中文摘要：

蒙脱土（MMT）填充等规聚丙烯（iPP）仅形成α-晶。该文利用MMT的Ca^2＋与庚二酸（PA）反应形成庚二酸钙（CaPA）制备了表面负载β-成核剂的MMT（β-MMT）,FTIR和TGA证实了β-MMT表面Ca PA的形成。采用DSC和XRD研究了β-MMT填充iPP纳米复合材料的β-成核作用和β-晶含量,观察到随着MMT/PA质量比减小（即PA用量增加）,iPP复合材料的结晶峰温提高,α-晶熔融峰强逐渐减弱,β-晶熔融峰强逐渐增强,最后仅出现β-晶熔融单峰,表明β-成核作用增强。XRD结果表明随着MMT/PA质量比减小,β-晶含量逐步提高,当MMT/PA质量比为100制备的β-MMT填充iPP纳米复合材料全部形成β-晶。以上结果表明,MMT粒子表面负载β-成核剂可实现MMT填充iPP复合材料结晶从α-晶转变为β-晶。

英文摘要：

Montmorillontie （MMT）filled isotactic polypropylene （iPP）forms α-crystal.In this paper,β-MMT with β-nucleating surface supported by calcium pimelate （CaPA）was prepared through chemical reaction between Ca^2＋and pimelic acid （PA）.The results of FTIR spectroscopy and TGA analysis ofβ-MMT confirmed the formation of CaPA on the surface of MMT.The crystallization temperature,β-nuclea-ting ability and the β-crystal content ofβ-MMT filled iPP composites were investigated by DSC and XRD analyses.It was observed that the crystallization temperature and intensity ofβ-crystal melting peak in-creased with decreasing MMT/PA mass ratio,indicating the enhancedβ-nucleating ability.The XRD re-sults showed that the β-crystal contents ofβ-MMT filled iPP composites increased with decreasing MMT/PA mass ratio.In addition,MMT filled iPP composites with β-crystal of 99% could be obtained by β-MMT prepared with MMT/PA mass ratio of 100.These results indicated that the β-nucleating agent sup-ported on the surface of MMT particles could change fromα-to β-nucleation in the MMT filled iPP com-posites.