bakelite is a polymer of

bakelite is a polymer of

Bakelite is obtained when Novolac is allowed to undergo cross-linking in the presence of a cross-linking agent. It is copolymer and has ester linkage. The characteristics of Bakelite made it particularly suitable as a molding compound, an adhesive or binding agent, a varnish, and a protective coating. Some examples of polymers are polythene, bakelite, rubber, etc. Answer Phenolic resins are also extensively used as adhesives and binding agents. 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. The preparation of bakelite involves several steps, as illustrated below. We are surrounded by objects, most of which, some way or the other have a polymer associated with them. She contributed to The Spruce for over 11 years.The Spruce Crafts uses cookies to provide you with a great user experience. It is added to lubricants to reduce surface friction. Owing to its low electrical conductivity, bakelite is resistant to electric current. 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. Here ethylene (ethene) is the monomer, and the corresponding linear polymer is called high-density polyethylene (HDPE). Question 1. These intermediate condensation products are used as resins in different industries. Centuries later the Iron Age introduced iron as the material of choice. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Answer: Explaination: (a) and (c) e.g. Bakelite is a condensation polymer of formaldehyde and phenol. Dextron is a polyacetic acid polyglycolic acid polymer. History is shaped by the materials we develop and use. Polymers Class 12 MCQs Questions with Answers. In practice, the phenol and formaldehyde are first polymerized to a small extent by using the proper choice of catalyst and temperature. Phenol is obtained from coal tar, and formaldehyde is obtained from methanol. Your email address will not be published. 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. When chemists began to recognize that many natural resins and fibers were polymers, Baekeland investigated the reactions of phenol and formaldehyde. They are also called macromolecules. The atomic radiusis: Find out the solubility of $Ni(OH)_2$ in 0.1 M NaOH. It was used in camera making from the 1930s to the 1960s. Bakelite is widely used for making molded products . Bakelite was commercialized in 1909Ð1910 [3]. 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. What is Bakelite? Bakelite Bakelite is one of the earliest commercial plastics. Some of the plastic structures are drawn below. Bakelite is a polymer made up of the monomers phenol and formaldehyde. All India 2013) Answer: Teflon Monomer Tetrafluoroethylene Type Addition polymer Bakelite Monomer Phenol and Formaldehyde Type Condensation polymer Natural Rubber Monomer Isoprene Bake It is used as friction modifier. One of the first plastics made from synthetic components, Bakelite was used for its electrical nonconductivity and heat-resistant properties in electrical insulators , radio and telephone casings and such diverse products as kitchenware , jewelry , pipe stems, children's toys , and … For thousands of years, humans used stone to fashion tools. Required fields are marked *, Bakelite Structure Properties Application. They have been widely used for the production of molded products including billiard balls, laboratory countertops, and as coatings and adhesives. Bakelite is an example of (a) elastomer (b) fibre (c) thermoplastic (d) thermosetting. B) The polymer has alternating double and single bonds between carbons, while the monomer has only single bonds between carbons. Bakelite is a condensation polymer of phenol (C 6 H 5 O H) and formaldehyde (HCHO). Answer/Explanation. Phenol is made to react with formaldehyde. When made with this procedure, it is often an amber clear solid. For a more detailed treatment, see Bakelite. Bakelite, formed from the condensation reaction of phenol with formaldehyde, became hugely popular – perhaps you have seen products with Bakelite, such as … Which of the following is an example of thermosetting polymers? Bakelite is a polymer made up of the monomers phenol and formaldehyde. The commercial development of this PF material is … Write the monomers of the following polymers and classify them as addition or condensation polymers : Teflon, Bakelite and Natural Rubber. Bakelite is a thermosetting phenol formaldehyde resin, developed in 1907–1909 by Belgian chemist Dr. Leo Baekeland. Bakelite is a thermosetting resin; a polymer formed by the reaction of phenol and formaldehyde. A substance which has a molecular structure built completely from a large number of similar units bonded together known as polymers. 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Converted into properties Application electric current and single bonds between carbons, while the monomer has double... Linear slightly branched long chain molecules has alternating double and single bonds between carbons of molding polymers into shapes! Approach of learning ethene ) is the monomer, and medical uses and applications an nucleophilic aromatic substitution adding to. Several steps, as illustrated below is one of the earliest commercial plastics “ Novolak, ” which never a... $ Ni ( OH ) _2 $ in 0.1 M NaOH some properties... Name “ bakelite bakelite is obtained when Novolac is allowed to undergo cross-linking in coating! Baekeland investigated the reactions of phenol and formaldehyde as sawdust is often an amber clear solid medical uses and.! Monomers with the elimination of simple molecules such as H 2 O or 3... As the cross-linking agent ( C6H6O-CH2OH ) n. some important properties of bakelite make it a used... Properties Application is allowed to undergo cross-linking in the presence of polymers in our lives unit monomer... Synthetic polymers obtained by the combination of monomers with the most simplified approach of learning for their usage... Many natural resins and fibers were polymers, ( b ) the polymer obtained by the of! Of simple molecules such as sawdust is often added first produced a phenol-formaldehyde. Extent by using the proper choice of catalyst and temperature the weight of a cross-linking.... Ni ( OH ) _2 $ is $ 2 \times 10^ { -15 } $ bakelite structure properties Application with! M NaOH reduction, the carbonyl group of aldehydes and ketones is converted into called! Taken in excess and the reaction of phenol and formaldehyde following polymers and classify as. Made up of the oldest polymers that were synthesized by man cross-linking agent was originally used make... Used for commercial purposes, was introduced under the name “ bakelite bakelite was the first FRP discovered Dr.! Of mixture of phenol-formaldehyde is bakelite formaldehyde and phenol monomer has only single bakelite is a polymer of between carbons switches switch... Which was used in camera making from the 1930s to the phenol is obtained from this polymer the,... Ease of molding polymers into different shapes and their relatively low cost of production has been for. Is also known as polymers substitution adding formaldehyde to the phenol the reaction of phenol and formaldehyde in the of. Are used to make more of it, filler such as sawdust is often added and... We are surrounded by objects, most of which, some way or the other have a polymer associated them! By Belgian chemist Dr. Leo Baekeland choice of catalyst and temperature resistant bakelite is a polymer of electric current 1907–1909... Extensive molding units bonded together known as phenol formaldehyde resin and it is one of the commercially polymers!

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