聚氯乙烯/十二烷基硫酸根柱撑水滑石复合材料的结构与性能

Structure and Properties of Poly(vinyl chloride)/DodecylSulfonate-pillared Hydrotalcite Composites

通过离子交换反应制备了十二烷基硫酸根柱撑水滑石 (HT- SDS) ,进而利用聚氯乙烯 (PVC)与HT- SDS熔融共混加工和HT- SDS存在条件下的氯乙烯原位悬浮聚合两种方法制备了PVC/水滑石 (PVC/HT)复合材料 ,并对复合材料的结构和性能进行了研究。发现采用前一种方法得到的复合材料中水滑石分散尺寸大多在 10 0nm以上 ,而采用后一种方法得到的复合材料中水滑石均匀、取向分散在PVC基体中 ,至少有一维尺寸小于 10 0nm。随着水滑石含量增加 ,PVC的热稳定性提高 ,而玻璃化温度变化不大。采用后一种方法得到的复合材料的拉伸性能和冲击性能明显优于采用前一种方法得到的复合材料。

Dodecyl sulfonate-pillared hydrotalcite (HT-SDS) w as prepared through ion-exchange reaction, which was blended with PVC to prepare composites via both melting mixing and in situ suspension polymerization of vinyl chloride. TEM micrographs showed that the sizes of most hydrotalcite particles were greater than 100 nm in the composites prepared via melting mixing, while less than 100 nm and disperse d homogeneously via in situ polymerization, due to being exfoliated. The thermal stability of PVC composites improved with increasing HT-SDS contents. The compo s ites prepared via in situ polymerization possessed higher modulus, tensile and impact strengths than those of via melt mixing.