Question

write the Classification of polymers on the basis

of source or origin :​

Answer 1

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Poylmers are divided into three categories : a.Natural b. Synthetic c. Semisynthetic

a. Natural polymers :

The polymers obtained from natural source aresaid to be natural polymers. They are further subdivided into two types

i. Plant polymers :

These are obtained from plants. For example, cotton and linen are obtained from cotton plant and flax plant respectively. Natural rubber is another example of natural polymer which is manufactured from the latex obtained from bark of rubber trees.

ii. Animal polymers :

These are derived from animal sources. For example, wool is obtained from hair of sheep. Silk is obtained from silkworm.

b. Synthetic Polymers :

These are man- made polymers. These polymers are artificially prepared by polymerization of one monomer or copolymerization of two or more monomers. Nylon, terylene, neoprene are synthetic polymers. These are further divided into three subtypes, namely, fibres, synthetic rubbers and plastics.

c. Semisynthetic polymers :

These are derived from natural polymers. Theseare also called regeneratedfibres.Cellulose derivatives such as cellulose acetate rayon,cellulose nitrate, viscose rayon,cuprammonium rayon are a few examplesof this category.

Semisynthetic polymers are used in preparation of non-inflammable photographic films, cinema films, varnishes, etc.