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