摘要
用聚苯乙烯（ＰＳ）负载ＳｂＣｌ３得到大分子催化剂ＰＳ－ＳｂＣｌ３，研究了ＰＳ－ＳｂＣｌ３／ＡｌＣｌ３复合体系对α－蒎烯阳离子聚合的催化性能。结果表明，与直接用ＳｂＣｌ３与ＡｌＣｌ３复合相比，ＰＳ－ＳｂＣｌ３／ＡｌＣｌ３体系催化α－蒎烯聚合，在保持较高单体转化率的同时，使聚合反应变缓，避免了由于反应过快而引起的聚合产物中二聚体含量上升，Ｍｎ下降的现象。如采用大孔ＰＳ－ＳｂＣｌ３／ＡｌＣｌ３体系，在较高温度（０℃）下甲苯中，可获得Ｍｎ高达９２０、二聚体含量仅为６．３％的固态α－蒎烯树脂。还研究了载体ＰＳ的孔结构（微孔性和大孔性）对催化性能的影响。发现两者的反应速率、产物结构及聚合反应与温度的依赖关系明显不同。
SbCl 3 was loaded on crosslinked polystyrene beads to give polymer supported catalysts PS SbCl 3. Then, α pinene was cationicly polymerized with PS SbCl 3/AlCl 3. A solid resin of α pinene with relatively high molecular weight ( n=920) and low dimer content (6 mass%) was obtained in good yield (￣90%) with the macroporous polystyrene supporter (40 mol% DVB) in toluene at 0 ℃. Phenomenologically, the role of the polymeric supporter is to retarted the polymerization with SbCl 3/AlCl 3, by the controlled releasing of SbCl 3, so as to proceed at a moderate rate even at high temperature 0 ℃ and thereby to suppress the dimer formation.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1997年第5期21-25,共5页
Polymer Materials Science & Engineering
基金
国家教委留学归国人员科研基金
国家自然科学基金
关键词
蒎烯
阳离子聚合
聚苯乙烯
氯化锑
氯化铝
α pinene, cationic polymerization, polystyrene supported SbCl 3 catalyst, AlCl 3
