bakelite is an example of which polymer

Polymer obtained by condensation polymerization is 1) Polythene 2) Teflon 3) Phenol-formaldehyde 4) Nitrile rubber 2. A. Isotactic B. Syndiotactic C. Atactic D. Branched 12. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. Polymers Class 12 MCQs Questions with Answers. [10], Baekeland started semi-commercial production of his new material in his home laboratory, marketing it as a material for electrical insulators. ... Dextron is a polyacetic acid polyglycolic acid polymer. Natural polymers (also called biopolymers) include silk, rubber, cellulose, wool, amber, keratin, collagen, starch, DNA, and shellac. Hence, they can be modified again and again. Made in labs. What is Bakelite? Question 25. Wood, rubber, cotton, wool, leather, and silk are examples of: naturally occurring polymers derived from plants and animals. Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. [16] The article emphasized that Bakelite came in various forms. Which of the following represents the example of homopolymer? [7]:58–59 Baekeland considered the possibilities of using a wide variety of filling materials, including cotton, powdered bronze, and slate dust, but was most successful with wood and asbestos fibers. Also, because of the smooth polished surface that resulted, Bakelite objects required less finishing. Once Baekeland's heat and pressure patents expired in 1927, Bakelite Corporation faced serious competition from other companies. As the sales figures also show, the Bakelite Company produced "transparent" cast resin (which did not include filler) for a small ongoing market during the 1910s and 1920s. Answer: Bakelite is the condensation polymer of phenol and formaldehyde. [40] Designer Coco Chanel included Bakelite bracelets in her costume jewelry collections. [13] Under director of advertising and public relations Allan Brown, who came to Bakelite from Condensite, Bakelite was aggressively marketed as "the material of a thousand uses". Baekeland's innovative step was to put his "last condensation product" into an egg-shaped "Bakelizer". Answer Baekeland's initial intent was to find a replacement for shellac, a material in limited supply because it was made naturally from the excretion of lac insects (specifically Kerria lacca). [7]:44–45[22][25], Phenolic resin products may swell slightly under conditions of extreme humidity or perpetual dampness. These include cellulose, lignin, and various resins. 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. For example, the solid parts of all plants are made up of polymers. The creation of a synthetic plastic was revolutionary 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 firearms. Baekeland produced a soluble phenol-formaldehyde shellac called "Novolak", but it was not a market success. By heating it under pressure, at about 150 °C (300 °F), Baekeland was able to suppress the foaming that would otherwise occur. Your email address will not be published. Example : Bakelite, Melamine etc. In 1939, the companies were acquired by Union Carbide and Carbon Corporation. Answer: Explaination: (a) and (c) e.g. [44] Bakelite was also used to make presentation boxes for Breitling watches. [5][6] It was the first synthetic thermosetting plastic produced, and Baekeland speculated on "the thousand and one ... articles" it could be used to make. Question 5. Answer/Explanation. Good mechanical and electrical strength. What is a Bio-degardable polymer? [61], By the late 1940s, newer materials were superseding Bakelite in many areas. "[14]:17 In a 1925 report, the United States Tariff Commission hailed the commercial manufacture of synthetic phenolic resin as "distinctly an American achievement", and noted that "the publication of figures, however, would be a virtual disclosure of the production of an individual company".[17]. ; lacquers, for protecting the surface of hardware; enamels, for giving resistive coating to industrial equipment; Laminated Bakelite, used for silent gears and insulation; and molding material, from which are formed innumerable articles of utility and beauty. [7], Baekeland filed a substantial number of patents in the area. Phenol is made to react with formaldehyde. Glyptal. Bakelite and other non-metal materials were tested for usage for the one cent coin in the US before the Mint settled on zinc-coated steel. Sustained heating results in an "insoluble hard gum". The range of colors available included "black, brown, red, yellow, green, gray, blue, and blends of two or more of these". Bakelite (/ˈbeɪkəlaɪt/ BAY-kə-lyte; sometimes spelled Baekelite) or polyoxybenzylmethylenglycolanhydride was the first plastic made from synthetic components. large molecule or a macromolecule which essentially is a combination of many subunits When made with this procedure, it is often an amber clear solid. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. During World War II, Bakelite was used in a variety of wartime equipment including pilot's goggles and field telephones. Bakelite is an example of polymer. iv) Fibres: [7]:58–59[14] A filing for a trademark featuring the letter B above the mathematical symbol for infinity was made August 25, 1925, and claimed the mark was in use as of December 1, 1924. It is copolymer and has ester linkage. Contributors; When addition polymers are formed, no by-products result. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. It was developed by the Belgian-American chemist Leo Baekeland in Yonkers, New York, in 1907. [3], Bakelite was designated a National Historic Chemical Landmark on November 9, 1993, by the American Chemical Society in recognition of its significance as the world's first synthetic plastic. The molding material is prepared ordinarily by the impregnation of cellulose substances with the initial 'uncured' resin. Examples of natural condensation polymers include cellulose, starch, and polypeptide chains of proteins. In 2005, Union Carbide's phenolic resin business, including the Bakelite and Bakelit registered trademarks, were assigned to Hexion Inc. On the 1st of April, 2019 Hexion filed for Chapter 11 bankruptcy. [38] It was soon found in myriad other consumer products ranging from pipe stems and buttons to saxophone mouthpieces, cameras, early machine guns, and appliance casings. Bakelite was also very commonly used in making molded grip panels (stocks) on handguns, submachine guns and machineguns, as well as numerous knife handles and "scales" through the first half of the 20th century.[39]. Log in, Concise Mathematics Class 10 ICSE Solutions 2018. Pot handles, telephones, outlets. [66], Oc0ccccc0Cc0cc(C1)c(O)c(c0)Cc0c(O)ccc(c0)Cc0ccc(O)c(c0)Cc0c(O)ccc(c0)Cc0c(O)ccc(c0)Cc0c(O)c(C2)cc(c0)Cc0c(O)ccc(c0)Cc(c0O)cc2cc0Cc0cc(Cc2ccc(O)cc2)c(O)c(c0)Cc0c(O)ccc(c0)C1, Except where otherwise noted, data are given for materials in their, Baekeland, Leo H (December 7, 1909) "Method of making insoluble products of phenol and formaldehyde", United States Patent and Trademark Office, "Bakelite: The World's First Synthetic Plastic", "Leo Baekeland's Transatlantic Struggle for Bakelite: Patenting Inside and Outside of America", "The Fourth Kingdom: The Social Construction of Bakelite", "Micarta ® Laminates – Various Grades Technical Information", "Bakelite The material of a thousand uses (Advertisement)", "Organization and Activities of Engineering Division of the Army Air Service", "Manufacturers' Monthly Material of the Month part 1: Bakelite", "Once Touted As 'Kitchen Jewelry', Bakelite Flatware Is Making A Comeback", "Home Front Friday: Bakelite for the Fight", Evasion and Escape Devices: Produced by MI9, MIS-X and SOE in World War II, "Bakelite and catalin: Collectible early plastics", "Catalin: The Crown Jewel Of Table Radios", "Crystalate Gramophone Record Manufacturing Co., Ltd.", "The Synthesis, Constitution, and Uses of Bakelite", Bakelite: The Material of a Thousand Uses, Virtual Bakelite Museum of Ghent 1907–2007, https://en.wikipedia.org/w/index.php?title=Bakelite&oldid=995785150, Articles with dead external links from October 2019, Articles with permanently dead external links, Short description is different from Wikidata, Chemicals that do not have a ChemSpider ID assigned, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Wikipedia articles needing clarification from July 2019, Creative Commons Attribution-ShareAlike License. In England, Bakelite Limited, a merger of three British phenol formaldehyde resin suppliers (Damard Lacquer Company Limited of Birmingham, Mouldensite Limited of Darley Dale and Redmanol Chemical Products Company of London), was formed in 1926. Cellulose is a polysaccharide, a polymer that is composed of sugar molecules. Heated further, the product becomes partially soluble and can still be softened by heat. Condensation polymers are formed by the combination of monomers with the elimination of simple molecules such as H 2 O or CH 3 OH. Bakelite, trademark of phenol-formaldehyde resin, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. The catalyst used in the manufacture of polythene by Ziegler method is MI9 was forced to adapt to meet the challenge of a number of different compass solutions were devised, both covert and overt. In recent years the "retro" appeal of old Bakelite products has made them collectible. Bakelite was particularly suitable for the emerging electrical and automobile industries because of its extraordinarily high resistance to electricity, heat, and chemical action. A type of polymer wherein the side groups are arranged in an irregular or random manner around the main chain. However, the high temperatures required to create this tends to cause violent foaming of the mixture when done at standard atmospheric pressure, which results in the cooled material being porous and breakable. Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. Items such as billiard balls, dominoes and pieces for board games such as chess, checkers, and backgammon are constructed of Bakelite for its look, durability, fine polish, weight, and sound. [9] He announced his invention at a meeting of the American Chemical Society on February 5, 1909. Bakelite is a condensation polymer of phenol and formaldehyde. Polymers MCQs: MCQs test on 'Polymers' with answers, Test: 1, Total Questions: 15 ... Nylon-66 is an example of elastomer. This reaction is irreversible in nature. Bijker gives a detailed discussion of the development of Bakelite and the Bakelite company's production of various applications of materials. Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. Question 1: Write the names and structures of the monomers of the following polymers: (i) Nylon-6,6 (ii) Bakelite (iii) Polystyrene Answer: Question 2: Write the names and structures of the monomers of the following polymers: (i) Glyptal (ii) Teflon (iii)Nylon-6 Answer: Question 3: Write the name and structures of the monomers of the following polymers: (i) Buna-S (ii) Glyptal (iii) Polyvinyl chloride Answer: Question 4: Write the names and structures of the monomers of the following polymers: (i) Nylon-6 (ii) Novolac (iii)B… Fully synthetic polymers include: Bakelite, the first synthetic plastic Neoprene (a manufactured form of rubber) Nylon, polyester, rayon (manufactured forms of silk) [7]:116–117[36][37] It was also very important to the developing automobile industry. ... Bakelite, Kevlar, and vulcanized rubber are also thermoset plastics. [7] In 1927, beads, bangles and earrings were produced by the Catalin company, through a different process which enabled them to introduce 15 new colors. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. natural rubber. It is not flexible. Along came Bakelite – which is the first example of a truly synthetic polymer (the rest were just modifications of cellulose). The polymer is formed by condensation of formaldehyde with phenol. SOME IMPORTANT POLYMERS NATURAL AND SYNTHETIC LIKE POLYMERS LIKE POLYSTERS, BAKELITE, RUBBER, BIODEGRABLE AND NON-BIODEGRABLE POLYMERS 1. [23], Bakelite phenolic sheet is produced in many commercial grades and with various additives to meet diverse mechanical, electrical and thermal requirements. Polypeptide chains of proteins melamine, polycarbonates, polyurethanes, epoxies Jerry Byrd loved the tone Bakelite. 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