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The small unit that repeats regularly to...

The small unit that repeats regularly to form a polymer

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Monomer
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A large numberof monomers (Simple molecules) combine together to form a larger molecule ( macro molecule) called as polymer. Each polymer is made up of a repeating structural unit. A polymer is said to be homopolymer if the structural unit is derived from one type of monomer molecules. if the repeating structural unit of a polymer is derived from more than one different types of monomers, the polymer is said to a copolymer. The homopolymers as well as copolymers may be formed by addition or condensation reactions. Alekenes and dienes polymerize by additions (Chain growth) mechanism involving carbocations, carbanions or free radical intermeidates. Dienes (Chloroprene) polymerise by 1, 4 addition mechanism to give cis or trans polymers. Natural rubber is, however, cis-polyisoprene. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshpaed as many times as desired are called thermoplastics (polyethene, polystyrene, PVC, teflon etc). While those which can be heated onoy once to give a particular shape are called thermosetting polymers (bakelite, melmac etc.) Chloroprene is the repeating unit in:

A molecule or group of molecules which are repeated to get a polymer is termed as _________

What is the repeating structural unit in polythene polymer ?

Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Vinyl chloride is the repeating unit in:

is a repeating unit for :

When small unit combine to form a large single unit then it is called