Chapter 3 Synthetic Fibres and Plastics

  • Synthetic fibre are called as man- made fibre whereas natural fibres are obtained from the nature.
  • Polymers are made up of many smaller units.
  • Natural fibres are obtained from plants and animals whereas man- made fibres or synthetic fibres are obtained by chemical processing of petrochemicals.
  • Many household articles like ropes, buckets, containers, furniture etc. are made up of synthetic fibres. Some highly specialized use of synthetic fibres are ships, space, space- craft etc.
  • Nylon, Rayon, polyester and acrylic are the different types of synthetic fibre depending upon the type of chemical used.
  • Different types of fibres differ from one another in their strength, cost, durability and water absorbing capacity.
  • Plastic is non- biodegradable, it does not degenerate in the environment. It is not eco- friendly.
  • We should avoid plastics to make the environment clean.
  • Acrylic is the artificial wool that resembles to the natural wool but it is cheaper than it. More durable clothes are obtained from the acrylic wool as compare to the natural wool.
  • By chemical treatment of wood pulp artificial silk or rayon is obtained. It is cheaper than the natural silk.
  • Nylon is made from coal, water and air. It is man- made or synthetic fibre. Nylon is the first fibre which us fully synthetic.
  • Plastics can be molded into desired shape. It is a synthetic material. It is also a polymer.
  • Polyester may be defined as the synthetic fibre which does not get wrinkled easily. It is used for making dress.
  • A chain of small units joined together to make a large unit called polymer.
  • Plastic is used for making commonly used polythene bags.
  • Terylene is polyester.
  • The plastics which gets deformed easily on heating and which can bent easily are called as thermoplastics. For example: comb, toys etc.
  • Plastic which cannot be deformed easily are called as thermosetting plastics. For example: Floor tiles, plates etc.

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Exercise 1 ( Page No. : 42 )

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