Write short notes on following:
(a) Polythene
(b) Polyvinyl chloride
(c) Polyacrylo nitrile
(d) Polystyrene
Answers
polythene :
a type of very thin plastic material, often used to make bags for food, etc. or to keep things dry
PVC: , A synthetic resin made from the polymerization of vinyl chloride. Second only to polyethylene among the plastics in production and consumption, PVC is used in an enormous range of domestic and industrial products, from raincoats and shower curtains to window frames and indoor plumbing.
Polyacrylonitrile, also known as polyvinyl cyanide and Creslan 61, is a synthetic, semicrystalline organic polymer resin, with the linear formula ₙ. Though it is thermoplastic, it does not melt under normal conditions. It degrades before melting.
Chemical formula: (C3H3N)n
Solubility in water: Insoluble
Melting point: 300 °C (572 °F; 573 K)
Polystyrene (PS) /ˌpɒliˈstaɪriːn/ is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight.
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