They are highly cross - linked, hard, infusible and insoluble polymers.They cannot be reused. Thermosetting polymers Cross linked or heavily branched molecules, / on heating undergo extensive cross linking in moulds and again become infusible. (iii) Cross-linked Polymers: These are polymers in which monomer units are cross- linked together to form a three-dimensional net work. Once set into a new solid cannot be remelted. Each formaldehyde can react with two phenols and each phenol can react with three formaldehydes. Adjacent linear chains are connected with interlinked chains. It is a highly cross-linked polymer formed from the acid-catalyzed polymerization of phenol and formaldehyde. Example - pvc. Thermosetting plastics are normally made up of lines of polymers which are highly cross-linked. which of the following is an example of thermosetting polymer . synthetic polymer, a cross-linked phenolic resin that was later named Bakelite.1 Unlike plastics that flow when heated, known as thermoplastics, Bakelite does not flow at elevated temper-atures and is therefore classified as a thermoset. B. bakelite . C. ... Teflon is polymer of tetraflouroethylene. Rubber is an example of an elastomer type polymer, where the polymer has the ability to return to its original shape after being stretched or deformed. Cross linking increases with heating. Thermosetting Polymers. Figure 29-2: Schematic representation of the conversion of an uncross-linked thermosetting polymer to a highly cross-linked polymer. These are cross linked polymer. Q. Eg: Bakelite. 2. Other Ways to Classify Polymers Classification Based on Polymerization These polymers are hard, rigid and brittle because of network structure. Option A is correct. Exam style Questions. This phenomenon, of the reversible cross- For example, Low-density polythene. (an example is EPON Bakelite is an example of thermosetting polymer.. 1. A natural resinous polymer called lignin has a cross-linked structure similar to bakelite. Bakelite, a durable plastic used for the casing of early radios and TVs, was the first of the thermosetting polymers. Example: phenol formaldehyde resin, melamine-formaldehyde resin etc. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. What do the chemical properties of a polymer depend on? Pot handles, telephones, outlets. Tags: Question 8 . 3. Teflon-thermally stable cross linked polymer of phenol and formaldehyde . Cross-linked Polymers. Cross-linked or Network polymers: These polymers have many cross-linking bonds that give rise to a network-like structure. Some common examples are bakelite… Examples of such polymers include bakelite … These are shown in Fig (c) . Q. The bakelite is made from phenol and formaldehye. Comb Polymer: These are polymers containing comb macromolecules.This means these polymers contain side chains on the … Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. It is a highly cross-linked polymer formed from the acid-catalyzed polymerization of phenol and formaldehyde. Example of addition polymer? Familiar examples of cross-linked polymers are Bakelite, rubber, and casting (boat) resin. Options (a) Polythylene (b) Nylon-66 (c) Polystyrene (d) Bakelite. c) Cross-linked structure. 1) Thermosetting polymers 2) Thermoplastic polymers 3) Bakelite 4) Melamine-formaldehyde polymer 38. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. Bakelite is an example of thermosetting polymer. The baking technology was born at the end of the 19th century with early thermosetting plastics such as Bakelite requiring temperatures of at least 150 °C. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. rubbery. These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in moulds and again become infusible. (d) Soften on heating and harden on cooling, can be reused. Propose a structure for Bakelite. More than a century ago, Leo Baekeland patented the first fully synthetic polymer, a cross-linked phenolic resin that was later named Bakelite. Log in Join now 1. Cross-Linked. They have a stronger covalent bond in comparison to other linear polymers. - wherein. Bakelite is an example of the thermosetting polymer. Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene). Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Bakelite, a durable plastic used for the casing of early radios and TVs, was the first of the thermosetting polymers. The cross-links are shown in a two-dimensional network, but in practice three-dimensional networks are formed. D. malamac. Explanation: Thermosetting polymers are cross linked and permanently rigid polymers which undergo permanent charge on heating. 5 points Which is an example of. An object of cross-linked polymer, such as insulation for a cable conductor or a cable sheath, is formed by using a starting material containing a peroxide and a polymer material with the ability to undergo a cross-linking reaction in the presence of peroxide. Branched chain polymers - contain linear chains having some branches, Example - low density polymer. A. buna-S . 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