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