In this paper,using Low-density polyethylene (LDPE) as the matrix material,modified nano-titanium dioxide (nano-TiO2) as photodegradation agent and gelatinized starch (TPS) as biodegradation agent,the photo-biodegradable LDPE/nano-TiO2/TPS composite membrane materials were prepared by an internal mixer and a flat vulcanizer.The thermal properties,mechanical properties,photodegradation and biodegradability of the composite film materials were further studied.The results showed that the degradation ability of the photo-biodegradable film,after adding photo-biodegradable agent,was obviously higher than that of the pure LDPE film.Furthermore,the crystallinity and mechanical properties of the film materials increased with the increase of TPS biodegradable agent,and the degradation ability of the photo-biodegradable LDPE/nano-TiO2/TPS composite film became more obvious.When the mass of TPS was 20% of LDPE matrix,the maximum crystallinity of the composite film material was 29.3%.
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