Answered

4. Consider the Step Growth Polymerization method:

(a) Describe how the following polymers are produced commercially. Include equations and appropriate reaction conditions:

(i) Poly(ethylene terephthalate)
(ii) Poly(p-phenylene terephthalamide)
(iii) Poly(ether ether ketone)
(iv) Polyimide
(v) Polycarbonate
(vi) Polysulfone
(vii) Polybenzimidazole



Answer :

Final answer:

Step-Growth Polymerization forms polymers by reacting complementary functional groups on different monomers to create dimers. Examples include PET from terephthalic acid and ethylene glycol, and Polycarbonate from a carbonate and a bisphenol.


Explanation:

Step-Growth Polymerization involves the joining of different monomers through complementary functional groups in a non-sequential manner, forming dimers. One such example is the production of Poly(ethylene terephthalate) (PET) from 1,4-benzenedicarboxylic acid and 1,2-ethanediol via esterification. Another example is the formation of Polycarbonate from a carbonate and a bisphenol. These reactions typically occur with the release of small byproducts like water or alcohol.


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