PHBV: PHBV is a copolymer of two bifunctional B- hydroxy carboxylic acids, namely, B- hydroxybutyric acid (3 - hydroxybutanoic acid) and B- hydroxyvaleric acid (3-hydroxypentanoic acid). Hydroxyl group of one monomer forms ester link by reacting with carboxyl group of the other. Thus PHBV is an aliphatic polyester with name poly B-hydroxy butyrate - co - B-hydroxy valerate (PHBV). PHBV is degraded by microbes in the environment.
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