Copolymerizations of ethylene and polar comonomers with bis(phenoxyketimine) group IV complexes: Effects of the central metal properties |
| |
Authors: | Xiaofan Zhang Shangtao Chen Huayi Li Zhicheng Zhang Yingying Lu Chunhong Wu Youliang Hu |
| |
Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China;2. Graduate School, Chinese Academy of Sciences, Beijing, 100039, China;3. Department of Chemistry, Wuhan University, Wuhan, 430072, China;4. Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, ChinaBeijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China |
| |
Abstract: | With triisobutylaluminum as a protection reagent, copolymerizations of ethylene with 10‐undecen‐1‐ol, 10‐undecenoic acid, and 5‐hexen‐1‐ol have been performed with bis[(3,5‐di‐tBu? C6H2? 2‐O)? PhC?N(2‐F? C6H4)]ZrCl2 ( a )/methylaluminoxane or bis[(3,5‐di‐tBu? C6H2? 2‐O)? PhC?N(2‐F? C6H4)]TiCl2 ( b )/methylaluminoxane as the catalyst. Both catalysts exhibit high activities of copolymerization in the presence of polar groups. The properties of the copolymers are strongly affected by the central metal properties of the catalysts. In comparison with complex a , titanium complex b appears to be less sensitive to polar monomers and more favorable for the preparation of higher molecular weight functionalized polyethylenes containing higher contents of polar groups. Studies on the polymerization temperature indicate that the catalytic activities decrease greatly with both complex a and complex b . The comonomer contents incorporated into the copolymers are slightly dependent on the polymerization temperature in the case of complex a , whereas in the case of complex b , the effect of the polymerization temperature is more distinct: an increase in the polymerization temperature can efficiently facilitate the incorporation of polar comonomers. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 59–68, 2007 |
| |
Keywords: | copolymerization functionalization of polymers phenoxy‐based titanium catalysts polar monomers polyethylene (PE) |
|
|