Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. They stand up well in most plating baths and alkaline cleaners, … 36.4.1 Phenol–melamine–formaldehyde resins. Phenol–melamine–formaldehyde resins (PMF-resins) show, in some respects, better properties than the corresponding MF- and PF-condensates. Question 1 is of 20 marks having four subparts, all of … The fully natural fibreis called _____ A natural fibre obtained by boiling of cocoons is called _____ Answer: Raincoat; Resin codes; polymer; plant … c) Nylon. Based on the mode of polymerisation, it is classified into I. Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. Bisphenal A (BPA) 0 Thank You. Thermosetting plastics are having highly branched chain molecules with extensive cross linking and if heated becomes infusible and cannot be reused. b) Rayon. It is … Bakelite and melamine are the examples of … For example, the solid parts of all plants are made up of polymers. William Reusch, … The first gepletely manmade plastic was discovered in 1907 by Leo Baekeland, called Bakelite. These polymers are brittle and hard. _____ are used to identify different types of plastics. Thermoplastic Polymers… Contributors and Attributions. Yogita Ingle 4 months ago. Based on the mode of polymerisation, it is classified into; Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds. A) Bakelite B) Melamine C) Teflon D) None of these 4. It is used in making bottles. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it. examples are bakelite and melamine. Examples: Polythene, Polyvinyl Chlorides, etc. Melamine is resistant to fire and is hence used for making utensils. For example, Bakelite jewelry is more rare than, say, dishes or cookware. Polyester resin is mixed with glass fibre to make GRP used for boatbuilding and fishing rods. Good examples are melamine (kitchen worktops), Bakelite (black saucepan handles), polyester and epoxy resins. Which of the following characteristics does not affect the properties of plastics? Why are the chemicals in the laboratory stored in plastic containers ? Answered By They are held together through hydrogen bonds and/or dipole- dipole attraction.. Since Bakelite is a … The plastic industry gained momentum, slowly moving into the homes … Bakelite is used for making electrical switches, handles of various utensils etc. Melamine is a versatile material. EXAMPLE 2. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. Typical UL … 3] Based on Mode of Polymerisation. Fibers. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. EXAMPLE 3. It resists fire and can tolerate Wood resins are polymers of a simple hydrocarbon, isoprene. Suryansh Singh 4 months ago. Bakelite is a poor conductor of heat and electricity. Ans: Thermoplastics is a plastic which can be … Notes/Highlights. Write the monomers used for gettingThe following polymers: (i) Polyvinylchloride (ii) Teflon (iii) Bakelite Ans: 15.13. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Bakelite; Melamine; Two example of each type of plastics are given below : Polythene – making polythene bags, bottles etc, Polyvinyl chloride – making electric wires, pipes, garden hoses etc. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Another familiar isoprene polymer … Some examples include, bakelite and melamine formaldehyde resin. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help … a) Thermosetting plastics. Cellulose is a polysaccharide, a polymer that is composed of sugar molecules. 6.3 Examples of Common Defect Types 7 Disclaimer / Resources 8 Product Overview Title: Ford 1.0 I3 MMLV ... [EP], unsaturated polyester [UP], melamine phenolic [MP] and phenolic [PF] resins allow products to be mass produced in an infinite variety of contours and forms. The first plastic was invented in 1862 derived from Cellulose, a substance found in plants. Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds. Bakelite and melamine are examples of thermosetting plastic. 27 g water-thinnable phenolic resol resin (from Bakelite); 3 g water-thinnable melamine resin … Hence, option C is correct. Examples are bakelite, melamine-foimaldehyde polymer etc. Example: Bakelite, melamine, etc. a) Nylon. _____ is an example of polyester fabric. a) Terrycot. Melamine is used for making floor tiles, kitchenware etc. These new plastics could be … Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some … But different kinds of emulsifiers had dif … b) … These results relate to a few grades only and cannot be generalized. These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. For example: Bakelite, formaldehyde polymer, glyptal, melamine-formaldehyde polymer. These include cellulose, lignin, and various resins. It is used to make electrical switches and handles of utensils. Question 13. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. This document is highly rated by UPSC students and has been viewed 1 times. Ex:- Bakelite (used in electrical insulators), Melamine etc. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. It is made from melamine and formaldehyde by condensation of the two monomers. Melamine formaldehyde (also called melamine or MF) is a hard, very durable, and versatile thermosetting aminoplast 1 with good fire and heat resistance. If they are not recycled at the proper time, then they get mixed with other chemicals or materials and hence become more difficult to recycle and … 18 g water-thinnable phenolic resol resin (from Bakelite); 2 g water-thinnable melamine resin (from Vianova); 2 g 1,2-octanediol; 5 g 1,2-hexanediol; 1 g zinc glycerophosphate; is made up to 100 g with water. 59, 69, 70 … All questions are compulsory. c) Melamine plastic. Melamine definition: a colourless crystalline compound used in making synthetic resins ;... | Meaning, pronunciation, translations and examples Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Composites are made by mixing materials together to get enhanced properties. 8 Bakelite and Melamine are examples of. Dec 21, 2020 - NCERT Gist: Synthetic Fibres and Plastics UPSC Notes | EduRev is made by best teachers of UPSC. In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. Choose the correct answer: The synthetic plastic used for making insulation cover in electrical wires and cables is . Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). Uses. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Melamine and Bakelite are two examples of thermoplastics. Give examples which indicate that nylon fibres are very strong. Epoxy resin plus carbon fibre is … Another reason for application of cocondensates is their price; for example, UF-resins are cheaper than MF- or PF-resins. … Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. Examples … Bakelite is used for making electrical switches whereas melamine is used for floor tiles. Lignin consists of a complicated three-dimensional network of polymers. For example: Bakelite and melamine. The formation process of these two types of plastics also differs. It is used for packaging many goods like container etc. They have a very strong intermolecular force. Recycling of plastic is very important. A) cellulose B) starch C) Both A and B D) silk … Ans: 15.14. Examples … It is used for making electrical switches, handles of various utensils, etc. The market value is extremely high, due to the retro feel and limited quantities of certain products. The continuous use temperatures in an unstressed state range from: • 80–150 °C for melamines • 70–100 °C for urea-formaldehydes. Recycling of Plastic. How does the … Melamine-Formaldehyde Resins Properties. Some examples include, nylon, cellulose, wool, terylene, and silk. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. For example: melamine, Bakelite etc. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Bakelite B ) Bakelite B ) … examples: Polythene, Polyvinyl melamine and bakelite examples, etc Thermoplastics not used for many... Ncert MCQ melamine and bakelite examples for Class 12 Chemistry Chapter 15 polymers with Answers were prepared on... With Answers were prepared based on the latest exam pattern strength, less,... 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