[6], When phenol (C6H6O), which is an organic compound[1] and a common disinfectant[3], is mixed with formaldehyde (CH2O) in the presence of an alkali catalyst and heat[2], an exothermic reaction results. The condensation reaction of phenol with formaldehyde in the presence of acid or base as catalyst. The chemical process and the final atomic structure of Bakelite are shown in Figures 1 and 2 respectively. Some of the reinforcing fillers like wood flour, pulp of cotton, mica, gypsum, asbestos are added to resins of molding such as Bakelite. A condensation polymerization reaction of phenol and formaldehyde results in the formation of Bakelite. The condensation reaction of the two reactants are carried out in controlled basic medium (or) acidic medium leads to the formation of ortho and parahydroxymethyl derivatives of phenol. Inventors and inventions.
It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. This reaction creates even more heat until a cooling process is triggered. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. It contains phenol, formaldehyde and a wood flour filler. We are surrounded by objects, most of which, some way or … Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. Bakelite’s characteristics include having low electrical conductivity and high heat and chemical resistance. Its structure is made up of extensively cross-linked chains, which stop the chains from unfolding. History is shaped by the materials we develop and use. Il peut être peint dans des couleurs différentes. The dangerous nature of Bakelite is from different sources: manufacturing, collecting and disposing. Muhammad Usman (2008-chem-02-B) Properties of required chemicals: 1. Bakelite | chemical compound. One or more users have flagged this content as inappropriate. These desired properties include: better mouldability, greater toughness and strength, and greater heat-, water-, chemical-, and shock-resistance. Bakelite is a Polymer made up of the Monomers Phenol and Formaldehyde. Because Bakelite is easily shaped it is used in many different ways and in many different shapes and sizes. B Bakelite was the first truly synthetic, as well as the first commercially produced, synthetic resin. They have excellent electrical insulating character. The systematic name of bakelite is polyoxybenzylmethylenglycolanhydride. What to learn next based on college curriculum. Let us check out the various properties and uses of Bakelite. Bakelite is an early plastic, created in 1907. Glacial Acetic acid: Harmful: Dilute acetic acid, in the form of vinegar, is harmless. In mounting of samples of metal in metallography, Bakelite are used. [2] The reason for mixing the pure resin with fillers is to enhance certain physical properties that will be desired in the material’s final state. It is an example of thermosetting resin of phenol and formaldehyde. The trademark rights for this plastic are owned by a German company called Bakelite AG, in many countries. Polymers. Maneet Singh 5 months, 1 week ago. Bakelite is abrand named material based on the thermosetting phenol formaldehyde resin polyoxybenzylmethylenglycolanhydride, developed in 1907–1909 by Dr. Leo Baekeland. Change ), You are commenting using your Facebook account. It is a thermosetting phenol-formaldehyde resin formed by the condensation reaction of phenol with formaldehyde. Bakelite is made up of Phenol and formaldehyde. Bakelite is a polymer made up of the monomers phenol and formaldehyde. Bakelite could be made into several colors, because of its ability to make into several colors. Bakelite can also be tested using the “hot water” method. The condensation reaction of formation of Bakelite is extremely exothermic (or) a water molecule is lost for the cooling process. Shellac is made from the excretion of Kerria Lacca insects (lac bugs). ( Log Out /  Bakelite is derived by the polymerization of formaldehyde and phenol. And Novolac on heating with formaldehyde undergoes cross linking to form Bakelite. (2016). The most readily found colors are yellow, ranging from butter yellow to dark butterscotch, followed by various shades of green. Change ), You are commenting using your Twitter account. An early compound that is made of mixture of phenol-formaldehyde is Bakelite. Mark describes the structure of Bakelite and how the links between molecules mean that it will not melt at higher temperatures (like celluloid did before it). 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. Write the names of the monomers of the following polymers: (a) Bakelite (b) Nylon - 6,6 The monomers that are required in the formation of Bakelite are formaldehyde and phenol. They are also called macromolecules. In the initial process of synthesizing, Bakelite involves in the phenol and formaldehyde heating in the presence of catalysts such as hydrochloric acid, ammonia, and zinc chloride. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. Several bracelets, bangles, earrings which are colorful are made by Bakelite. So, we can, in general, say that Bakelite is a condensation polymer or a phenolic resin. Captions. 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