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.
(a) Dipole: Dipole interaction in PVC is absent.
(b) Sulphur develops cross-linking.
(c) Polypropylene is harder and stronger than polyethylene.
Could a copolymer be formed in both addition and condensation polymerization or not? Explain with examples.
Briefly describe the following terms giving one example of each:
(i) Polyolefins
(ii) Polyamides
(iii) Polyesters
(iv) Polydienes
Write the equations for the synthesis of:
Polymethyl methacrylate
Also give one important use of it.
Write the equations for the synthesis of:
Polyacrylonitrile
Also give one important use of it.
