4.
rite note
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(i) Polyester
(ii) Fire retarding polymer
(iii) Addition polymerization
(iv) Cross-link polymerization
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Explanation:
Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain.[1] As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. The material is used extensively in clothing.
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