Chapters :
  • Synthetic Fibers & Plastics – 01

Synthetic Fibers & Plastics – 01

  • A Synthetic Fibre is a chain of small units joined together. Each small unit is actually a chemical substance. Many such small units combine to form a Large Single Unit Called A POLYMER.
  • Polymers occur in nature also. Cotton, For Example, is A Polymer Called Cellulose. Cellulose is made up of a large number of glucose units.
  • SILK FIBRE obtained from silkworm was discovered in China and was kept as a closely guarded secret for a long time. Attempts were made to make silk artificially. Towards the end of the nineteenth century, scientists were successful in obtaining A FIBRE having properties similar to that of silk. Such a fibre was obtained by chemical treatment of wood pulp. This fibre was called rayon or artificial silk.
  • Although Rayon Is Obtained From A Natural Source, Wood Pulp, yet it is a man-made fibre. It is cheaper than silk and can be woven like silk fibres. It can also be dyed in a wide variety of colours. Rayon is mixed with cotton to make bed sheets or mixed with wool to make carpets.
  • Nylon is another man-made fibre. In 1931, it was made without using any natural raw material (from plant or animal). It was prepared from Coal, Water And Air. It was the first fully synthetic fibre.
  • Nylon fibre was strong, elastic and light. It was lustrous and easy to wash. So, it became very popular for making clothes.
  • We use many articles made from nylon, such as socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Nylon is also used for making parachutes and ropes for rock climbing. A nylon thread is actually stronger than a steel wire.
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