(dbm)_3Ti(OPh)/MAO合成间规聚苯乙烯

Syndiotactic Polymerization of Styrene via(dbm) 3Ti(OPh)/MAO

用（ｄｂｍ）３Ｔｉ（ＯＰｈ）／ＭＡＯ催化苯乙烯间规聚合反应。研究了Ａｌ／Ｔｉ摩尔比、催化剂浓度、聚合时间和单体浓度等因素对该反应的影响。结果表明，该非茂钛催化剂体系本体聚合ｎ（Ａｌ）／ｎ（Ｔｉ）＝５００时聚合活性可达６１５ｋｇ／（ｍｏｌｈ）（每摩尔Ｔｉ每小时生成的ＰＳ量）；溶液聚合催化剂浓度为２００～１２００μｍｏｌ／Ｌ时，聚合活性衰减平缓，苯乙烯的转化率随时间而直线上升。用１３ＣＮＭＲ、ＤＳＣ表征了得到的聚合物，其间规度≥９６％，熔点为２６９～２７１℃。

Syndiotactic polystyrene(sPS)was polymerized with(dbm) 3Ti(OPh)/MAO The influence factors were investigated including Al/Ti molar ratio,catalyst concentration,polymerization time and styrene concentration When Al/Ti=500,the bulk polymerizing activity was up to 615 kg/(mol·h) Under the given condition,with the polymerization time increasing,the conversion of styrene increased almost linearly The syndioatcticity of the titled polystyrene was no less than 96% and the melting point was 269～271 ℃ The polymer was characterized with 13 C NMR and DSC as well