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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2001, Vol. 2 Issue (4): 366-371    DOI: 10.1631/jzus.2001.0366
Engineering Sciences     
POLYMERIZATION OF METHYL METHACRYLATE WITH ETHYLENE BRIDGED HETERODINUCLEAR METALLOCENE OF SAMARIUM AND TITANIUM—STUDY ON SYNERGISM AND KINETICS
SUN Jun-quan, PAN Zhi-da, HU Wei-qiu, YANG Shi-lin
College of Material Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  Comparison of MMA polymerization results with samarocene chloride, titanocene chloride and the title heterodinuclear (Sm-Ti) catalyst, respectively, showed synergism in the Sm-Ligand-Ti system, which obviously influenced the polymerization behaviors, for example, of yielding higher activity and higher molecular weight polymer. Kinetic studies on polymerization of MMA with ethylene bridged samarocene and titanocene chloride/M(i-Bu)3 showed that the polymerization rate was first-order on the catalyst concentration, and 1.9-order on the monomer. The overall activation energy measured was 52.8 kJ/mol.

Key words： heterodinuclear metallocene      heterodinuclear synergism      methyl methacrylate      polymerization      kinetics      titanocene      lanthanocene     
Received: 21 November 2000     
CLC:  O632.52  
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PAN Zhi-da
SUN Jun-quan
HU Wei-qiu
YANG Shi-lin
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SUN Jun-quan, PAN Zhi-da, HU Wei-qiu, YANG Shi-lin. POLYMERIZATION OF METHYL METHACRYLATE WITH ETHYLENE BRIDGED HETERODINUCLEAR METALLOCENE OF SAMARIUM AND TITANIUM—STUDY ON SYNERGISM AND KINETICS. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2001, 2(4): 366-371.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2001.0366     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2001/V2/I4/366

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