【摘要】 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C₄^C₁₆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8.1×10⁴¹7.1×10⁴g/mo L。更多还原

【Abstract】 In order to prepare polypropylene/montmorillonite nanocomposites,the Brookhart type of ethylene oligomerization catalyst was supported on the organic montmorillonite layer, and then mixed with propylene polymerization catalyst（ metallocene catalyst） to obtain a kind of bifunctional catalytic system. Using the bifunctional catalytic system,a series of polypropylene/montmorillonite nanocomposites with different structures were synthesized by the copolymerization of olefins/montmorillonite and propylene. The results of gas chromatography（ GC） and X-ray diffraction（ XRD） showed that the C₄ C₁₆ α-olefins were obtained by montmorillonite-supported iron catalyst,and the montmorillonites were dispersed in the form of lamellar oxygenated product in toluene solution. The effects of montmorillonite supported iron catalyst and copolymerization catalyst on the polymerization of ethylene and the copolymerization of propylene and oligomerization products were investigated. The polypropylene/montmorillonite composites were characterized by XRD,TEM,DSC,NMR,and GPC. The results showed that montmorillonite were uniformly dispersed in the polypropylene matrix in the form of nanosheet stripping. The crystallization temperature of polypropylene/montmorillonite composites was lower than that of polypropylene. The molecular weight of the obtained polypropylene matrix is in the range of 8. 1 × 10⁴ to 17. 1 × 10⁴ g/mol.更多还原