(Comptt. Identify compound X in the following sequence of reactions: Identify a molecule which does not exist. For a more detailed treatment, see Bakelite. Bakelite is used for making electrical switches and switch boards. Bakelite is also known as phenol formaldehyde resin and it is a type of condensation polymer. She contributed to The Spruce for over 11 years.The Spruce Crafts uses cookies to provide you with a great user experience. Bakelite is widely used for making molded products . Examples: Nylon, terylene, Bakelite. When the phenol is taken in excess and the reaction medium is made acidic, the product of the condensation reaction obtained is acidic. When made with this procedure, it is often an amber clear solid. Classification of Elements and Periodicity in Properties, Arrange the following in increasing order of their intermolecular forces : Nylon-6,6 (I), Buna-S (II), Polythene (III), Hose pipe for delivery of petrol at a petrol pump is made up of. Answer/Explanation. The characteristics of Bakelite made it particularly suitable as a molding compound, an adhesive or binding agent, a varnish, and a protective coating. HDPE is composed of macromolecules in which n ranges from 10,000 to … Bakelite was particularly suitable for the emerging electrical and automobile industries because of its extraordinarily high resistance to electricity, heat, and chemical action. Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses and applications. The atomic radiusis: Find out the solubility of $Ni(OH)_2$ in 0.1 M NaOH. The properties of Bakelite are studied to get information regarding its commercial usage. Whereas, when the quantity of formaldehyde taken is more than that of phenol in the reacting mixture, and the reaction occurs in a basic medium, the condensation product is known as Resol. C) The polymer has alternating double and single bonds between carbons, while the monomer has only double bonds between carbons. 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 LDPE. 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. Bakelite is a condensation polymer of formaldehyde and phenol. Bakelite is an early polymer, comprised of a phenol-formaldehyde mixture, with Phenol being derived from coal tar, and Formaldehyde derived from methanol. We are surrounded by objects, most of which, some way or the other have a polymer associated with them. Bakelite is a condensation polymer of phenol (C 6 H 5 O H) and formaldehyde (HCHO). 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Further, Bakelite has been used for making the handles of a variety of utensils. Some of the plastic structures are drawn below. A polymer (/ ˈ p ɒ l ɪ m ər /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits. We cannot deny the presence of polymers in our lives. We are surrounded by objects, most of which, some way or the other have a polymer associated with them. Phenol formaldehyde resins (PF) or phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. In practice, the phenol and formaldehyde are first polymerized to a small extent by using the proper choice of catalyst and temperature. This phenol-formaldehyde resin is a thermosetting polymer. (d) Soften on heating and harden on cooling, can be reused. He first produced a soluble phenol-formaldehyde resin called “Novolak,” which never became a market success. What is Bakelite? Answer They are also resistant to several destructive solvents. Polymers Class 12 MCQs Questions with Answers. 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. It is used as friction modifier. It is one of the most common and important polymers that are used to make different parts of many objects. Your email address will not be published. Some 5,000 years ago, we learned how to make alloys of copper, and the Bronze Age began. Bakelite is first made synthetic resin which was used for commercial purposes. As such, Bakelite is one of the commercially manufactured polymers that we witness in our daily lives. 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. Since Bakelite is a manufactured, synthetic plastic containing incredible amounts of formaldehyde, asbestos and other extremely toxic polymers, those who produced these desirable products, put themselves at risk. Bakelite is a polymer made up of the monomers phenol and formaldehyde. Write the monomers of the following polymers and classify them as addition or condensation polymers : Teflon, Bakelite and Natural Rubber. Which of the following is a branched polymer, having branched chain polysaccharide units ? What are the Desirable Properties of Bakelite? Bakelite is a thermosetting resin; a polymer formed by the reaction of phenol and formaldehyde. Bakelite is a thermosetting phenol formaldehyde resin, developed in 1907–1909 by Belgian chemist Dr. Leo Baekeland. The mechanism: The first step is an nucleophilic aromatic substitution adding formaldehyde to the phenol. This phenol-formaldehyde resin is a thermosetting polymer. For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation. Phenol is made to react with formaldehyde. History is shaped by the materials we develop and use. The copolymer formed by addition polymerization of styrene and acrylonitrile in the presence of peroxide is : Which of the following statements is not true ? The monomers used are lactic acid and glycolic acid. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Bakelite is obtained from phenol and formaldehyde in the presence of either an acid or a base catalyst. For thousands of years, humans used stone to fashion tools. Bakelite is an example of (a) elastomer (b) fibre (c) thermoplastic (d) thermosetting. At the time, safety and health precautions were not mandatory. These are one of the oldest polymers that were synthesized by man. Bakelite Bakelite is one of the earliest commercial plastics. Several synthetic condensation polymers discussed include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes, epoxies. It is a thermosetting polymer and Bakelite has high strength meaning it basically retains its form even after extensive molding. Bakelite, formed from the condensation reaction of phenol with formaldehyde, became hugely popular – perhaps you have seen products with Bakelite, such as … The first synthetic polymer, a phenol-formaldehyde polymer, was introduced under the name “Bakelite Bakelite was originally used to make billiard balls. The preparation of bakelite involves several steps, as illustrated below. Bakelite moldings are heat-resistant and scratch-resistant. CH 2 O) n. Its chemical name is “polyoxybenzylmethylenglycolanhydride”. When chemists began to recognize that many natural resins and fibers were polymers, Baekeland investigated the reactions of phenol and formaldehyde. It was used in camera making from the 1930s to the 1960s. They are also called macromolecules. Overview of Structure Of Bakelite. There are two types of Condensation polymers: 1. Bakelite is a polymer made up of the monomers phenol and formaldehyde. Answer: Explaination: (a) and (c) e.g. Polymers has high molecular mass. 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. A substance which has a molecular structure built completely from a large number of similar units bonded together known as polymers. Bakelite is one of the earliest synthetic polymers. Given that the ionic product of $Ni(OH)_2$ is $2 \times 10^{-15}$. Bakelite is a condensation polymer of phenol and formaldehyde. Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. 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. Owing to its low electrical conductivity, bakelite is resistant to electric current. It is added to lubricants to reduce surface friction. All India 2013) Answer: Teflon Monomer Tetrafluoroethylene Type Addition polymer Bakelite Monomer Phenol and Formaldehyde Type Condensation polymer Natural Rubber Monomer Isoprene Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. These intermediate condensation products are used as resins in different industries. To make it stronger and to make more of it, filler such as sawdust is often added. 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