Manabu Ishifune, Chika Sana, Misako Ando
Feb 5, 2010
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0
Influential Citations
6
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Journal
Polymer International
Abstract
The electroreductive polymerization of dichloromethylphenylsilane in the presence of triphenylsilyl group-containing disilanes such as hexaphenyldisilane followed by the electroreductive termination with chlorotriphenylsilane afforded triphenylsilyl group-terminated polymethylphenylsilane in 15–32% yield. The isolated polymethylphenylsilane (Mn = 3350 g mol−1, Mw/Mn = 1.4) was found to react as a macroinitiator to copolymerize with dibutyldichlorosilane under electroreductive conditions producing the corresponding block copolymer (Mn = 4730 g mol−1, Mw/Mn = 1.2) in 38% yield. The ratio of monomer units (MeSiPhtoBuSiBu) of the copolymer was determined to be 75:25 using 1H NMR analysis, which was in good agreement with the calculated ratio (74:26) on the assumption that molecular weight of the macroinitiator was not changed. The block structure of the resulting copolymer, poly(methylphenylsilane)-block-poly(dibutylsilane), was also confirmed by comparing its 1H NMR and UV absorption spectra with those of polymethylphenylsilane, polydibutylsilane and a statistical copolymer prepared by electroreductive polymerization of dichloromethylphenylsilane with dibutyldichlorosilane. This method is applicable to the preparation of other types of macroinitiator such as triphenylsilyl group-terminated polydibutylsilane, and polydibutylsilane-block-polymethylphenylsilane was also obtained using this macroinitiator. Copyright © 2011 Society of Chemical Industry