摘要
对位卤索取代的苯酚与五甲基三氯单茂钛在三乙胺存在下进行酯化反应,制得4种五甲基茂基三(对-卤代苯氧基)钛的新型茂钛化合物[Cp*Ti(O-C6H4-X)3,(X为F、Cl、Br、I)].经元素分析、质谱、核磁共振谱证实了上述结构.在甲基铝氧烷和三异丁基铝活化下,4种茂钛化合物对苯乙烯间规聚合显示出极高的催化活性,制得的间规聚合物间规度(大于96%)和熔点(大于270℃)高.4种茂钛化合物的活性从大到小依次为:五甲基茂基三(对-氟苯氧基)钛、五甲基茂基三(对-氯苯氧基)钛、五甲基茂基三(对-溴苯氧基)钛、五甲基茂基三(对-碘苯氧基)钛.
Four kinds of novel monotitanocenes [Cp*Ti(0-C6H4-X)3, (X=F, Cl, Br, I)] were synthesized by esterifica-tion reaction of Cp*Tid3 with HO-C6H4-X at the presence of triethylamine. Their structures were characterized by means of element analysis (EA), nuclear magnetic resonance hydrogen spectrometry (1H-NMR) and mass spectrometry (MS). At the activation with methylaluminoxane (MAO) and triisobutylaluminium (TIBA), the monotitanocene catalysts showed very high catalytic activity, in an escalating order of Cp*Ti(0-C6H4-I)3 < Cp*Ti(O-C6H4-Br)3 <Cp*Ti(0-C6H4-Cl)3 <CP*Ti(O-C6H4-F)3. The syndiotactic polystyrene (sPS) so prepared with the catalysts possess a syndiotacticity over 96% and a melt point of 270 ℃.
出处
《合成树脂及塑料》
CAS
2003年第5期5-7,32,共4页
China Synthetic Resin and Plastics
基金
国家自然科学基金(20174050)
中国石油化工集团公司重点资助课题
关键词
制备
聚苯乙烯
催化剂
间规聚合
茂钛化合物
polystyrene
syndiotactic polymerization
titanocene complexes
catalyst
