Very weak Van der waals’ forces hold the different chains of elastomers together. (Image to be added soon) Thermoplastics; Plastics that soften upon heating and return to their original form are called thermoplastics. Write down their some features. bakelite type) celluloid galalith, a.k.a. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. 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 Convert documents to beautiful publications and share them worldwide. See more. 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. Plastics are non- biodegradable substances. Polythene and PVC are examples of thermoplastic. a) Bio degradablesubstance . Voir que la déco caramel Give examples which indicate that nylon fibres are very strong. Thermoplastic is used for making combs, toys, buckets, mugs, etc. synthetic fibres and plastics; class-8; Share It On Facebook Twitter Email. 8 Bakelite and Melamine are examples of. d) Rayon. a) Nylon. 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. Title: Grossiste pour les Hôtels, Restaurants, Cafés, Snacks, Salons, Traiteurs… Catalogue HORECA 2018, Author: Agence Kelebek Promotion, Length: 420 pages, Published: 2014-02-24 b) Thermosetting plastics . A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Plastic does not react with air and water and with many of the chemicals. Odd one out: choose the letter of the word that is not related from the other choices. Bakelite and melamine are examples of thermosetting plastic. Why are the chemicals in the laboratory stored in plastic containers ? 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. We'll discuss whether it's safe to use and any risks. It has been aptly named as the ‘Material of a Thousand Uses’. Therefore, it is used for making kitchen wares and fabrics that need fire resistance. Bakelite and melamine are the examples of thermosetting plastics. These cannot be reused. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. * Catalin and Bakelite are very similar as they are both composed of phenol and formaldehyde. Thermoplastic is used for making combs, toys, buckets, mugs, etc. Once they are given a shape and cooled, they cannot be melted again to form a new shape. Melamine is used for making floor tiles, kitchenware etc. Today life without plastics cannot be imagined. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. Which of the following characteristics does not affect the properties of plastics? Examples are Bakelite, melamine formaldehyde resin etc. (a) Nylon (b) Rayon (c) Melamine plastic d) Silk. 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. The main difference however is that Catalin was a poured liquid and Bakelite was moulded from a granular powder. These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. Long-term behaviour . * Bakelite was cast into tubes, rods and sheets, which were drilled, carved and sliced by skilled machinists. Such plastics are called thermosetting plastic. Good example is Catalin. Classification of Polymers Based on Intermolecular Forces 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. Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. They also have very weak Van der Waals’ forces holding the various chains of elastomers together. It resists fire and can tolerate heat better than other plastics. It can also be dyed in a wide variety of colours. Advantages of Plastic. Bakelite is one example of a thermosetting polymer. Polythene and PVC are examples of thermoplastic. b) Rayon. The trademark rights for this plastic are owned by a German company called Bakelite AG, in many countries. b) Rayon. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. It is a thermosetting . Answer: (c) Melamine plastic. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Two examples are bakelite and melamine. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. These results relate to a few grades only and cannot be generalized. Grande à réutiliser pour les projets. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. It is used to make floor tiles, kitchenware and fire resistant fabrics. 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