摘要
用五甲基环戊二烯三苄氧基 [Cp* Ti( OBz) 3]与甲基铝氧烷 ( MAO)组成的催化体系催化丙烯聚合 ,比较了甲苯、庚烷及其混合溶剂对丙烯聚合的影响 .研究不同 n( Al) /n( Ti)比及单体压力对聚合活性和产物分子量的影响 ,发现聚合活性随 n( Al) /n( Ti)比增加先升高后下降 ,而随单体压力的增加明显升高 ,产物分子量随 n( Al) /n( Ti)比变化不明显 ,而随单体压力升高略有下降 .用13C NMR、DSC、拉伸实验对产物进行了表征 ,结果表明所得产物为高分子量的无规聚丙烯 。
The propylene polymerization in the presence of monocyclopentadienyltitanium compound and methylaluminoxane(MAO) carried out in an autoclave. The effect of different solvents on the propylene polymerization was compared. With the raise of n (Al)/ n (Ti) ratio, the activity of the catalyst increased firstly and then decreased, but the molecular weight of PP was independent of it. The catalytic activity increased linearly with monomer pressure, while the molecular weight of the polymer decreased slightly with an increase in monomer pressure. The products were characterized by 13 C NMR, DSC and tensile strength measurement. The high molecular weight atactic polypropylene had a good elasticity.
出处
《应用化学》
CAS
CSCD
北大核心
2000年第3期292-295,共4页
Chinese Journal of Applied Chemistry
基金
广东省自然科学基金! (980 32 7)
关键词
丙烯聚合
茂金属催化剂
无规聚丙烯
立体结构
propylene polymerization,metallocene catalyst,atactic polypropylene,stereo structure
