合成了3种顺-5-降冰片烯-内-2,3-二羧酸酯类内给电子体,考察了内给电子体空间位阻对催化剂催化1-丁烯於浆聚合的影响.实验结果表明,当外给电子体为二异丁基二甲氧基硅烷时,以顺-5-降冰片烯-内-2,3-二羧酸二甲酯为内给电子体制备的催化剂催化得到的聚丁烯相对分子质量最大,为98.1×104,相对分子质量分布最宽(PDI=5.6).就提高催化剂活性而言,顺-5-降冰片烯-内-2,3-二羧酸二乙酯内给电子体更有优势.此外,对比考察顺-双环[2,2,1]-庚-内-2,3-二羧酸二乙酯内给电子体对催化剂催化性能影响发现,降冰片烯环上双键的还原大大降低了催化剂的活性.
Three cis-5-Norbornene-endo-2,3-dicarboxylic acid esters were synthesized and employed as internal electron donor (IED) of Ziegler-Natta catalysts,and 1-butene polymerizations were performed under these catalysts prepared.It is found that PB obtained by catalyst containing cis-5-norbornene-endo-2,3-dicarboxylic acid dimethyl ester as IED and diisobutyldimethoxysilane as external electron donor,possess the largest Mw (98.1 × 104),the narrowest PDI (5.6),and the highest isotacticity (97.0％),while the activity of catalyst employed cis-5-norbornene-endo-2,3-dicarboxylic acid diethyl ester as IED is much higher compared with others.What is more,the performance of the cis-5-norbornene-endo-2,3-dicarboxylic acid ester-based Ziegler-Natta catalysts is much better in catalyst activity than the Ziegler-Natta catalyst containing cis-bicyclo [2.2.1] hept-endo-2,3-dicarboxylic acid diethyl ester as IED.
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