Answer:
Thermoplastic
polymers :
(i)These
are the linear or slightly branched long chain molecules capable of repeatedly softening
on heating and hardening on cooling. 1
(ii)
These polymers passes intermolecular forces of attraction intermediate between elastomers
and fibres, e.g., polythene, polystyrene. 
Thermosetting
polymers: These polymers are cross linked or heavily branched molecules which
on heating undergo extensive cross linking in moulds and again become
infusible. These cannot be refused. 1
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