Novel titanium(IV) diolate complexes with additional O‐donor as precatalyst for the synthesis of ultrahigh molecular weight polyethylene with reduced entanglement density: Influence of polymerization conditions and its implications on mechanical properties
作者:Vladislav A. Tuskaev、Svetlana Ch. Gagieva、Dmitrii A. Kurmaev、Vyacheslav S. Bogdanov、Kasim F. Magomedov、Elena S. Mikhaylik、Evgenii K. Golubev、Mikhail I. Buzin、Galina G. Nikiforova、Viktor G. Vasil'ev、Viktor N. Khrustalev、Pavel V. Dorovatovskii、Artem V. Bakirov、Maksim А. Shcherbina、Pavel B. Dzhevakov、Boris M. Bulychev
DOI:10.1002/aoc.6256
日期:2021.7
New alkoxo-titanium(IV) complexes with diolate ligand containing additional donor oxygen atom have been synthesized from readily available and scalable precursors. The structure of complex 4 was established by X-ray diffraction. Titanium atom adopts a distorted tetrahedral geometry formed by six oxygen atoms of ligands. The resulting complexes 3–4 are moderately or highly active in ethylene polymerization
新的烷氧基钛 (IV) 配合物与含有额外供体氧原子的二醇配体已经从容易获得且可扩展的前体合成。配合物4的结构由X射线衍射确定。钛原子采用由六个氧原子配位体形成的扭曲四面体几何结构。在 Et n AlCl 3– n + Bu 2存在下,所得配合物3 – 4在乙烯聚合中具有中等或高度活性Mg}二元助催化剂。研究了溶剂的性质、有机铝助催化剂和聚合温度对催化体系活性的影响,以及所得聚合物的性能。得到的聚合物是超高分子量的线性聚乙烯(高达 5.8·10 6 g mol -1) 具有广泛的分子量分布。这些聚合物适用于现代聚合物加工方法——超高强度(断裂强度高达 2.8 GPa)和高模量(弹性模量高达 140 GPa)取向薄膜和薄膜带的无溶剂固态成型。显示了在不显着降低催化系统的生产率和聚合物性能的情况下扩大超高分子量聚乙烯 (UHMWPE) 合成的可能性。已通过小角 X 射线散射 (SAXS) 方法研究了