Question

can answer the important points of chapter polymers (class 12th)

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Answer 1

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ᑫᑌᗴՏTIOᑎ ::::

Points to remember from polymers (class 12, cbse)

Troubled with polymers?

here are some important points to remember

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Polymers : Important points -

Polymers: 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.

Monomers : The simple molecules which combine to form polymers by forming single or multiple bonds 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. Examples – Cellulose, starch, etc.

Synthetic Polymers : Polymers prepared in laboratory. Examples – Teflon, Nylon 6,6 , 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. Examples – Low density polythene

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.

Based on the mode of polymerization, it is classified into:

Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds.

It is further classified into :

Homopolymers :Polymers formed by the polymerisation of a single monomeric species. Examples – Polythene, Polystyrene.

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 bi-functional or tri-functional monomeric units with elimination of simple molecules. Examples – Nylon 6, 6, Nylon 6.

Based on molecular forces it is classified into :

• Chain initiating step
• Chain propagating step
• Chain terminating step

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