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