摘要
比较茂基三苄氧基钛［ＣｐＴｉ（ＯＢｚ）３］／ＭＡＯ和五甲基茂基三苄氧基钛［Ｃｐ＊Ｔｉ（ＯＢｚ）３］／ＭＡＯ两种均相催化体系的苯乙烯间规聚合；发现由于Ｃｐ＊Ｔｉ（ＯＢｚ）３主配体茂基上取代甲基的供电子效应，Ｃｐ＊Ｔｉ（ＯＢｚ）３／ＭＡＯ催化体系有较强的热稳定性和较高的催化活性，在较高的温度下（７０℃）仍然能够合成粘均相对分子质量高达３．０×１０５的间规聚苯乙烯（ｓＰＳ）；研究了聚合温度、催化剂浓度和苯乙烯浓度对Ｃｐ＊Ｔｉ（ＯＢｚ）３／ＭＡＯ体系催化苯乙烯间规聚合的影响，最佳聚合条件为：聚合温度７０℃、催化剂浓度１．０４×１０－４ｍｏｌ／Ｌ、ｍ（Ａｌ）／ｍ（Ｔｉ）为８３０、ｃ（苯乙烯）＞４．３２ｍｏｌ／Ｌ．聚合反应产物用沸丁酮抽提８ｈ，不溶部分ｓＰＳ用ＧＰＣ，１３ＣＮＭＲ，ＦＴＩＲ，ＷＡＸＤ和ＤＳＣ等方法进行表征．
Catalytic activity and specificity of [CpTi(OBz) 3]/MAO and [Cp *Ti(OBz) 3]/MAO for the sydiospecific polymeritation of styrene were compared.The second system is a highly active and sydiospecific catalyst for styrene polymeritation at 50￣90 ℃.The influence factors,such as polymerization temperature, catalyst and styrene concentration, on styrene polymerization have been studied When the final polymerization product was extracted with boling butanone for 8 h, the insoluble fraction gave 98 2% to 98 7% syndiotactic polystyrene(sPS) with high molecular weight( M v=4 66×10 5￣1 96×10 5) and high melting temperature(269 5￣270℃) The sPS obtained was characterized by GPC, 13 C NMR, FTIR, WAXD and DSC
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第5期43-48,共6页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金
关键词
间规聚苯乙烯
五甲基
茂基三苄氧基钛
MAO
催化
metallocene, syndiotactic polystyrene, syndiospecific polymerization of styrene,η 5 pentamethylcyclopentadienyltribenzyloxy titanium catalyst
