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采用含有分子内配位Ln←O键、茂(茚)和环辛四烯(COT)混合配体的稀土有机化合物与三乙基铝体系催化甲基丙烯酸甲酯(MMA)的聚合,可以得到高分子量(Mη>100×103),窄分子量分布(Mw/Mn<3)的聚甲基丙烯酸甲酯(PMMA).不同的配体及稀土元素可以影响这类稀土有机化合物的催化聚合活性.化合物(η5-MeOCH2CH2C5H4)Nd(η8-C8H8)(THF)具有较高的活性(转化率91.0%,Mη=115.2×103).考察了催化剂和助催化剂浓度,以及聚合温度和时间对(η5-cyclo-C4H7OCH2C9H6)Dy(η8-C8H8)/AlEt3体系催化聚合反应的影响.结果表明,最佳聚合条件为: n(MMA)∶n(催化剂)∶n(助催化剂)=1200∶1∶5,θ=60 ℃,t=32 h.利用核磁共振和凝胶渗透色谱等技术对聚合物进行了表征.

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