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Ring-opening polymerization of ε-caprolactone (CL) catalyzed bylanthanocenes, O(C_2H_4C_5H_3CH_3)_2YCl (Cat-YCl) and Me_2Si[(CH_3)_3SiC_5H_3]_2NdCl(Cat-NdCl) has been carried out for the first time. It has been found that both yttroceneand neodymocene are very efficient to catalyze the polymerization of CL, giving high molec-ular weight poly (ε-caprolactone) (PCL ). The effects of [cat] / [ε- CL] molar ratio, polymeriza-tion temperature and time, as well as solvents were investigated and polymerization tem-perature is found to be the most important factor affecting the polymerization. The bulkpolymerization gives higher molecular weight PCL and higher conversion than that in solu-tion polymerization. NaBPh_4 was found to promote the polymerization of ε-caprolactone,and thus to increase both the polymerization conversion and MW of poly (ε- caprolactone ). 相似文献
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Y(AcAc)3/n—BuMgCl络合催化ε—己内酯本体聚合 总被引:3,自引:0,他引:3
应用稀土乙酰基丙酮盐[Y(AcAc)3]与格氏试剂(n-BuMgCl)络合催化ε-己内酯聚合。研究了单体与催化剂摩尔化、助催化剂用量、温度、时间及第三组份等条件对聚合反应的影响。结果表明,该催化体系具有较好的反应活性。增加助催化剂用量或选择合适的第三组份如二甲基亚砜能有效地提高单体转化率与聚合物分子量。分子量分布为2.1。X-衍射分析表明聚己内酯为结晶性聚合物。 相似文献
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This article deals that the rare earth metal complexes along with Al(i'-Bu),can catalyze the polymerization of methyl-methacrylate (MMA) into high molecular weight poly(MMA) along with narrow molecular weight distributions (MWD).A typical example was mentioned in the case of {Cp(Cl) Sm-Schiff-base(THF)} which expresses maximum (conv.% = 55.46 and Mn=354×103) efficiency along with narrow MWD (Mw/Mn<2) at 60℃.The resulting polymer was partially syndiotactic (>60%).The effect of the catalyst,temperature,catalyst/MMA molar ratio,catalyst/Al( i-Bu)3 molar ratio on the polymerization of MMA at 60℃ were also investigated. 相似文献
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Ln(acac)3—BuMgCl催化甲基丙烯酸甲酯聚合 总被引:2,自引:0,他引:2
开发了催化甲基丙烯酸甲酯聚合的一类新型催化剂,由稀土乙酰基丙酮配合物Ln(acac)3和格氏试剂BuMgCl组成.研究了不同稀土元素、催化剂陈化时间和温度、溶剂、CCl4添加剂、聚合时间和温度的影响.结果表明,在石油醚中单体聚合转化率和聚合物相对分子质量高于芳烃和其它极性溶剂,过量BuMgCl可能起链转移作用,降低温度可提高聚合物的间同含量. 相似文献
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