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