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Natural polymers

Polymers which are obtained from animals and plants are known as natural polymers. Examples of natural polymers are as follows:
Natural polymer
1. Polysaccharide
2. Proteins
a-l-Amino acids
3. Nucleic acid
4. Silk
Amino acids
5. Natural rubber (cis-polyisoprene)
Isoprene (2-methyl-1,3-butadiene)
6. Gutta-purcha (trans-polyisoprene)
Natural polymers which take part in metabolic processes are known as biopolymers. Examples are polysaccharides, proteins, RNA, and DNA.

Semi-synthetic polymers

Polymers which are prepared from natural polymers are known as semi-synthetic polymers. Most of the semi-synthetic polymers are prepared from cellulose. Examples are cellulose acetate, cellulose nitrate, cellulose xanthate, and Kayon.

Synthetic polymers

Man-made polymers, i.e., polymers prepared in laboratory are known as synthetic polymers. Example are PVC, polyethylene, polystyrene, nylon-6, nylon-66, nylon-610, terylene, and synthetic rubbers.

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