Thermoplastics : These are the polymers which can be easily softened repeatedly when heated and hardened when cooled with little change in their characteristics. The intermolecular forces in these polymers are intermediate between those of fibres and elastomers. There is no cross binding between the chain. The softening happens as the polymer chain go more and more freely because of absence of cross link. When heated, they form a fluid which can be moulded into any desired shapes and then cooled to get the desired product and melt.
Example : Polythene, polystyrene, PVC, teflon etc.
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