Synthesis and characterization of titanium complexes bearing sulfoxide groups and their catalytic behaviors in ethylene homo- and copolymerization
作者:Zheng Wang、Ai-Qing Peng、Xiu-Li Sun、Yong Tang
DOI:10.1007/s11426-014-5137-4
日期:2014.8
Titanium complexes derived from 2,4-di-tert-butyl-6-((2-(arylsulfinyl)phenylimino)methyl)phenol are designed and synthesized. X-ray diffraction studies reveal that the complexes adopt distorted octahedral geometry with O(phenol), N(imine), and O(sulfoxide) coordinated with titanium. Combined with modified methylaluminoxane(MMAO), the complexes exhibit moderate to high activity to afford polyethylene even at 120 °C under 1 atm ethylene pressure. The complexes also show excellent capability in copolymerization of ethylene with either 1-hexene or norbornene. Results indicate that the introduction of sulfoxide groups could open the space around central metal and favors the insertion of bulky comonomers.
设计并合成了源自 2,4- 二叔丁基-6-((2-(芳基亚磺酰基)苯基亚氨基)甲基)苯酚的钛配合物。X 射线衍射研究显示,这些配合物采用扭曲的八面体几何结构,O(苯酚)、N(亚胺)和 O(亚砜)与钛配位。这些配合物与改性甲基铝氧烷(MMAO)结合在一起,显示出中等到较高的活性,即使在 120 ℃、1 个大气压的乙烯压力下也能生成聚乙烯。这些配合物在乙烯与 1-己烯或降冰片烯的共聚中也表现出卓越的能力。结果表明,亚砜基团的引入可以打开中心金属周围的空间,有利于大体积共聚物的插入。