GENTRANS 50 Lecture Notes - Lecture 1: Polyethylene, Polyvinyl Chloride, Nylon 6

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Polymers are high molecular mass substance consisting of large number ofrepeating structural units. As polymers are single, giant molecules i. e. big size molecules, they are also called macromolecules: monomers: The simple molecules which combine to form polymers are called monomers: polymerization: The process of formation of polymers from respective monomers is called polymerization: classification of polymers, based on source of availability, it is classified into, natural polymers: polymers obtained from nature, mostly plants and animals. Cellulose, starch, etc: synthetic polymers: polymers prepared in laboratory. Synthetic rubber (buna - s) etc: semi synthetic polymers: polymers derived from naturally occurring polymers by carrying out chemical modifications. Examples - rayon (cellulose acetate), cellulose nitrate, etc: based on the structure of polymer, it is classified into, linear polymers: polymer consists of long and straight chains. Examples - high density polythene, polyvinyl chloride, etc: branched chain polymers: polymers contains linear chains having some branches.

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