The results indicate that photodegradation induced by photosentizer is the main reason for that rapid drop of mechanical properties of the film during its initial period of degradation.

• 结果表明,在降解初期使塑膜力学性能迅速下降的主要原因是由光敏剂引发的光降解造成的,降解的主要产物为醛、酮、酸、酯和氢过氧化物。