Question

Which of the following monomer in excess makes $PHBV$ more flexible?

• A. $\beta -$ hydroxy butanoic acid
• B. $\alpha -$hydroxy butanoic acid
• C. $\beta -$ hydroxy pentanoic acid
• D. $\alpha -$hydroxy pentanoic acid

Answer 1

Answer: (A), (C)

The correct options are
A $\beta -$ hydroxy butanoic acid
C $\beta -$ hydroxy pentanoic acid

$PHBV$ stands for poly $\beta$- hydroxybutyrate - co - $\beta$ - hydroxy valerate. It is obtained by the copolymerisation of $3$ - hydroxybutanoic acid and $3$ - hydroxy pentatonic acid. $\beta$ - hydroxy pentatonic acid gives more flexibility to the polymer.