高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (12): 2065.

• 论文 • 上一篇    下一篇

茂钛催化剂的苯乙烯间规聚合

祝方明, 林尚安   

  1. 中山大学高分子研究所, 广州 510275
  • 收稿日期:1996-10-30 出版日期:1997-12-24 发布日期:1997-12-24
  • 通讯作者: 祝方明, 男, 32岁, 博士, 讲师.
  • 作者简介:祝方明, 男, 32岁, 博士, 讲师.
  • 基金资助:

    国家自然科学基金;广东省自然科学基金

Metallocene Catalysts for Syndiospecific Polymerization of Styrene

ZHU Fang-Ming, LIN Shang-An   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou 510275
  • Received:1996-10-30 Online:1997-12-24 Published:1997-12-24

摘要: 比较了几种庞钛化合物/甲基铝氧烷/三甲基铝均相催化剂的苯乙烯间规聚合,认为茂基三正丙氧基钛[CpTi(O-n-Pr)3]是苯乙烯间规聚合的良好催化剂[催化效率:ωps·ωTi-1=4×104g·g-1].探索了催化剂浓度、单体浓度、聚合温度和时间对苯乙烯聚合的影响.聚合反应产物用佛丁酮萃取,沸丁酮不可溶级分大于95%,经13CNMR分析该级分为间规聚苯乙烯.

关键词: 间规聚苯乙烯, 甲基铝氧烷, 苯乙烯间规聚合, 茂金属催化剂

Abstract: Syndiotactic polystyrene was synthesised with metallocene catalysts activated bymethylaluminoxane(MAO) and trimethylaluminum (TMA).The catalytic efficlency (C.E.)for syndiospecific styrene polymerization was compared with different η5-cyclopentadi-enyltrialkoxy titanium [CpTi (OR)3].η5-Cyclopentadienyltripropoxy titanium [CpTi (O-n-Pr)3]/MAO/TMAcatalyst has a exceedingly high value of C.E.=4 × 104 g PS.(g Ti)-1.The catalytic efficiency of the catalyst and the molecular weight and syndiospecificity ofpolystyrene were affected by catalyst composition and concentration, monomer concentra-tion, polymerization temperature and time.The optlum conditions of polymerization ofstyrene for [CpTi(O-n-Pr)3]/MAO/TMAcatalyst are Al/Ti (molar ratio)=1000, tempera-ture about 60 C, high styrene concentration (>2.4 mol/L) and c(Ti)=0.14 mmol/Lformaximum activity or c(Ti)=O.18 mmol/Lfor maximum yield- The sPSwas separated frompolymerization product by extraction with boiling butanone for 8 h, the yield of sPSover95 %.

Key words: Syndiotactic polystyrene, Methylaluminoxane, Syndiospecific polymerization ofstyrene, Metallocene catalyst

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