Semisynthetic polymers : These polymers are mostly derived from naturally occurring polymers by chemical changes. As cellulose is naturally happening polymers, cellulose on acetylation with respect to acetic anhydride in the presence of sulphuric acid forms cellulose diacetate polymers. It is used in building materials and thread like films glasses etc. Vulcanized rubber is also a kind of semisynthetic polymers used in creating tyres etc. gun cotton which is cellulose nitrate needed in making explosive.

•        Semi-synthetic polymers : Rayon and other cellulose derivatives like cellulose acetate, cellulose nitrate etc., are semi-synthetic polymers. These defined as thermoplastic polymers. Viscose rayon in the type of a thin transparent layer is known as cellophane. Cellophane is become softer with glycerol. Not like plastic sheets it takes up water.
•          Rayon : Rayon is a man made material which consists of purified cellulose in the form of long fibres. Cellulose is reacted with cold NaOH solution to purify it and then treated with CS₂ to form a viscose solution. That is why rayon is sometimes defined as viscose rayon. This solution is given to go through fine pores in metal cylinder, into a dilute H₂SO₄. This produces in the creation of long fibres. Rayon fibre is chemically similar to cotton but has a shine like silk. As such rayon is also defined as artificial silk. Rayon is needed on a big scale for creating textiles, tyre-chord, surgical dressings and carpets. Unlike fully synthetic polymers, it takes moisture and is bio-degradable.

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