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