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