Maharashtra Board Solutions for Chapter: Introduction to Polymer Chemistry, Exercise 2: Use your brain Power

What is the type of polymerization in the following example?

What is the type of polymerization in the following examples?

$\mathrm{nHO}-({\mathrm{CH}}_2{)}_{\mathrm{x}}-\mathrm{OH}+\mathrm{nHOOC}-({\mathrm{CH}}_2{)}_{\mathrm{y}}-\mathrm{COOH}\to \mathrm{HO}-\left[\right({\mathrm{CH}}_2{)}_{\mathrm{x}}-\mathrm{O}-\mathrm{CO}-({\mathrm{CH}}_2{)}_{\mathrm{y}}-\mathrm{CO}{]}_{\mathrm{n}}-\mathrm{OH}$

From the cis-polyisoprene structure of natural rubber explain the low strength of van der Waals forces in it.

Explain how vulcanization of natural rubber improves its elasticity? (Hint: consider the intermolecular links.)