CBSE Class 12 Chemistry Polymers Notes and Questions

CBSE Class 12 Chemistry Polymers Notes and Questions. Based on CBSE and NCERT guidelines. The students should practice these Questions to gain perfection which will help him to get more marks in CBSE examination.The preparation should be in a manner which helps the students to concentrate more in areas which carry more marks.

 

1. Polymer: GIST
It is a very large molecule having molecular mass 103 - 107 g mol-1. They are formed by joining together repeating structural units.
 
2. Classification of Polymers:
(a) Based On Source:
(i) Natural: Found in plants and animals, e.g. Proteins, cellulose, natural rubber, silk, wool.
(ii) Synthetic: Man-made e.g. Nylon, polyster, neoprene, Bakelite, Teflon, PVC, polystyrene.
 
(b) Based On Structure:
(i) Linear Polymers: this consist of long and straight chain repeating units e.g. Polythene (HDPE), PVC,nylon, polyester.
(ii) Branched Polymers: This contain linear chains having some branches e.g. amylopectin, glycogen etc.
(iii) Cross Linked Polymers: Strong covalent bonds are present between various linear polymer chains.
E.g. Bakelite, urea- formaldehyde polymer, melamine, formaldehyde polymer etc.
 
(c) Based On Mode Of Polymerization:
(i) Addition Polymers: These are formed by the repeated addition of monomer molecules possessing multiple bonds, e.g., polythene, polypropene, polystyrene, PMMA (polymethyl metha crylate)
(ii) Condensation Polymers: These are formed by the repeated condensation reaction of different bifunctional or trifunctional monomers, with the elimination of small molecules like water,HCL,NH3,alcohol etc. e.g. Bakelite,nylon,polyster,urea- formaldehyde resin.
 
(d) Based On Molecular Forces:
(i) Elastomers: Forces of interaction between polymer chains is weakest, e.g. natural rubber, neoprene,vulcanized rubber.
(ii) Fibers: Strong hydrogen bonds are present between the polymer chains. They have high tensile strength e.g., nylon.polyster, silk, wool, orlon, rayon etc.
(iii) Thermoplastics: They are linear/slightly branched chains molecules capable of repeated softening on heating and hardening on cooling,e.g., polythene,PVC, polystrene, polypropene.
(iv) Thermosetting Plastics: They are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linkages and become infusible, e.g., bakelite,urea formaldehyde resin.
 
 

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