PLASTICS :



Organic materials of high molecular weight and it can be moulded into any desired form when it is subjected to heat and pressure in the presence of a catalyst are called plastics.

    Resins are the basic binding materials which form a major part of the plastics and which actually has undergone polymerizations and condensation reactions during their preparation.

Plastics divided into two groups.

  1.     Thermo plastics.
  2.    Thermo setting plastics.

Thermo plastics:

    Plastics which can be softened on heating and hardness on cooling are called thermo plastics. The chemical nature of thermo plastics are un altered by repeated heating and cooling.

Eg:

    PVC, Polyethylene, Polystyrene.

Thermo setting plastics:

    Plastics which get hardened during heating (mounting process) and then cannot be softened ate called as thermo setting plastics. Since they acquire three dimensional cross-linked structures with predominantly strong covalent bonds, these bonds retain the strength on reheating.

Eg:

    Bakelite, polysters, silicons.
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