Polyethylene/poly (lactic acid)/chitosan films, with and without poly (ethylene-g-maleic anhydride) (PEgMA) as compatibilizer, were prepared by extrusion and the degradation behavior under different times of standard weathering conditions was analyzed. The materials were characterized by means of infrared spectroscopy, scanning electron microscopy, tensile strength, differential scanning calorimetry and thermogravimetric analysis. It was demonstrated that blends of synthetic and natural polymers have a higher susceptibility to degradation in comparison to neat polyethylene and poly (lactic acid) films. Additionally, it is found that the incorporation of PEgMA into the extruded films apparently favored the polymer degradation, as it deduced from the fall of the mechanical properties when the films are exposed to accelerated weathering simulation.

聚乙烯/聚（乳酸）/壳聚糖薄膜，有或没有聚（乙烯-g挤出制备了顺丁烯二酸酐-顺丁烯二酸酐（PEgMA）作为增容剂，并分析了标准风化条件下不同时间的降解行为。通过红外光谱，扫描电子显微镜，拉伸强度，差示扫描量热法和热重分析对材料进行表征。已证明，与纯聚乙烯和聚（乳酸）薄膜相比，合成聚合物和天然聚合物的共混物对降解的敏感性更高。另外，发现将PEgMA掺入到挤出的薄膜中显然促进了聚合物的降解，这是由于当薄膜暴露于加速的风化模拟时机械性能的下降所导致的。