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