中文摘要：

以蒙脱土（MMT）为载体,采用湿法和干法两种方法,制备了对聚丙烯（i PP）结晶具有高效β-成核作用的蒙脱土（β-MMT）和高β-晶含量的MMT填充β-i PP纳米复合材料（iPP/β-MMT）。通过对i PP纳米复合材料的结晶与熔融行为的研究,发现减小MMT/HA质量比或提高β-MMT用量,能改变MMT表面的β-成核作用,提高纳米复合材料中iPP结晶峰温和β-晶含量。制备的β-MMT,较传统β-成核剂更高效,制备方法简单且节约成本,更有利于得到高韧性的i PP纳米复合材料。

英文摘要：

Montmorillonite（MMT） generally has α-nucleating ability for isotactic polypropylene（i PP）.In order to obtain a novel MMT with β-nucleating surface（β-MMT）,calcium pimelate（Ca HA） as β-nucleator chemically supported on the surface of MMT was prepared through the chemical reaction between pimelic acid（HA） and calcium salt on the surface of MMT.Thermogravimetric analysis and infrared spectrometry confirmed the formation of Ca HA on the surface of MMT.The differential scanning calorimeter and XRD illustrate that the i PP nanocomposites filled by MMT and β-MMT exhibit MMT with different β-nucleating surface is obtained.Addition of MMT with β-nucleating surface into i PP matrix significantly increased the melting temperature and β-phase content,and can easily prepare the β-i PP nanocomposites with high β-phase content.