Photo- and bio-degradable polyesters. photodegradation behaviors of aliphatic polyesters

Abstract

At present the biodegradable polyesters such as polycaprolactone are expected to be utilizable for preventing the environmental pollution due to plastics waste. The aliphatic polyesters are truly biodegradable in soils, but they arc also photodegradable. Molecular weight of polylactic acid decreases to the half value by Ih UV irradiation. The mainchain scission occurs via the Norrish II type photo cleavage. Polycaprolactone is also well photodegraded. From these results, the aliphatic polyesters are concluded to be utilizable for a photodegradable polymer. © 1997 TAPJ.