Briefly describe the following terms giving one example of each:
(i) Polyolefins
(ii) Polyamides
(iii) Polyesters
(iv) Polydienes
(ii) The polymers having amide linkages in the chain are known as polyamides. Examples are:
(a) Nylon–66 (from hexamethylene diammmine and adipic acid)
(b) Nylon–6 (from caprolactam)
(iii) The polymers having ester linkages in the chain are known as polyesters. Examples are:
(a) Terylene (from terephthalic acid and glycol)
(b) Glyptal or alkyd resin (from phthalic acid and glycol)
(iv) Polymers of this class are synthetic rubber. Examples are:
(b) Buna-S (from butadiene and styrene)
Write the equations for the synthesis of:
Polyacrylonitrile
Also give one important use of it.
Write the equations for the synthesis of:
Polymethyl methacrylate
Also give one important use of it.
Comment on:
(a) PVC is a hard plastic but polyethylene is soft wax-like.
(b) Addition of sulphur to nutural rubber improves its properties.
(c) Polypropylene is preferred ever polyethylene.
Could a copolymer be formed in both addition and condensation polymerization or not? Explain with examples.
