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为了制备聚丙烯/蒙脱土纳米复合材料,将Brookhart型的乙烯齐聚催化剂负载于有机蒙脱土片层间,进一步与丙烯聚合茂金属催化剂进行复配得到双功能催化体系。采用这种双功能催化剂体系通过催化乙烯齐聚得到α-烯烃/蒙脱土的齐聚产物,进一步将丙烯与这种齐聚产物共聚,合成了一系列结构不同的聚丙烯/蒙脱土纳米复合材料。通过气相色谱、X射线衍射(XRD)分析得出蒙脱土负载的铁系催化剂催化乙烯齐聚产物是以C_4~C_(16)为主的α-烯烃,蒙脱土以片层形式分散于齐聚产物的甲苯溶液中。研究了蒙脱土负载的铁系催化剂与共聚催化剂复配催化乙烯齐聚以及丙烯与齐聚产物共聚合的情况。通过XRD、透射电镜、差示量热分析、凝胶渗透色谱分析表征可知,蒙脱土以纳米片层剥离的形式均匀分散于聚丙烯基体中,聚丙烯/复合材料的结晶温度比纯聚丙烯有所下降,所得聚丙烯基体分子量在8.1×10~4~17.1×10~4g/mo L。
In order to prepare polypropylene / montmorillonite nanocomposites, a Brookhart-type ethylene oligomerization catalyst was loaded on the interlayer of montmorillonite and further mixed with propylene polymerization metallocene catalyst to obtain bifunctional catalyst system. Using this bifunctional catalyst system, the oligomerization product of α-olefin / montmorillonite was obtained through the catalytic oligomerization of ethylene. A series of propylene / montmorillonite nanocomposites Composites. The results of gas chromatography and X-ray diffraction (XRD) showed that the iron-based catalysts supported on montmorillonite were the α-olefins mainly composed of C_4 ~ C_ (16). The montmorillonite was dispersed in the form of lamella Toluene product solution of the toluene solution. The oligomerization of iron with montmorillonite catalyst and copolymerization catalyst was studied to catalyze the oligomerization of ethylene and the copolymerization of propylene and oligomerization products. The results of XRD, TEM, DSC and GPC showed that the montmorillonite was uniformly dispersed in the polypropylene matrix in the form of nanosheet peeling. The crystallization temperature of the polypropylene / composite was higher than pure polypropylene The molecular weight of the resulting polypropylene matrix is 8.1 × 10 -4 to 17.1 × 10 -4 g / mol.