Write the full form of $PHBV$. Also,write down its preparation and uses.

(N/A) The full form of $PHBV$ is poly $\beta$-hydroxybutyrate-co-$\beta$-hydroxyvalerate $(PHBV)$.
Preparation: It is obtained by the copolymerization of $3$-hydroxybutanoic acid and $3$-hydroxypentanoic acid.
The reaction is as follows:
$n CH_3-CH(OH)-CH_2-COOH + n CH_3-CH_2-CH(OH)-CH_2-COOH$ $\rightarrow -[O-CH(CH_3)-CH_2-CO-O-CH(CH_2CH_3)-CH_2-CO]_n- + 2n H_2O$
Uses: $PHBV$ is used in speciality packaging,orthopaedic devices,and in the controlled release of drugs.
$PHBV$ undergoes bacterial degradation in the environment.