Overview of Structure Of Bakelite. Bakelite was only available in a limited range of colours. Soft bakelites with low degree of polymerisation are used as bonding glue for laminated wooden planks, in the preparation of-varnishes and lacquers . An early compound that is made of mixture of phenol-formaldehyde is Bakelite. Polytetrafluroethylene (PTFE): Polytetrafluroethylene is also known as Teflon. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. It is the 21st century and we literally live in the world of plastics. Music for body and spirit - Meditation music Recommended for you Text Solution. The colorful bangles, earrings and bracelets were widely used. This thermosetting plastic created a revolution in the world of product design. Artificial jewelry made of metals or some other alloys may sometimes result into allergies or skin irritation, but carefully manufactured Bakelite jewelry are cent percent safe to wear which gave it an added advantage in the market. The dielectric constant of Bakelite falls in the range of 4.4 to 5.4.  It can be easily molded and hence is used in the making of various products. Proper preparation of metallographic specimens is a key step to determine the accurate microstructure of a material and often requires sectioning, mounting, course grinding, fine grinding, polishing, etching and microscopic examination. 2,234,548, of March 11, 1941, for Phenolic resins. Bakelite is a space-network polymer. For comparison, the nanocomposite sample is side-by-side compared with the corresponding simple blend of Bakelite polymer and RNP (physical mixing of RNP with Bakelite during its preparation). Studying the properties of Bakelite will give us a wider idea as to why it is used for a wide range of applications. It has been aptly named as the ‘Material of a Thousand Uses’. This is why they are used to make a number of electronic gadgets, switches and automobile parts. Formation of Novalac from ortho hydroxy benzyl alcohol. In total 13 questions, 2 questions are Multiple Choice form, 3 questions are TRUE-FALSE-NOT GIVEN form, 5 questions are Plan, map, diagram labelling form, 3 questions are Summary, form completion form. This project requires some amount of precaution but the outcome is rewarding.A polymer is a macromolecule composed of repeating structural units connected by covalent bonds.  It is liquefiable and malleable when heated and becomes permanently hard and rigid on cooling. I would like to know the percentage of phenol and formaldehyde for making bakelite. … It is a thermosetting phenol-formaldehyde resin formed by the condensation reaction of phenol with formaldehyde. It is usually brown/amber but can be made in a variety of bright colors. As we now know the Bakelite preparation method as well as its structure, let us now have a look at the properties of Bakelite. The Bakelite preparation can be demonstrated in the following steps of reactions-. The introduction of Bakelitethe worlds first synthetic plasticin 1907 marked the introduction of the Polymer Age. The method is designed to produce bakelite varnish LB-SP, representing mainly alcohol solution rezol formaldehyde resin obtained by condensing phenol with formaldehyde in the presence of dead-burned magnesia or magnesium oxide as a catalyst. There were several reasons for the research into plastics in the nineteenth century, among them the great advances that had been made in the field of 3 and the search for … Watch all CBSE Class 5 to 12 Video Lectures here. Bakelite was invented in the early twentieth century but it is an important topic of study even in this 21st century. In sequence, the steps include sectioning, mounting, course grinding, fine ... Bakelite is a low cost, relatively hard thermosetting polymer that is commonly utilized. Increase Brain Power, Focus Music, Reduce Anxiety, Binaural and Isochronic Beats - Duration: 3:16:57. Bakelite Bakelite is one of the earliest commercial plastics. The properties of Bakelite are studied to get information regarding its commercial usage. Raw materials used in the preparation of bakelite are :-phenol and formaldehyde. Phenol is obtained from coal tar, and formaldehyde is obtained from methanol. D. Condensation and elimination. Pro Lite, Vedantu The mechanism: The first step is an nucleophilic aromatic substitution adding formaldehyde to the phenol. Bakelite is a thermosetting resin—that is, once molded, it retains its shape even if heated or subjected to various solvents. Bakelite is a plastic that is used for making many products, ranging from telephones, electrical gadgets, jewelry, to saucepan handles. When made with this procedure, it is often an amber clear solid. The reaction involved is condensation reaction in the presence of either a basic or acidic catalyst. Warm the viscous lower layer in a hot water bath and while thoroughly mixing, add acetic acid until the product turns clear, then add a little more. (1) Condensation and elimination (2) Electrophilic addition and dehydration (3) Electrophilic substitution and … Vedantu academic counsellor will be calling you shortly for your Online Counselling session. 3.0k SHARES.  The ability to be molded makes it a part of the commodities being used in modern life. Glacial Acetic acid: Harmful: Dilute acetic acid, in the form of vinegar, is harmless. Phenol is obtained from coal tar, and formaldehyde is obtained from methanol. Fully mix phenolic resin with sawnwood powder, talc (filler), urotropine (curing agent), stearic acid (lubricant), pigment, etc., and heat and knead in the mixer to obtain bakelite powder. E.g., PVC. The plastic furniture at homes, offices and schools, the electric sockets, plugs, devices, buckets- everything has become an essential part of human life. Share Tweet Share Pin it... of potassium, sodium, calcium, strontium and barium are more reactive than magnesium oxide and magnesium hydroxide.  Bakelite is the commercial name for phenol formaldehyde resin. Watch all CBSE Class 5 to 12 Video Lectures here. anon124253 November 5, 2010 . Bakelite was immediately welcomed as a practical and versatile material. Preparation of Bakelite Unlike linear and branched polymers (see demonstration 25.2), 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. Uses of Bakelite : (i) It is used for making electrical switches and plugs. [6] When phenol (C 6 H 6 O), which is an organic compound [1] and a common disinfectant [3] , is mixed with formaldehyde (CH 2 O) in the presence of an alkali catalyst and heat [2] … Also, the reaction should be conducted under pressure, otherwise the product formed will be brittle and a low density material. Modern day plastic preparation is based on the same principles as that patented 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. Although Bakelite was definitely a remarkable invention that paved the way to the Economics & subject. & Business subject stronger solutions is dangerous to human and animal life number of electronic gadgets switches. 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