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CBSE Class 12 Chemistry Polymer Exam Notes. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.
1.Polymers are high molecular mass substance consisting of large number of repeating structural units. As polymers are single, giant molecules i.e. big size molecules, they are also called macromolecules
2.Simple molecules which combine to form polymers are called monomers
3.Process of formation of polymers from respective monomers is called polymerization Classification Based On
1.Source of availability
(i) Natural Polymers: Polymers obtained from nature, mostly plants and animals.
Examples: Cellulose, Starch etc.
(ii) Synthetic Polymers: Polymers prepared in laboratory.
Examples: Teflon, Nylon 6, 6, Syntehtic rubber (Buna-S) etc.
(iii) Semi Synthetic Polymer: Polymers derived from naturally occurring polymers by carrying out chemical modifications.
Examples: Rayon (Cellulose acetate), Cellulose nitrate, etc.
2.Structure of Polymter
(i) Linear Polymers: Polymer consist of long and straight chains.
Example: High density polythene, polyvinyl chloride, etc.
(ii) Branched Chain Polymers: Polymers contains linear chains having some branches.
Examples: Low density polythene.
(iii) Cross linked or network polymers: Polymers in which monomer units are cross linked together to form a 3 dimensional network polymers.
Examples: Bakelite, Melamine, etc.
3.Mode of Polymerisation:
(i) Addition Polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds.
(a) Homopolymers: Polymers formed by the polymerisation of a single monomeric species.
Examples: Polythene, Polystyrene.
(b) Copolymers: Polymers formed by addition polymerisation of two different monomers.
Examples: Buna-S, Buna-N.
(ii) Condensation Polymers: Polymers formed by repeated condensation reaction between two different bifunctional or tri-functional monomeric units with elimination of simple molecules.
Examples: Nylon 6, 6, Nylon 6.
(i) Elastomers: Polymer chain are held together by weakest intermolecular forces. Polymers are rubber-like solids with elastic properties.
Examples: Buna-S, Buna-N, Neoprene.
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