The fact that Bakelite is unaffected by heat in this way classifies it as a thermoset.[5]. Some of the reinforcing fillers like wood flour, pulp of cotton, mica, gypsum, asbestos are added to resins of molding such as Bakelite. Besides fillers, the curing process could be accelerated by catalyst. ( Log Out /  Glacial Acetic acid: Harmful: Dilute acetic acid, in the form of vinegar, is harmless. It is a thermosetting phenol-formaldehyde resin formed by the condensation reaction of phenol with formaldehyde.

Bakelite is an early polymer, comprised of a phenol-formaldehyde mixture, with Phenol being derived from coal tar, and Formaldehyde derived from methanol. Structure of Bakelite Report ; Posted by Utpal Nath 1 year ago. Several patterns were made in 1942, but steel was used instead in 1943 and recycled shell casings in 1944 and 1945. A condensation polymerization reaction of phenol and formaldehyde results in the formation of Bakelite. (2016). [1], Image: https://en.wikipedia.org/wiki/Phenol_formaldehyde_resin. This content has been hidden. It can also be made into different colours, but this depends on filler that it is mixed with during the manufacturing process. Change ), You are commenting using your Twitter account. To enhance the strength and properties of Bakelite, fillers are employed so that Bakelite could be used for several applications. For thousands of years, humans used stone to fashion tools. It could also be used as binding agents and adhesives. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. They are also called macromolecules. Build flawless & robust structure of bakelite strong as an ox with aid of leading steel giants. Date: 28-09-10. Bakelite is a Polymer made up of the Monomers Phenol and Formaldehyde. In the structure of Bakelite, the phenol and formaldehyde are cross-linked. Change ), You are commenting using your Google account. Write the names of the monomers of the following polymers: (a) Bakelite (b) Nylon - 6,6
It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. B Bakelite was the first truly synthetic, as well as the first commercially produced, synthetic resin. The resin in stage A can also be cured by itself for a long time. A condensation polymerization reaction of phenol and formaldehyde results in the formation of Bakelite. So, it is known as thermosetting plastic. bakelite structure. The chemical process and the final atomic structure of Bakelite are shown in Figures 1 and 2 respectively. What to learn next based on college curriculum. Because of its high resistance towards heat and electricity, it is used to manufacture in several electronic instruments, parts of automobile, and switches. After this final setting of the material it will not be possible to heat and reshape it again. Bakelite has chemical formula of (C6H6O−CH2OH)n{\left( {{{\rm{C}}_{\rm{6}}}{{\rm{H}}_{\rm{6}}}{\rm{O - C}}{{\rm{H}}_{\rm{2}}}{\rm{OH}}} \right)_{\rm{n}}}(C6​H6​O−CH2​OH)n​. Bakelite is easy to identify because it has a slick-looking patina to the inner part of the bangle or on the back part of a brooch or piece. Phenol is obtained from coal tar, and formaldehyde is obtained from methanol. Today, objects made from Bakelite are considered highly collectible, although in its glory days of the 1930s and 1940s, it was seen as an inexpensive alternative to high-end jewelry materials such as jade and pearl. ( Log Out /  It appears as brown colour whereas it could be made in different types of colors that are bright. Bakelite or polyoxybenzylmethylenglycolanhydride was the first plastic made from synthetic components. 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. If it gives off a formaldehyde smell, it is Bakelite. [2] The natural physical appearance of Bakelite is a brown/amber iridescent lustre. File:3-D Structure of Bakelite.png. [online] Available at: Wikipedia. The presence of hydroxyl group attached to aromatic benzene ring is phenol and CH2{\rm{C}}{{\rm{H}}_{\rm{2}}}CH2​ linked to the phenols indicates the presence of formaldehyde. Change ), NT Conradie - 19673418 ( Log Out /  The systematic name of bakelite is polyoxybenzylmethylenglycolanhydride. Structured data. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our … [2] The new mixture is then forced into heated moulds under high pressure. Bakelite is abrand named material based on the thermosetting phenol formaldehyde resin polyoxybenzylmethylenglycolanhydride, developed in 1907–1909 by Dr. Leo Baekeland. © 2003-2020 Chegg Inc. All rights reserved. (2016). To get to the History of Bakelite we must travel back in time to the year 1907 when a Belgian-born chemist, Leo Bakeland came up with a process of combining Phenol with formaldehyde resin. A substance which has a molecular structure built completely from a large number of similar units bonded together known as polymers. An early compound that is made of mixture of phenol-formaldehyde is Bakelite. Water and steam are then drawn off as the mixture cools, and a viscous brown resin remains. One or more users have flagged this content as inappropriate. Polymers has high molecular mass. However, ingestion of stronger solutions is dangerous to human and animal life. Once hard, it is crushed into a powder, which is then mixed with various fillers. Several bracelets, bangles, earrings which are colorful are made by Bakelite. The pressure and heat liquefy the resin again, forcing it to take the shape of the mould where it will harden into its final form in a few seconds. A synthetic resin that is made from synthetic substances is Bakelite. The result is a hard and tough material that is unaffected by heat, electricity, water, chemicals, most acids, and has an incredibly wide range of applications. Curing is process which leads in the toughening of polymers and hardening of polymers by producing chains of cross-linked polymers. Bakelite is an early plastic, created in 1907. 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 deforms permanently and retains its shape after being heated and moulded. (2008). From Wikimedia Commons, the free media repository. Bakeland was looking for a replacement for shellac. Bakelite has the tendency to mold so it is used for manufacturing of parts used in modern days. Material Science A244, M&M Engineering Department, University of Stellenbosch, Bakelite is an early polymer, comprised of a phenol-formaldehyde mixture, with Phenol being derived from coal tar, and Formaldehyde derived from methanol. English. Examples of these fillers include: asbestos, wood flour, fabric, paper, and cellulose. They have excellent electrical insulating character. Its chemical name is phenolic. Phenol formaldehyde resins (PF) or phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).They have been widely used for the production of molded products including billiard balls, laboratory countertops, and as coatings and adhesives. On cooling, it turns out to be rigid and hard permanently. Run the piece under hot tap water. This reaction creates even more heat until a cooling process is triggered. Bakelite | chemical compound. The monomers that are required in the formation of Bakelite are formaldehyde and phenol. Bakelite was the first FRP discovered by Dr. Baekeland. We cannot deny the presence of polymers in our lives. Maneet Singh 5 months, 1 week ago. [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. This resin is then poured into containers and is left to harden. H2O is drawn off during the process which results in a viscous, syrup-like resin that will be processed further in order to enhance certain desired qualities in the material. A combination of formaldehyde and phenol leads to Bakelite. Captions. (2016). Bakelite could be readily molded, and therefore, it could be used in producing different products. Posted on September 30, 2020 by . The steps of reaction involved in the formation of Bakelite are. This is the chemical structure of Bakelite. Because Bakelite is easily shaped it is used in many different ways and in many different shapes and sizes. Value of Old Plastic Jewelry . Explore Alibaba.com for structure of bakelite that meet all quality expectations. [6] Bakelite was the first truly synthetic, as well as the first commercially produced, synthetic resin. However, they are attacked by alkalies due to the presence of free hydroxyl groups in their structure. Well as the first FRP discovered by Dr. Leo Baekeland appears as brown colour whereas it could be used producing. Undergoes cross linking to form Bakelite not be possible to heat and reshape it again with the. 2 respectively on Commons ; File history ; File usage on Commons ; history. 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