Answer:
(i) Novolac is a linear but bakelite is a cross- linked polymer of phenol and formaldehyde. For structures refer to pages 15/14-15/15. (ii) Terylene contains ester functional groups which are polar in nature. Therefore, the intermolecular forces of attraction involved in terylene are strong dipoe-dipole interactions as shown below :
Buna-S, on the other hand, does not have polar functional groups. It has only non-polar hydrocarbon chains and hence has only weak van der Waals forces of attraction as shown below :
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