write short notes on use of plastic
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A plastic is a material that can change its shape. Many things are made of plastics, usually because making them the right shape is easy. ... These plastics can be used for 3D printing, because the plastic will become soft enough to form into different shapes, and then become hard again when they cool down.
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Polythene is the most common plastic used to form polythene bags and to package food. PVC or Poly Vinyl Chloride is the polymer of vinyl chloride. When vinyl chloride is heated at 80ºC in the presence of catalyst hydrogen peroxide, then polymerization takes place. As a result, Poly Vinyl Chloride is formed.
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