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CLC number: O632.52

On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 0000-00-00

Cited: 17

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Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2000 Vol.1 No.2 P.157-161

http://doi.org/10.1631/jzus.2000.0157


THE POLYMERIZATION OF METHYL METHACRYLATE WITH A NEW TIN-BRIDGED YTTROCENE/Al(i-Bu)3


Author(s):  HU Wei-qiu, SUN Jun-quan, PAN Zhi-da, WU Zhao-li, XU Yu-ming

Affiliation(s):  Dept.of Chemical Engineering, Yuquan Campus of Zhejiang University,Hangzhou 310027, China; more

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Key Words:  rare earth catalyst, yttrocene, heteronuclear metallocene, polymerization, methyl methacrylate, kinetics, lanthanocene


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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.

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