chemistry 12th class cbse notes

The biopolymers which disintegrate by themselves in biological systems during a certain period of time by enzymatic hydrolysis and to some extent by oxidation are called biodegradable polymers.

Poly-B-hydroxybutyrate-CO-B-hydroxyvalerate (PHBV):

It is a copolymer of 3-hydronypentanoic acid in which monomer unit are connected by the ester linkage.

Poly-B-hydroxybutyrate-CO-B-hydroxyvalerate (PHBV)


  • It is used in especially packaging orthopaedic devices and in controlled drug release.
  • Poly (glycolic acid) (lactic acid): This copolymer is called dendtron.

It is used for:

  • For stitching of wounds after an operation.
  • It is used for the body securing purposes.


It is an alternating polyamide glycine (containing two carbon atoms) and amionocaproicacid and 6-aminohexanioc acid (containing six carbon atoms).



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