synthetic fibres and plastics; class-8; Share It On Facebook Twitter Email. Bakelite is a poor conductor of electricity and therefore it is used for making electrical switches, handles of various utensils, etc. A thermosetting plastic, also known as a thermoset, is a polymer material that irreversibly cures. Plastic does not react with air and water and with many of the chemicals. Examples are Bakelite, melamine formaldehyde resin etc. 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 Check Gujarat Board Released Question Banks for JEE Main. a) Bio degradablesubstance . 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. Some common examples are bakelite, urea-formaldelyde resins, etc. b) Silk. . Long-term behaviour . 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. Thermoplastic is used for making combs, toys, buckets, mugs, etc. Melamine is resistant to fire and is hence used for making utensils. Bakelite is one example of a thermosetting polymer. 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. 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. Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. Melamine is a versatile material. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. The trademark rights for this plastic are owned by a German company called Bakelite AG, in many countries. Bakelite and melamine are the examples of thermosetting plastics. It is used for making electrical switches, handles of various utensils, etc. 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. Phenol is made to react with formaldehyde. 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. Bakelite is used for making electrical switches, handles of various utensils etc. It is a thermosetting . Publishing platform for digital magazines, interactive publications and online catalogs. Voir que la déco caramel They also have very weak Van der Waals’ forces holding the various chains of elastomers together. Bakelite and melamine are examples of thermosetting plastic. Plastics are light weight, durable, cheap and very strong. a) Terrycot. It is used to make floor tiles, kitchenware and fire resistant fabrics. asked May 12, 2019 in Science by Aadam (71.9k points) Polythene and PVC are examples of . Therefore, it is used for making kitchen wares and fabrics that need fire resistance. B. fibre. a) Thermosetting plastics. * Catalin and Bakelite are very similar as they are both composed 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. Melamine is resistant to fire and is hence used for making utensils. Question 13. 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. Advantages of Plastic. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. * Bakelite was cast into tubes, rods and sheets, which were drilled, carved and sliced by skilled machinists. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. 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. Today life without plastics cannot be imagined. c) Nylon. Such plastics are called thermosetting plastic. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Melamine is a versatile material and can resist fire. b) Thermosetting plastics . Answer: (c) Melamine plastic. Classification of Polymers Based on Intermolecular Forces Elastomers . Bakelite is an example of: A. elastomer. Bakelite and melamine are some examples of thermosetting plastics. Plastics are non- biodegradable substances. d) Rayon. Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. It can also be dyed in a wide variety of colours. We'll discuss whether it's safe to use and any risks. 8 Bakelite and Melamine are examples of. Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. 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. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Glass fibre reinforced melamine: example of modulus retention versus temperature. 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