of the oldest polymers that were synthesized by man. Write down their some features. Bakelite and melamine are examples of thermosetting plastic. Bakelite is one example of a thermosetting polymer. Some examples include, bakelite and melamine formaldehyde resin. It has been aptly named as the ‘Material of a Thousand Uses’. Why are the chemicals in the laboratory stored in plastic containers ? [5 MARKS] 1. Answer: (a) Thermosetting plastics. Once they are given a shape and cooled, they cannot be melted again to form a new shape. Bakelite and melamine are two examples in this case. 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. Question 13. a) Terrycot. b) Thermosetting plastics . These results relate to a few grades only and cannot be generalized. Classification of Polymers Based on Intermolecular Forces Elastomers . 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. Thermoplastic is used for making combs, toys, buckets, mugs, etc. C. thermoplastic. c) Thermoplastics . Melamine is resistant to fire and is hence used for making utensils. It can also be dyed in a wide variety of colours. These polymers have very weak intermolecular force of attraction between the polymer chains. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. Advantages of Plastic. Plastic does not react with air and water and with many of the chemicals. d) Rayon. It is a thermosetting . Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. a) Thermosetting plastics. Examples are Bakelite, melamine formaldehyde resin etc. b) Rayon. Rayon is mixed with cotton to make bed sheets or mixed with wool to make carpets.2. It is used for making electrical switches, handles of various utensils, etc. Publishing platform for digital magazines, interactive publications and online catalogs. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. a) Bio degradablesubstance . 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. Bakelite is an example of: A. elastomer. 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. 105 views. Some common examples are bakelite, urea-formaldelyde resins, etc. Melamine is resistant to fire and is hence used for making utensils. Give examples which indicate that nylon fibres are very strong. synthetic fibres and plastics; class-8; Share It On Facebook Twitter Email. Bakelite and melamine are examples of thermosetting plastic. Classification of Polymers Based on Intermolecular Forces. Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. Vous achetez 4 couteaux de style art déco en bakélite manipulé bizarres. Thermoplastic is used for making combs, toys, buckets, mugs, etc. Very weak Van der waals’ forces hold the different chains of elastomers together. Long-term behaviour . Bakelite and melamine are some examples of thermosetting plastics. Good example is Catalin. Voir que la déco caramel Bakelite is used for making electrical switches, handles of various utensils etc. 13.Explain the uses of different types of fibres. It is used to make floor tiles, kitchenware and fire resistant fabrics. 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 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 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. Polythene and PVC are examples of thermoplastic. These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. a) 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. Melamine is used for making floor tiles, kitchenware etc. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. A common example of linear polymer. Let us check out the various properties and uses of Bakelite. Articles made of thermosetting plastics Articles made of thermoplastics Fig 3.2.Some articles made of plastic 11. Such plastics are called thermosetting plastic. Check Gujarat Board Released Question Banks for JEE Main. asked May 12, 2019 in Science by Aadam (71.9k points) Polythene and PVC are examples of . 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. Melamine is a versatile material. 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. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Melamine is a versatile material and can resist fire. 9. The main difference however is that Catalin was a poured liquid and Bakelite was moulded from a granular powder. Elastomers. 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. They can be moulded and remoulded again and again. They also have very weak Van der Waals’ forces holding the various chains of elastomers together. We'll discuss whether it's safe to use and any risks. Such plastics are called thermosetting plastic. Vente de ces AS IS/AS trouvé. 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. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. . EASY. * Bakelite was cast into tubes, rods and sheets, which were drilled, carved and sliced by skilled machinists. Title: Grossiste pour les Hôtels, Restaurants, Cafés, Snacks, Salons, Traiteurs… Catalogue HORECA 2018, Author: Agence Kelebek Promotion, Length: 420 pages, Published: 2014-02-24 Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. Bakelite and melamine are examples of thermosetting plastic. b) Rayon. A thermosetting plastic, also known as a thermoset, is a polymer material that irreversibly cures. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. Bakelite and Melamine are the example of thermosetting plastic. b) Silk. Answer: ... Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. D. thermosetting polymer. 10. Plastics are light weight, durable, cheap and very strong. See more. Polythene and PVC are examples of thermoplastic. Convert documents to beautiful publications and share them worldwide. The continuous use temperatures in an unstressed state range from: • 80–150 °C for melamines • 70–100 °C for urea-formaldehydes. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. Glass fibre reinforced melamine: example of modulus retention versus temperature. 8 Bakelite and Melamine are examples of. 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