Polymerization of Methyl Methacrylate with a Novel Carbon Bridged Cyclopentadienyl Chromium Complex

Abstract:

A new carbon bridged cyclopentadienyl chromium complex of the type [ (C5H4)C(CH3)2 CH2(C5H4N) ]CrCl2 was prepared by treatment of CrCl3•(THF) 3 in THF solution with the lithium salt of ligand with cyclopentadienyl and pyridyl group. The chromium complex was characterized by mass spectra and elemental analysis. Activated by Al(i-Bu) 3, the chromium complex displayed a very high activity for methyl methacrylate (MMA) polymerization. After 18 hours, 85.49 % MMA was converted to polymethyl methacrylate (PMMA) with a viscosity average molecular (Mv) of 328000 at 60 °C at MMA/ Al(i-Bu) 3/chromium complex of 2000:20:1 in MMA bulk. The high conversion of MMA and high molecular weight of PMMA are the cause of the unique stable active site formed by the new chromium complex and cocatalyst.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 517-521
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.517
• Online since: February 2011
• Authors: Zheng Zai Cheng, Xiao Chao Yan, Yu Jing Nie, Rui Lei, Su Su Lin
• Keywords: Cyclopentadienyl Chromium, Methylmethacrylate, Poly(methyl methacrylate) (PMMA), Polymerization

References

[1] H. Yasuda, H. Yamamoto and K. Yokota: J. Am. Chem. Soc. Vol. 114 (1992), P. 4908.

[2] C. Qian, W. Nie. and J. Sun: Organometallics Vol. 645( 2002), P. 82.

[3] C. Qian,W. Nie and J. Sun: Organometallics Vol. 19(2000) , P. 4134.

[4] J. Sun, Z. Pan and Y. Zhong: Euro. Polym. J. Vol. 36(2000), P. 2375.

[5] S. Xu, X. Deng and B. Wang: Macromol. Rapid Commun. Vol. 22 (2001), P. 708.

[6] W. Herwig and H. H. Zeiss: J. Org. Chem. Vol. 23(1958),P. 1404.

[7] Z. Cheng, J. Sun and Y. Nie: J. Wuhan Univ. Tech-Mater. Sci. Ed Vol. 21(2006),P. 50.