聚丙烯/蒙脱土纳米复合材料的湿热老化性能

用熔融插层法制备了2种聚丙烯/蒙脱土(PP/OMMT)纳米复合材料,考察了在90℃的水中进行0~80 d不同时长的湿热老化后的产物特征。添加少量纳米化蒙脱土的PP表面形貌被破坏时间可延长20 d左右,比纯PP拉伸强度保持率提高67.5%,冲击强度保持率提高12.4%。PP、PP/OMMT复合材料湿热老化的损伤主要是环境中的水分子的直接物理作用,其中PP/季铵型OMMT纳米复合材料优良的抗湿热老化能力是其较高的结晶度、剥离性纳米化OMMT片层对水分子和热的物理阻隔效应以及OMMT与PP间较强的相互作用的共同结果。

Hygrothermal aging performance of polypropylene/montmorillonite nanocomposites

Two kinds of polypropylene/montmorillonite nanocomposites are prepared with melting intercalation.After hygrothermal aging in distilled water at 90℃ for 0 to 80 days their properties are studied.Adding a small amount of nano-montmorillonite can extend PP's surface breaching time for 20 days,and improve the keeping rate of tensile strength by 67.5% and impact strength by 12.4%,compared with pure PP.The reason of the hygrothermal aging damage is mainly the direct physical interaction between water molecules and the material.The excellent anti-hygrothermal aging properties of PP/(quaternary-ammonium-hybrided)OMMT nanocomposites mainly result from its high crystallinity degree,the physical barrier of OMMT nano-layer to thermal effects and water molecules,and the strong interaction between OMMT and PP.