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Bakelite is an early polymer, comprised of a phenol-formaldehyde mixture, with Phenol being derived from coal tar, and Formaldehyde derived from methanol. Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics). When made with this procedure, it is often an amber clear solid. Phenol formaldehyde resins (PF) or phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. The preparation of bakelite involves several steps, as illustrated below. These intermediate condensation products are used as resins in different industries. Bakelite is used for making electrical switches and switch boards. Some of the plastic structures are drawn below. Low Density Polyethylene, made from the polymerization of monomer ethylene or ethene units. This phenol-formaldehyde resin is a thermosetting polymer. In general, phenol taken in excess acts as the cross-linking agent. Answer Bakelite is a condensation polymer of phenol and formaldehyde. Bakelite is a space-network polymer. It is added to lubricants to reduce surface friction. Before it has set, the resin can be cast in a mould; once set, it is hard enough to be drilled, and does not soften again or … They are further used for protective purposes as well as in the coating industry. Question 1. Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses and applications. Unlike linear and branched polymers, which are composed of long molecules that make them more or less crystalline, space-network polymers are highly and irregularly cross-linked throughout the structure. Further, Bakelite has been used for making the handles of a variety of utensils. The Þrst synthetic thermoset polymer (a phenol-formaldehyde (PF)), known as Bakelite, was obtained in 1907 by Baekeland through the polycondensation of phenol with formaldehyde. We cannot deny the presence of polymers in our lives. The properties of Bakelite are studied to get information regarding its commercial usage. What are the Desirable Properties of Bakelite? C) The polymer has alternating double and single bonds between carbons, while the monomer has only double bonds between carbons. Bakelite was commercialized in 1909Ð1910 [3]. Bakelite is a condensation polymer of formaldehyde and phenol. CH 2 O) n. Its chemical name is “polyoxybenzylmethylenglycolanhydride”. The atomic radiusis: Find out the solubility of $Ni(OH)_2$ in 0.1 M NaOH. Common polymers and their uses are: Bakelite. Bakelite was invented in the early twentieth century but it is an important topic of study even in this 21st century. Dextron is a polyacetic acid polyglycolic acid polymer. Polymers Class 12 MCQs Questions with Answers. Bakelite is a condensation polymer of phenol and formaldehyde. 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 Bakelite is widely used for making molded products . It was used in camera making from the 1930s to the 1960s. Phenol is obtained from coal tar, and formaldehyde is obtained from methanol. (c) Become infusible on moulding so cannot be reused. Polyamide. Reaction between acetone and methyl magnesium chloride followed by hydrolysis will give : Identify the correct statements from the following: Which of the following set of molecules will have zero dipole moment ? The condensation reaction of the two reactants in a controlled acidic or basic medium results in the formation of ortho and para hydroxymethyl phenols and their derivatives. Polymers has high molecular mass. It is a thermosetting polymer and Bakelite has high strength meaning it basically retains its form even after extensive molding. LDPE. The commercial development of this PF material is … Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. 2. Your email address will not be published. For a more detailed treatment, see Bakelite. Join BYJU’S or download our app to know more about polymers with the most simplified approach of learning. Your email address will not be published. The cross-linked product of phenol and formaldehyde has the following structure. Major industrial polymers - Major industrial polymers - Phenol formaldehyde: Many people date the beginning of the modern plastics industry to 1907, when Leo Hendrik Baekeland, a Belgian-born American chemist, applied for a patent on a phenol-formaldehyde thermoset that eventually became known by the trademarked name Bakelite. Answer: Explaination: (a) and (c) e.g. The ease of molding polymers into different shapes and their relatively low cost of production has been the main reason for their universal usage. Bakelite is a thermosetting phenol formaldehyde resin, developed in 1907–1909 by Belgian chemist Dr. Leo Baekeland. 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 from coal tar and wood alcohol (methanol), respectively, at that time. Bakelite Bakelite is one of the earliest commercial plastics. 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Bakelite was particularly suitable for the emerging electrical and automobile industries because of its extraordinarily high resistance to electricity, heat, and chemical action. Bakelite B. Melamine C. Branched D. Cross-linked 10.Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11.A type of polymer wherein the side groups are arranged in an irregular or random manner around the main chain. Overview of Structure Of Bakelite. On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be: An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. Bakelite is also known as phenol formaldehyde resin and it is a type of condensation polymer. 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