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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2000, Vol. 1 Issue (2): 157-161    DOI: 10.1631/jzus.2000.0157
Science & Engineering     
THE POLYMERIZATION OF METHYL METHACRYLATE WITH A NEW TIN-BRIDGED YTTROCENE/Al(i-Bu)3
HU Wei-qiu, SUN Jun-quan, PAN Zhi-da, WU Zhao-li, XU Yu-ming
Dept.of Chemical Engineering, Yuquan Campus of Zhejiang University,Hangzhou 310027, China; National Laboratory of Element-Organic Chemistry, Nankai University,Tianjin 300071, China
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Abstract  A new catalyst composed of Tin-bridged yttrocene Ph2Sn(MeCp)2YCl (MeCp=methylcyclopentadienyl) and Al(i-Bu)3 was successfully developed for the polymerization of methyl methacrylate(MMA). Detailed study of factors (such as the molar ratio of Al/Cat., catalyst concentration, various solvents, temperature and time) influencing polymerization reaction indicated that the catalytic active species may be still somewhat stable at high temperature and still have a long catalytic lifetime. 1H NMR spectrum showed about 65% syndiotactic content in the polymethyl methacrylate(PMMA) prepared. From kinetic studies, the polymerization rate equation may be expressed as Rp=Kp[Cat.]2.4. The overall activation energy of polymerization is 20.9±3.1 kJ/mol.

Key words： rare earth catalyst      yttrocene      heteronuclear metallocene      polymerization      methyl methacrylate      kinetics      lanthanocene     
Received: 30 April 1999     
CLC:  O632.52  
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HU Wei-qiu
SUN Jun-quan
PAN Zhi-da
WU Zhao-li
XU Yu-ming
Cite this article:

HU Wei-qiu, SUN Jun-quan, PAN Zhi-da, WU Zhao-li, XU Yu-ming. THE POLYMERIZATION OF METHYL METHACRYLATE WITH A NEW TIN-BRIDGED YTTROCENE/Al(i-Bu)3. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2000, 1(2): 157-161.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2000.0157     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2000/V1/I2/157

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