LDPE/沸石分子筛复合膜性能研究

摘要

By means of melt blending and extrusion blow molding method, low density polyethylene (LDPE)/zeolite molecular sieves(ZMS) composite films were prepared, and their mechanical properties, crystallinity and moisture permeability were tested. The crystallization performance and non-isothermal crystallization kinetics of the samples were analyzed with DSC. The results show that when the amount of ZMS increased, the tensile strength and elongation at break of LDPE/ZMS composite films assumed a little bit increase initially and then decreased. By blending ZMS with LDPE,the crystallization rate of LDPE increased. The ZMS had an effect on heterogeneous nucleation. With the amount of ZMS being increased,the capacity of moisture permeability of the composite films increased gradually. By using Jeziorny method amended with Ozawa equation, the crystallization of the composite films was characterized efficiently.%采用熔融共混和挤出吹膜成型工艺方法,制备低密度聚乙烯(LDPE)/沸石分子筛(ZMS)复合膜.对膜试样的力学性能、结晶性能和透湿性能进行测试.采用DSC方法研究试样的结晶性能并用非等温结晶动力学对其进行分析.结果表明:随着ZMS用量的增加,LDPE/ZMS复合膜的拉伸强度及断裂伸长率先略增后呈现降低趋势.ZMS的加入使得LDPE的结晶速率增加,起到了异相成核的作用.随着ZMS用量的增加,复合膜透湿能力逐渐增强.采用修正Ozawa方程的Jeziorny法对复合膜的结晶性能可以进行很好的表征.