Check out a sample Q&A here. This article was most recently revised and updated by, https://www.britannica.com/science/Bakelite. The beginning of the modern plastics industry is often dated to Baekeland’s first patent application in 1907 and to the founding of his General Bakelite Company in 1910. Phenolic resins can be divided into two different types: The synthesis of bakelite starts with the reaction between formaldehyde (H 2 CO) and phenol (C 6 H 5 OH) to form a mixture of ortho- and para-substituted phenols. This question hasn't been answered yet Ask an expert . (c) Become infusible on moulding so cannot be reused. (a) Distinguish between homopolymers and copolymers. Polymers Class 12 Chemistry MCQs Pdf. Select One: O Thermoplastic O Thermoset O Elastomers O Composite; Question: Bakelite Is An Example Of Polymer. Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. Join BYJU’S or download our app to know more about polymers with the most simplified approach of learning. The introduction of Bakelite—the world’s first synthetic plastic—in 1907 marked the introduction of the Polymer Age. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Bakelite-type anionic microporous organic polymers with high capacity for selective adsorption of cationic dyes from water. Bakelite, formed from the condensation reaction of phenol with formaldehyde, became hugely popular – perhaps you have seen products with Bakelite, such as those old telephones. 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. large molecule or a macromolecule which essentially is a combination of many subunits Expert Answer . ... Bakelite; Poly carbonate . Ex:- Bakelite (used in electrical insulators), Melamine etc. Bakelite is an early polymer, comprised of a phenol-formaldehyde mixture, with Phenol being derived from coal tar, and Formaldehyde derived from methanol. These magazines are constructed of an incredibly rugged polymer material and are built to last. (iii) Crosslinked or Network polymers: In this type of polymers, monomers are linked together to form a three-dimensional network. 1. Question 1. Odd one out: choose the letter of the word that is not related from the other choices. Polyethylene, composed of repeating ethylene monomers, is an addition polymer. • This is the type of process used to make nylons and silicones. Mention the uses of polymers? Previous question Next question Transcribed Image Text from this Question. 26 Kevlar. 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 is a polymer made up of the monomers phenol and formaldehyde. Owing to the inclusion of fillers and reinforcement, Bakelite products were almost always opaque and dark-coloured. (iii) Crosslinked or Network polymers: In this type of polymers, monomers are linked together to form a three-dimensional network. Baekeland was able to stop the reaction while the resin was still in a liquid state, which he called the A stage. Many simple hydrocarbons, such as ethylene and propylene, can be transformed into polymers by adding one monomer after another to the growing chain. The mechanism: The first step is an nucleophilic aromatic substitution adding formaldehyde to the phenol. These polymers are brittle and hard. Coordination polymers may contain a range of metals in the backbone, with non-covalent bonding present. Polyester. Segment by Application, the Ceramic-Filled Thermoplastic Polymer Filament market is segmented into. The synthesis of bakelite starts with the reaction between formaldehyde (H 2 CO) and phenol (C 6 H 5 OH) to form a mixture of ortho- and para-substituted phenols. Polyethylene, composed of repeating ethylene monomers, is an addition polymer. Give an example of thermosetting polymer. 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 … A. Isotactic B. Syndiotactic C. Atactic D. Branched 12. Bakelite was commercially introduced in 1909. Students can solve NCERT Class 12 Chemistry Polymers MCQs Pdf with Answers to know their preparation level. 25 Dacron Polyester Polyamide. What is Bakelite? There are two types of Condensation polymers: 1. These intermediate condensation products are used as resins in different industries. A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. Baekeland investigated the reactions of phenol and formaldehyde has the following, the reaction! 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