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《高分子科学(英文版)》 2018-02
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Synthesis of Hydroxy-functionalized Ultrahigh Molecular Weight Polyethylene Using Fluorenylamidotitanium Complex

Xiang-Yang Song;Qiong Ma;Hao-Bo Yuan;Zheng-Guo Cai;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University;  
Copolymerizations of ethylene and 1-dodecene were conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, [t-BuNSiMe_2Flu]TiMe_2(1a), [t-BuNSiMe_2(2,7-~tBu_2Flu)]TiMe_2(1 b), and [(1-adamantyl)NSiMe_2(2,7-~tBu_2Flu)]TiMe_2(1c) activated by modified methylaluminoxane. The activity increased by the introduction of the alkyl groups on the fluorenyl and amido ligands, and 1c produced the highest molecular weight copolymers. Complex 1c also promoted copolymerization of ethylene and ~iBu_3 Al protected 10-undecen-1-ol with high activity(~2000 kg·mol~(-1)·h~(-1)), affording hydroxy-functionalized ultrahigh molecular weight polyethylene. The hydroxy content of the copolymers obtained was controllable by changing comonomer feed ratio. The introduction of a small amount of hydroxy group can alter the surface properties of polyethylene.
【Fund】: financially supported by the National Natural Science Foundation of China (No. 21174026);; Program for New Century Excellent Talents in University;; the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning;; “Shu Guang” project supported by Shanghai Municipal Education Commission;; Shanghai Education Development Foundation;; the Fundamental Research Funds for the Central Universities (No. CUSF-DH-D-2017041)
【CateGory Index】: O641.4
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