Recycling of plastic is very important. Example: Bakelite, melamine, etc. Composites are made by mixing materials together to get enhanced properties. Bisphenal A (BPA) 0 Thank You. _____ are used to identify different types of plastics. It is made from melamine and formaldehyde by condensation of the two monomers. It is used to make floor tiles, kitchenware and fire resistant fabrics. 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. b) Rayon. Write the monomers used for gettingThe following polymers: (i) Polyvinylchloride (ii) Teflon (iii) Bakelite Ans: 15.13. Some examples include, nylon, cellulose, wool, terylene, and silk. Bakelite and melamine are the examples of … 27 g water-thinnable phenolic resol resin (from Bakelite); 3 g water-thinnable melamine resin … Cellulose is a polysaccharide, a polymer that is composed of sugar molecules. A) PVC B) Bakelite C) Melamine D) Polythene 5. Fibers. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Give examples which indicate that nylon fibres are very strong. ISC Chemistry Previous Year Question Paper 2019 Solved for Class 12 Maximum Marks: 70 Time allowed: 3 hours Candidates are allowed additional 15 minutes for only reading the paper. c) Melamine plastic. 3] Based on Mode of Polymerisation. 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 … Examples … d) Silk 10 The coating on modern non- stick cookware and electric iron is of. William Reusch, … Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses and applications. Bakelite and melamine are examples of thermosetting plastic. 36.4.1 Phenol–melamine–formaldehyde resins. 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. Choose the correct answer: The synthetic plastic used for making insulation cover in electrical wires and cables is . Bakelite is a poor conductor of heat and electricity. Good examples are melamine (kitchen worktops), Bakelite (black saucepan handles), polyester and epoxy resins. Melamine is a versatile material. It is used in making plastic toys. The first gepletely manmade plastic was discovered in 1907 by Leo Baekeland, called Bakelite. Yogita Ingle 4 months ago. Ex:- Bakelite (used in electrical insulators), Melamine etc. a) Terrycot. The formation process of these two types of plastics also differs. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. These polymers are brittle and hard. These polymers have tensile strength, less elasticity, high melting point, and low solubility. Hence, option C is correct. Melamine is resistant to fire and is hence used for making utensils. c) Nylon. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. The market value is extremely high, due to the retro feel and limited quantities of certain products. Why is it hazardous? Bakelite is used for making electrical switches, handles of various utensils etc. 15.12. Examples – Bakelite, melamine, etc. Phenol–melamine–formaldehyde resins (PMF-resins) show, in some respects, better properties than the corresponding MF- and PF-condensates. Epoxy resin plus carbon fibre is … This document is highly rated by UPSC students and has been viewed 1 times. Which of the following characteristics does not affect the properties of plastics? 59, 69, 70 … Melamine and Bakelite are two examples of thermoplastics. Polymerization is the process by which monomer molecules are reacted together in a chemical reaction to form a polymer chain (or three-dimensional networks). A _____ is a long chain made up of many repeated small units called monomers. a) Nylon. Polyester resin is mixed with glass fibre to make GRP used for boatbuilding and fishing rods. 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. Since Bakelite is a … It is used in making bottles. b) Silk. Recycling of Plastic. Melamine definition: a colourless crystalline compound used in making synthetic resins ;... | Meaning, pronunciation, translations and examples A) cellulose B) starch C) Both A and B D) silk … Dimensional stability, surface hardness and … Choose the correct answer: Natural polymer occurring in plant is . examples are bakelite and melamine. How does the … Question 13. The plastic industry gained momentum, slowly moving into the homes … It is used for making electrical switches, handles of various utensils, etc. Melamine is used for making floor tiles, kitchenware etc. Suryansh Singh 4 months ago. Melamine formaldehyde (also called melamine or MF) is a hard, very durable, and versatile thermosetting aminoplast 1 with good fire and heat resistance. a) Thermosetting plastics. Another reason for application of cocondensates is their price; for example, UF-resins are cheaper than MF- or PF-resins. The fully natural fibreis called _____ A natural fibre obtained by boiling of cocoons is called _____ Answer: Raincoat; Resin codes; polymer; plant … Melamine is a compound used in some plastic products, such as dishes, utensils, and more. It is used for packaging many goods like container etc. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Examples: Polythene, Polyvinyl Chlorides, etc. For example, glycerol [5], isocyanate [6] as well as substituted melamine [7] had been added into MF resin to improve its flexibility. These include cellulose, lignin, and various resins. Dec 21, 2020 - NCERT Gist: Synthetic Fibres and Plastics UPSC Notes | EduRev is made by best teachers of UPSC. For example: Bakelite and melamine. Another familiar isoprene polymer … EXAMPLE 3. They stand up well in most plating baths and alkaline cleaners, … Examples are bakelite, melamine-foimaldehyde polymer etc. Wood resins are polymers of a simple hydrocarbon, isoprene. 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. Write the name and structure of one of the common initiators used in free radical addition polymerisation. Based on the type of … Ans: Thermoplastics is a plastic which can be … Why are the chemicals in the laboratory stored in plastic containers ? Melamine and bakelite are the examples thermosetting plastic. These new plastics could be … Long-term behaviour . Question 1 is of 20 marks having four subparts, all of … Color Highlighted Text Notes; Please Sign In to create your own … Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds. For example, Bakelite jewelry is more rare than, say, dishes or cookware. They are held together through hydrogen bonds and/or dipole- dipole attraction.. _____ is an example of polyester fabric. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Contributors and Attributions. Melamine-Formaldehyde Resins Properties. As we all know, emulsifier can reduce the interfacial tension and increase the contact area between foaming agent and MF resin which is benefit to foaming. Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. The first plastic was invented in 1862 derived from Cellulose, a substance found in plants. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help … Thermoplastic Polymers… EXAMPLE 2. Examples include polyesters, e.g. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some … Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Answer: ... Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. A) Bakelite B) Melamine C) Teflon D) None of these 4. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. 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. We'll discuss whether it's safe to use and any risks. Its good fire retardant properties are due to … All questions are compulsory. These results relate to a few grades only and cannot be generalized. Ans: 15.14. Examples – Bakelite, melamine, etc. It is used to make electrical switches and handles of utensils. 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. But different kinds of emulsifiers had dif … … Uses. Thermosetting plastics are having highly branched chain molecules with extensive cross linking and if heated becomes infusible and cannot be reused. These resins are resistant to the atmosphere and chemical corrosion, have fairly light weight, low heat conductivity, high structural strength and excellent electrical insulation. Typical UL … Question: What is the … Some examples include, bakelite and melamine formaldehyde resin. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Lignin consists of a complicated three-dimensional network of polymers. It is … source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. They must NOT start writing during this time. Examples … Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. 0 Thank You. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Notes/Highlights. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. polyethyleneterephthalate: n ... Bakelite, Melamine, polycarbonates, polyurethanes, epoxies. 30) Why are thermoplastics not used for making frying pan handles ? It resists fire and can tolerate Glass fibre reinforced melamine: example of modulus retention versus temperature. For example: melamine, Bakelite etc. Bakelite, Resinox and Durez are examples of phenolic resins of the molding type. For example, the solid parts of all plants are made up of polymers. For example: Bakelite, formaldehyde polymer, glyptal, melamine-formaldehyde polymer. The dangerous nature of Bakelite is from different sources: manufacturing, collecting and disposing. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. 8 Bakelite and Melamine are examples of. Based on the mode of polymerisation, it is classified into I. b) … Answered By The continuous use temperatures in an unstressed state range from: • 80–150 °C for melamines • 70–100 °C for urea-formaldehydes. They have a very strong intermolecular force. 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