Give two examples of each (i) linear polymer (ii) Network polymer. The best example is polymerization of ethylene. iv) ... As the name suggests addition polymers form when an addition reaction occurs. Addition polymers are generally formed by chain growth polymerisation. Examples: Terylene, Bakelite, ... Related questions 0 votes. Question 11. Most natural polymers being employed at early stage of human society are of condensation type. 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. Other Addition Polymers. The first semisynthetic polymer was actually made from a natural polymer. Which of the following is not an example of addition polymer ? (Comptt. An Overview of its Properties and Uses. C) Urea-formaldehyde resin done clear. They have a very strong intermolecular force. A) Both addition polymers and condensation polymers contain all of the atoms of the monomers. It is a phenol formaldehyde resin, formed from condensation reaction of phenol and formaldehyde Bakelite, formed from the condensation reaction of phenol with formaldehyde, became hugely popular – perhaps you have seen products with Bakelite, such as … Again there are four types of addition polymerizations which are. Polymer obtained by condensation polymerization is 1) Polythene 2) Teflon 3) Phenol-formaldehyde 4) Nitrile rubber 2. Question 47. 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. Network polymers: Bakelite, Melamine. In addition polymerisation, the molecules of the same monomer add together on a large scale to form a polymer. Give one example of each. These included other types of cast phenolic resins similar to Catalin , and urea-formaldehyde resins, which could be made in brighter colors than polyoxybenzylmethyleneglycolanhydride. Along came Bakelite – which is the first example of a truly synthetic polymer (the rest were just modifications of cellulose). What is bakelite? USES: It is used as a material resistant to heat and chemical attack in household works. 20: Which of the following is an addition polymer? A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Formation of a condensation polymer, on the other hand, produces H 2 O, HCl, or some other simple molecule which escapes as a gas. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Some examples include, bakelite and melamine formaldehyde resin. 1 answer. Which of the following is an addition polymer . The double bonds in monomers break and they join to form a big molecule. Poly(ethene) is an addition polymer. Bakelite and melamine are examples in this category. A familiar example of a condensation polymer is nylon, which is obtained from the reaction of two monomers. During addition polymerization, the monomers rearrange themselves to form a new structure. Question 10. 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. Example: Formation of polythene from ethene. Check Answer and Solution for abov Addition Polymerization: Example, poly ethane, Teflon, Polyvinyl chloride (PVC) Familiar examples of cross-linked polymers are Bakelite, rubber, and casting (boat) resin. When addition polymers form, ... Styrene-butadiene rubber is an example of a a. copolymer b. natural elastomer c. natural cross linked polymer (b) What are biodegradable polymers? Solution: Bakelite is a thermosetting polymer. Some common examples are Proteins (which are found in humans and animals alike), ... thermosetting polymer is that of Bakelite, which is used in making electrical insulation. (a) Distinguish between homopolymers and copolymers. Addition polymers: Polyvinyl chloride, polythene.Condensation polymers: Terylene, Bakelite. Which compound form linear polymer due to H-bond? The synthesis of bakelite starts with the reaction between formaldehyde (H 2 CO) and phenol (C 6 H 5 OH) to form a mixture of ortho- and para-substituted phenols. structure with tremendous rigidity. B) Both addition polymers and condensation polymers lose some atoms from the original monomers when the polymer is formed. 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). Bakelite is formed by step growth polymerisation. Here are 100 most important Multiple choice questions and answers on Polymer and Polymerization for the entrance exams. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. -It requires two like molecules. Odd one out: choose the letter of the word that is not related from the other choices. A) Glucose done clear. Type Addition polymer Bakelite Monomer Phenol and Formaldehyde Type Condensation polymer Natural Rubber Monomer Isoprene Type Addition polymer. But there is no loss of an atom or a molecule. The reaction is shown in the graphic on the left. The catalyst used in the manufacture of polythene by Ziegler method is Which of the following represents the example of homopolymer? These polymers have many cross-linking bonds that give rise to a network-like structure. 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 … Differentiate between the modes of formation of an addition polymer and a condensation polymer. (A) Polystyrene (B) Nylon (C) PVC (D) Polypropylene. Linear polymers: Polythene, Polyvinylchloride. Bakelite done clear. Polymers can also be classified on the basis of mode of polymerisation into two sub groups. Ans. Other Ways to Classify Polymers Classification Based on Polymerization. An example is vulcanized rubber. Plus Two Chemistry Polymers Three Mark Questions and Answers. The first truly synthetic plastic was bakelite, developed by Leo Baekland between 1905 and 1914. EXAMPLES-Bakelite,formaldehyde etc. What is its use? Ever wondered why the plastic Bakelite was used to make those bangles and chess pieces? SOME IMPORTANT POLYMERS NATURAL AND SYNTHETIC LIKE POLYMERS LIKE POLYSTERS, BAKELITE, RUBBER, BIODEGRABLE AND NON-BIODEGRABLE POLYMERS 1. It is because of the unique properties it possesses. It allows ethene molecules to join together to form a single product, so it is an example of an addition reaction. A common example of linear polymer. It is further classified into, Teflon is formed by step growth polymerisation. together to form a 3 dimensional network polymers. Why bakelite is said to be an example for thermosetting polymer? Addition Polymers The addition polymers formed by the polymerisation of a single monomeric species are known as homopolymers. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Free Radical Polymerization: Here the addition polymer forms by addition of atoms with a … C) Addition polymers contain all of the atoms of the original monomers, but condensation polymers do not. The polymer is a long chain molecule which is formed by joining many small molecules called monomers. Addition and condensation polymers can exist with a cross-linked network, depending on the monomers used in the synthesis. produces low density polythene. These polymers contain bi-functional and tri-functional monomers and strong covalent bonds between various linear polymer chains. They have a stronger covalent bond in comparison to other linear polymers. 16: Three dimensional molecules with cross links are formed in the case of a _____ 17: Which is not polymer? It is used for … It is an addition polymer of tetraflouroethylene.It is bad conductor of heat. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. A. Bakelite B. Melamine C. Branched D. Cross-linked 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 *Addition polymerization -The addition polymerization means that two monomers react with each other and no other small molecules are generated. Which is an example of thermosetting polymer? The monomers used are unsaturated compounds like alkenes, alkadienes and their derivatives. Notice how every other carbon must have a chlorine attached. Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. Question 1. ⇒ Zeigler process produces high density polythene. (a) PMMA (b) Nylon- 6, 6 (c) Dacron (d) Bakelite. Bakelite is an example of polymer. 19: Which of the following has ester linkage? Contributors; When addition polymers are formed, no by-products result. Historical aspects. 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 They are very rigid, hard, and brittle. They are composed of bifunctional and trifunctional monomers. Give one example. The process can be … In addition to the original Bakelite material, these companies eventually made a wide range of other products, many of which were marketed under the brand name "Bakelite plastics". 1) Polythene 2) PVC CET 2001] A) Silk done clear. Presented here are the properties and other uses of Bakelite you should know about. Modelling addition polymers. Answer: Bakelite is the condensation polymer of phenol and formaldehyde. PROPERTIES:-Tensile strength; Higher tensile strength holds a greater weight before snapping. All India 2013) Answer: Examples of such polymers include bakelite and melmac. What is Bakelite Plastic? Which of the following polymer is an example of fibre [AIIMS 2000; Pb. 18: Which is used in formation of nylon-66? Examples – Bakelite, melamine, etc. Give one example of each of these ... Monomers combine together with the loss of molecules like H 2 O, NH 3, etc. uses no catalyst. 9. 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