Polymerizationn of Vinyl Compounds by Dihydridotetrakis-(triphenylphosphine)ruthenium(II)
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概要
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Dihydridotetrakis(triphenyIphosphine)ruthenium(II) <B>1</B> initiates the polymerization of α-substituted olefins of high <I>e</I>-values such as acrylonitrile and forms unstable complexes with olefins of low <I>e</I>-values. Molecular weight of the polymer obtained by the polymerization of acrylonitrile with <B>1</B> was independent of polymerization time and increased linearly with the monomer concentration. The rate of polymerization was measured by a dilatometry and compared with the rate of decomposition of <B>1</B> in the presence of acrylonitrile followed by a spectroscopic method. The rate of decomposition of <B>1</B> was found to be equivalent to the rate of initiation of polymerization and can be expressed by the following equations:<BR>-\fracddt[Ru]=k[Ru], \frac1k=A+{B+C[PPh_3]}/[monomer] <BR>On the basis of the kinetic results and the independence of molecular weight of the polymer on time, a mechanism involving a slow initiation step followed by rapid propagation and termination steps is proposed.
- 公益社団法人 日本化学会の論文
著者
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Ikeda Sakuji
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Yamamoto Akio
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Komiya Sanshiro
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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