| 聚丁二烯基锂/三异丁基铝引发苯乙烯阻滞负离子聚合 |
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| 引用本文： | 王翠华,鲁建民,程虎,韩丙勇,吴一弦.聚丁二烯基锂/三异丁基铝引发苯乙烯阻滞负离子聚合[J].石油化工,2011,40(5):522-526. |
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| 作者姓名： | 王翠华 鲁建民 程虎 韩丙勇 吴一弦 |
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| 作者单位： | 化工资源有效利用国家重点实验室北京化工大学材料科学与工程学院,北京,100029 |
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| 基金项目： | 国家自然科学基金项目50973004,20934001) |
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| 摘 要： | 以聚丁二烯基锂(PBLi)为引发剂、i-Bu3Al为调节剂、环己烷为溶剂,在70～120℃下引发苯乙烯聚合,研究了n(i-Bu3Al)∶n(PBLi)对阻滞苯乙烯聚合行为的影响;并用NMR方法对反应的聚合动力学进行了研究。实验结果表明,加入i-Bu3Al时体系的聚合反应速率降低,n(i-Bu3Al)∶n(PBLi)越大,聚合反应速率越慢,甚至反应完全停滞;当n(i-Bu3Al)∶n(PBLi)=1.0、反应温度由90℃升至120℃时,聚合反应速率大幅加快,1.5 h内苯乙烯转化率达到90%以上。当n(i-Bu3Al)∶n(PBLi)较小时,两者可能形成较高活性的1∶2络合体;当n(i-Bu3Al)∶n(PBLi)较大时可能形成低活性的1∶1络合体,且1∶2络合体自身及其与1∶1络合体之间均存在构型转换。
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| 关 键 词： | 聚丁二烯基锂 三异丁基铝 阻滞负离子聚合 苯乙烯 |
Retarded Anionic Polymerization of Styrene Initiated by Polybutadiene Lithium/i-Bu3 Al |
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| Wang Cuihua,Lu Jianmin,Cheng Hu,Han Bingyong,Wu Yixian.Retarded Anionic Polymerization of Styrene Initiated by Polybutadiene Lithium/i-Bu3 Al[J].Petrochemical Technology,2011,40(5):522-526. |
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| Authors: | Wang Cuihua Lu Jianmin Cheng Hu Han Bingyong Wu Yixian |
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| Affiliation: | Wang Cuihua,Lu Jianmin,Cheng Hu,Han Bingyong,Wu Yixian(State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China) |
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| Abstract: | The retarded anionic polymerization of styrene initiated by polybutadiene lithium(PBLi)/i-Bu3Al at 70-120 ℃ in cyclohexane was investigated.The results showed that the polymerization reaction slowed down to complete stagnation with increasing n(i-Bu3Al) ∶ n(PBLi) from 0.3 to 1.0.The polymerization rate increased rapidly with rise of the reaction temperature at n(i-Bu3Al) ∶n(PBLi) 1.0.It was indicated that 1 ∶ 2 i-Bu3Al/PBLi complex probably formed at low n(i-Bu3Al) ∶ n(PBLi),which could promote the styrene polymerization at 90 ℃.At high n(i-Bu3Al) ∶ n(PBLi),1 ∶ 1 complex formed and the polymerization rate was considerable just at high temperature(higher than 100 ℃).The reactive activity of the former was higher than the latter and the transformation between them or among 1 ∶ 2 complex might exist. |
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| Keywords: | polybutadiene lithium triisobutyl aluminum retarded anionic polymerization styrene |
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