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