Plastics

Subject: Science

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Overview

Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure. This note provides information on types, uses, and effects of plastics.
Plastics

Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure.

Types of plastics

  1. Thermosetting plastics:

    The plastics that does not become soft on heating and cannot be remolded into desired shapes is called thermosetting plastic. It is hard and strong. It becomes harder when heated but it does not melt. It is generally resistant to heat. That is why they are used as heat bearing insulator. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it.

    source:www.intercosmo.net
    source:www.intercosmo.net
  2. Thermoplastics:

    The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. It is usually elastic and soft. It can be given any shape when they are heated again and again.It means they can be remolded second time for different purpose. They are used in making ropes, bucket, pipe, etc. The main types if thermoplastics are polythene, Polyvinyl Chloride(PVC) and polystyrene.

Properties of plastics

  • Plastics are lighter than metals, wood and stone.So, the articles of plastic can be easily carried.
  • It does not corrode in air and water.
  • It is not affected by acids and other chemicals.
  • It is usually hard and transparent.
  • It can be made in various colors.

Uses

  • It is a bad conductor of heat and electricity. So, it is used as a good insulator of electric wires.
  • It is also used for making different types of vehicles.
  • It is also used to make pipeline fitting, water tanks, water bags, etc.
  • They can be used as thermal and electrical insulators.
  • It is airproof, waterproof and non reactive. So, it is used for packing purpose as well.
  • It is light and easy to use.So, it is used even in fans and wings ofplane. Light things causereduction in the consumption of oil.

Demerits

  • It is non biodegradable.
  • It causes soil, water and air pollution.
  • Some plastic catch fire easily and when burnt they produce poisonous gases and smoke.
  • It cannot be seen as good as stone or wood.

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Things to remember
  • Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure.
  • There are two types of plastics. They are thermosetting plastics and thermoplastics.
  • Plastics is used as a good insulator of electric wire.
  • Plastics is used to make different types of vehicles, make pipeline fitting, water tank, gags, thermal and electrical insulator, etc.
  • Plastics  is use even in fans and wings of plane.
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.
Videos for Plastics
Bird Island. Plastic Vs Nature. Nature looses!
Plastics - 1944 Science & Chemistry Educational Documentary - WDTVLIVE42
Understanding How Plastics Are Manufactured
Questions and Answers
Glass is hard, amorphous, transparent and homogenous mixture of silicates of different metals. P.V.C. is not used to cover the handle of pressure cooker but Bakelite is used because P.V.C. becomes soft on heating while Bakelite becomes hard on heating and is bad conductor of heat.

The major two causes of chemical pollution due to plastic are:
a. Plastics are non-degradable.
b. Many plastics often produce poisonous gases and smoke on burning.

The thermosetting plastic is used to cover the handle of pressure cooker because it is bad conductor of heat and it does not become soft on heating.
Environmentalists request to avoid the use of plastic because plastic is non-degradable substance which produces poisonous gas and pollutes the environment.

Two reasons that plastics are useful are:
a. It is cheaper and is easily available.
b. It can be recycled and reused.

Polythene Bakelite
  1. It becomes soft on heating.
  2. It can be remolded.
  1. It becomes hard on heating.
  2. It cannot be remolded.
Thermosetting plastic Thermoplastic
  1. It becomes hard on heating.
  2. The articles made from thermosetting plastic cannot be remolded.
  1. It becomes soft on heating.
  2. The articles made from thermoplastic can be remolded.
Quiz

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