• 综述 •
牟泽怀, 王银军, 谢鸿雁. 稀土金属配合物催化芳香型乙烯基极性单体立构选择性聚合[J]. 化学进展, 2020, 32(12): 1885-1894.
Zehuai Mou, Yinjun Wang, Hongyan Xie. Rare-Earth Metal Complexes-Mediated Stereoselective Polymerization of Aromatic Polar Vinyl Monomers[J]. Progress in Chemistry, 2020, 32(12): 1885-1894.
鉴于聚合物的立构规整度对其性能起着重要的作用,如何提高聚合物的立构规整度一直以来都是配位聚合领域的重要研究课题。经过几十年的发展,配位聚合已经在 α-烯烃、苯乙烯、共轭二烯烃等非极性烯烃单体的立构选择性聚合方面取得了巨大的成就。但非极性聚烯烃材料表面性能差,而化学性质稳定,难以被后功能化。因此通过极性单体的立构选择性聚合将极性基团引入聚烯烃大分子链中对于提高其性能具有非常重要的意义。然而,在传统的配位聚合中,单体上的极性原子(基团)易于向金属中心配位,导致催化体系失去立构选择性,甚至失去活性。因此选择合适的配体、金属种类与极性单体组合的策略对实现立构选择性聚合至关重要。近年来,针对2-乙烯基吡啶、含杂原子苯乙烯衍生物以及硼氮杂芳香型乙烯基单体的定向聚合,开发了大量的稀土金属配合物催化体系,聚合物的立构规整度取得了较大的突破,同时对单体上极性原子在聚合中的作用也有了新的认识。本综述以单体种类为主线,详细讨论了配体的结构、取代基的电子效应、空间位阻效应、中心稀土金属种类和聚合溶剂等对催化剂聚合活性、立构选择性的影响,并探讨可能的聚合反应机理。
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