Poly vinyl chloride (PVC) is produced through free radical chain polymerization of vinyl chloride monomers in the presence of initiators like benzoyl peroxide or hydrogen peroxide. PVC is a colorless, non-flammable and chemically inert powder with a specific gravity of 1.33 and melting point of 148°C. It is resistant to atmospheric conditions but not stable under heat and UV radiation. PVC has applications as both plasticized and unplasticized forms for uses like electrical insulation, chemical containers, safety equipment, and components of appliances and vehicles.

1. Polymer – Poly Vinyl Chloride
By
CH. SAI SRI RAMA CHANDRA
MURTHY

2. Poly Vinyl Chloride (PVC) –(CH2–CHCl)–:
Poly vinyl chloride is produced by free radical chain polymerisation
of vinyl chloride in presence of Benzoyl peroxide or Hydrogen
peroxide.
𝑛𝐶𝐻2 = 𝐶𝐻𝐶𝑙 − (𝐶𝐻2 − 𝐶𝐻𝐶𝑙) −Benzoyl peroxide
30-80°C

3. Preparation:
Vinyl chloride is prepared by treating acetylene with hydrogen
chloride at 60-80°C, and presence of metal oxide catalyst.
𝐶𝐻 ≡ 𝐶𝐻 𝐶𝐻2 = 𝐶𝐻𝐶𝑙
Properties:
1. PVC is colourless, non-inflammable and chemically inert
powder.
Metal oxide
60-80°C

4. 2. It has specific gravity 1.33 and melting point 148°C.
3. Resistant to atmospheric condition.
4. PVC is strong brittle.
5. It is resistant to atmospheric conditions like O2, CO2, and
moisture.
6. PVC is not stable to heat and UV radiation. It undergoes
degradation.

5. Engineering applications:
PVC treated with plasticizers is called plasticized PVC is used
for electrical insulations, injection moulding articles like tool
handles radio and telephone components, chemical containers,
and foams used in buildings, cameras and aircrafts. Unplasticized
PVC is rigid highly resistant to chemicals and brittle. This PVC
is used for making safety helmets, refrigerators components,
tyres, cycle and motor cycle mudguards.

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