NDLI: Synthesis, characterization and application of a novel carbon bridged half-metallocene chromium catalyst for methyl methacrylate polymerization

Content Provider	Springer Nature Link
Author	Cheng, Zhengzai Gong, Kai Wang, Yang Zhou, Xue Zhang, Weixing Li, Yin Sun, Junquan Li, Wenbing
Copyright Year	2014
Abstract	A new carbon bridged cyclopentadienyl chromium complex of the type [(C$_{5}$H$_{4}$)C(CH$_{3}$)$_{2}$ CH$_{2}$(C$_{5}$H$_{4}$N)]CrCl$_{2}$ was prepared by treatment of CrCl$_{3}$·(THF)$_{3}$ in THF solution with the lithium salt of ligand containing cyclopentadienyl and pyridyl groups. The chromium complex was characterized by $^{1}$H NMR and elemental analysis(EA), and the crystal structure was determined by X-ray diffraction analysis. Activated by Al(i-Bu)$_{3}$, the chromium complex displayed a very high activity for methyl methacrylate (MMA) polymerization. After 24 hours,more than 95.5% MMA was converted to polymethyl methacrylate (PMMA) with a viscosity average molecular weight (W $_{η}$) of 416000 g·mol$^{−1}$ at 60 °C for MMA/Al(i-Bu)$_{3}$/chromium catalyst molar ratio of up to 2000:20:1. Effects of temperature, molar ratios of MMA/catalyst and catalyst/cocatalyst on the polymerization have been studied. The high conversion of MMA and high molecular weight of PMMA with narrow molecular weight distribution is caused by the unique stable active site formed by the new chromium complex and aluminum cocatalyst.
Starting Page	1294
Ending Page	1301
Page Count	8
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	29
Issue Number	6
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2014-12-18
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	metallocene catalyst carbon bridged half-metallocene chromium crystal structure MMA polymerization PMMA Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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