CRCU

Chemical Research in Chinese Universities ›› 1997, Vol. 13 ›› Issue (4): 344-349.

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The Polymerization of Methyl Methacrylate with a New Nd(O——i-Pr)3—AI( i-Bu)3 Catalyst System

SUN Jun-quan   

  1. 1. Dept. of Polym. Sci. and Engineering, Zhejiang University, Hangzhou 310027;
    2. The laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry, Academia Sinicia, Changchun 130022
  • Received:1996-08-29 Online:1997-12-24 Published:2011-08-17
  • Supported by:

    Supported by theNationalNatural Science Foundation of China.

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Abstract: Methyl methacrylate (MMA) was polymerized with the rare earth coordination catalyst system of Nd(O——i-Pr)3 in toluene. The influences of various ligands in neodymium complexes, molar ratio of Al/Nd, catalyst concentration, catalyst aging time, solvents, the third component CCl4, temperature and time on the polymerization of MMA were studied. The results showed that the polymerization conversion reached more than 80% at a catalyst concentration of 9.2×10-3 mol/L. The appropriate molar ratio of CCl4/Nd was 4. Hydrocarbon was preferred for the polymerzation to obtain a high conversion and a highMW of PMMA. The 1H NMR spectra of PMMA indicated that the lower the temperature, the higher the syndiotactic content of PMMA was obtained.

Key words: Rare earth catalyst, Neodymium catalyst, Neodymium triisopropoxide, Coordination catalyst, Polymerization, Methyl methacrylate