Question

Which of the following polymers is/are semi-synthetic polymers?

• A. Rayon
• B. Cellulose nitrate
• C. Cellulose xanthate
• D. Neoprene

Answer 1

Answer: (A), (B), (C)

The correct options are
A Rayon
B Cellulose nitrate
C Cellulose xanthate

Semi-synthetic polymers are those polymers that are prepared by chemically treating natural polymers.
a) Rayon is a regenerated cellulosic fibre. Rayon is obtained by the chemical reaction of carbon disulphide and $NaOH$ with wood pulp.
b) Cellulose nitrate is made by adding nitric acid to cellulose. Its physical properties differ according to the amount of nitrogen present in it.
c) Cellulose xanthate is also produced from cellulose. Between 200 and 400 $C_6{H}_7{O}_2(OH{)}_{2}OC{S}_{2}Na$ molecules combine to make a molecule of cellulose xanthate.
d) Neoprene is produced by the polymerization of chloroprene.