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采用力学性能测试和红外光谱法对自研的光和生物双降解聚乙烯地膜在自然降解过程中的力学性能和化学结构变化进行了研究。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。经对真菌抗性试验表明 ,当聚乙烯的分子量降至 5 0 0 0左右时 ,易被微生物侵蚀 ,即具有生物降解性。而塑膜中加入的改性淀粉起到加速这种侵蚀的作用。
The mechanical properties and chemical structure changes of self-made biodegradable polyethylene film were studied by mechanical properties test and infrared spectroscopy. The results showed that the main reason for the rapid decrease of mechanical properties of plastic film in the early stage of degradation was photodegradation induced by photosensitizer. The main products of degradation were aldehydes, ketones, acids, esters and hydroperoxides. The fungal resistance test showed that when the molecular weight of polyethylene dropped to about 50000, it is easy to be attacked by microorganisms, which is biodegradable. The plastic film modified starch added to accelerate the erosion of this role.