(a) Explain the preparation of Nylon-6, 6 with equation.
(b) What are thermoplastic polymers? Give an example
(c )Write the structure of isoprene (2-methyl-1,3-butadiene).

Explanation

(a) It is obtained by the condensation polymerization of hexamethylenediamine with adipic acid under hig! pressure and at high temperature.
`underset("Adipic acid")(nHOOC - (CH_2)_(4)-COOH) + underset("Hexamethylenediamine")(nH_2N-(CH_2)_(6) -NH_(22) underset("High Pressure")overset(533K)(rarr)[overset(H)overset(|)(N)-(CH_2)_(6)-overset(H)overset(|)(N)-overset(O)overset(||)(C )-(CH_2)_(4)-overset(O)overset(||)(C )]_(4)`
(b) These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling,
Example:Polythene or Polystyrene or Polyvinyl chloride
(c) `underset(("Isoprene"))underset("Cis-2-methylbute 1,3-diene")(CH_2=underset(CH_3)underset(|)(C )-CH=CH_2)` .