摘要
用ＭｇＣｌ_２负载钛系高活性催化剂进行乙烯气相聚合，考察了分别在预聚合阶段和气相聚合阶段加入不同的烷基铝化合物和给电子体试剂，对气相聚合催化活性的影响。气相聚合催化活性并不受预聚合中烷基铝改变的影响，但随气相聚合中烷基铝改变而变化。气相聚合用不同烷基铝得到的催化活性大小顺序为：Ａｌ（ｉ－Ｂｕ）_３＞ＡｌＥｔ_３＝Ａｌ（ｎ－Ｏｃｔ）_３＞＞ＡｌＥｔ_２Ｃｌ．预聚合中加入给电子体试剂能使气相聚合催化活性有一定程度提高，而在气相聚合中加入给电子体试剂使催化活性下降，同时也研究了Ｈ_２对气相聚合催活性和产物分子量的影响。
Gas-phas polymerizations of ethylene have been performed over a prepolymerizedMgCl_2-supported titanium catalyst.The effects of alkylaluminium compounds and electronicdonors in both the prepolymerization and gas-phase polymerization stages on the catalytic activitywere oberved, The catalytic activity unchanged by altering the alkylaluminium compounds in theprepolymerization stage,while it was changed by altering the alkylaluminium compounds in thegas-phase polymerization stage in the order of Al(i-Bu)_3>AlEt_3 = Al(n-Oct)_3>>AlEt_2Cl.Addi-tion of the electronic donors into the prepolymerization system slightly increased the catalytic activ-ity,whereas addition of the donors into the gas-phase polymerization system depressed the catalyt-ic activity.The effect of H_2 on the catalytic activity and molecular weigh t of the preducts is alsopresented,
出处
《中山大学学报（自然科学版）》
CSCD
1995年第3期45-50,共6页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目
关键词
催化剂
乙烯
烷基铝
电子给予体
气相法
聚合
supported titanium catalyst.gas-phase polymerization
alkylaluminium
electronicdonor
