The reaction is shown in the graphic on the left. (b) What are biodegradable polymers? It is an addition polymer of tetraflouroethylene.It is bad conductor of heat. What is Bakelite Plastic? Ans. Linear polymers: Polythene, Polyvinylchloride. It allows ethene molecules to join together to form a single product, so it is an example of an addition reaction. Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. An Overview of its Properties and Uses. Bakelite is an example of polymer. Ever wondered why the plastic Bakelite was used to make those bangles and chess pieces? 16: Three dimensional molecules with cross links are formed in the case of a _____ 17: Which is not polymer? The polymer is a long chain molecule which is formed by joining many small molecules called monomers. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. These polymers have many cross-linking bonds that give rise to a network-like structure. 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. together to form a 3 dimensional network polymers. Differentiate between the modes of formation of an addition polymer and a condensation polymer. A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived Here are 100 most important Multiple choice questions and answers on Polymer and Polymerization for the entrance exams. Give one example of each. During addition polymerization, the monomers rearrange themselves to form a new structure. Which is an example of thermosetting polymer? 9. Along came Bakelite – which is the first example of a truly synthetic polymer (the rest were just modifications of cellulose). Most natural polymers being employed at early stage of human society are of condensation type. Addition polymers: Polyvinyl chloride, polythene.Condensation polymers: Terylene, Bakelite. Plus Two Chemistry Polymers Three Mark Questions and Answers. Modelling addition polymers. Odd one out: choose the letter of the word that is not related from the other choices. Why bakelite is said to be an example for thermosetting polymer? (a) PMMA (b) Nylon- 6, 6 (c) Dacron (d) Bakelite. What is its use? Teflon is formed by step growth polymerisation. PVC (polyvinyl chloride), which is found in plastic wrap, simulated leather, water pipes, and garden hoses, is formed from vinyl chloride (H 2 C=CHCl). PROPERTIES:-Tensile strength; Higher tensile strength holds a greater weight before snapping. Condensation polymers are generally formed by step growth polymerisation. Notice how every other carbon must have a chlorine attached. Question 1. The monomers used are unsaturated compounds like alkenes, alkadienes and their derivatives. *Addition polymerization -The addition polymerization means that two monomers react with each other and no other small molecules are generated. iv) ... As the name suggests addition polymers form when an addition reaction occurs. SOME IMPORTANT POLYMERS NATURAL AND SYNTHETIC LIKE POLYMERS LIKE POLYSTERS, BAKELITE, RUBBER, BIODEGRABLE AND NON-BIODEGRABLE POLYMERS 1. 20: Which of the following is an addition polymer? Bakelite and melamine are examples in this category. Free Radical Polymerization: Here the addition polymer forms by addition of atoms with a … Formation of a condensation polymer, on the other hand, produces H 2 O, HCl, or some other simple molecule which escapes as a gas. Which compound form linear polymer due to H-bond? ⇒ Zeigler process produces high density polythene. Network polymers: Bakelite, Melamine. When addition polymers form, ... Styrene-butadiene rubber is an example of a a. copolymer b. natural elastomer c. natural cross linked polymer Again there are four types of addition polymerizations which are. The catalyst used in the manufacture of polythene by Ziegler method is Question 10. Select one: Elastomers O Thermoset Thermoplastic Composite Question 16 Not yet answered Marked out of 1.00 P Flag question The following figure represents Face Centered Cubic structure Select one: True O False A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Other Addition Polymers. Some examples include, bakelite and melamine formaldehyde resin. 18: Which is used in formation of nylon-66? Poly(ethene) is an addition polymer. But there is no loss of an atom or a molecule. Type Addition polymer Bakelite Monomer Phenol and Formaldehyde Type Condensation polymer Natural Rubber Monomer Isoprene Type Addition polymer. structure with tremendous rigidity. Which of the following polymer is an example of fibre [AIIMS 2000; Pb. The double bonds in monomers break and they join to form a big molecule. uses no catalyst. Question 47. Bakelite, formed from the condensation reaction of phenol with formaldehyde, became hugely popular – perhaps you have seen products with Bakelite, such as … Example: Formation of polythene from ethene. Contributors; When addition polymers are formed, no by-products result. The synthesis of first truly synthetic polymeric material, bakelite, was announced by Leo Baekeland in 1907, through a typical step-growth polymerization fashion of phenol and formaldehyde.The pioneer of synthetic polymer science, Wallace Carothers, developed a new means … Examples: Terylene, Bakelite, ... Related questions 0 votes. Which of the following represents the example of homopolymer? Answer: Bakelite is the condensation polymer of phenol and formaldehyde. These questions are likely to appear in entrance exam of MBBS, ENGINEERING , BDS, BN, BMLT, AG , BVSC and various other medical and paramedical entrance exams. All India 2013) Answer: Give one example of each of these ... Monomers combine together with the loss of molecules like H 2 O, NH 3, etc. Examples – Bakelite, melamine, etc. Familiar examples of cross-linked polymers are Bakelite, rubber, and casting (boat) resin. Give two examples of each (i) linear polymer (ii) Network polymer. Key Difference – Bakelite vs Plastic Plastic and Bakelite are both organic polymers, having a very large molecular weight though there exists a difference between the two based on their properties and usage. (A) Polystyrene (B) Nylon (C) PVC (D) Polypropylene. C) Addition polymers contain all of the atoms of the original monomers, but condensation polymers do not. Historical aspects. produces low density polythene. A common example of linear polymer. Fibers. 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