Abstract
The effects of adding cosolvents of diglyme and 15-crown-5 to the reaction mixture of Wurtz-type coupling of dichlorosilanes on the yield and relative molecular mass dispersity of polymethylphenethylsilane(PMPES) were discussed. The results show that addition of 10% (volume ratio of diglyme to toluene) diglyme as a cosolvent to the reaction mixture leads to the yield increase of PMPES with a monomodal distribution of relative molecular masses. Adding 10% diglyme to the reaction mixtures, the yields of polymethylcyclohexylsilane(PMCS) and copolymers (polymethylphenethylsilane-co-methylcyclohexylsilane), (the molar ratios of methylphenethyldichlorosilane to methylcyclohexyldichlorosilane were 2.0, 1.0 and 0.5, and the copolymers were abbreviated by Copolymers I, II, III, respectively) are 47%, 52%, 54%, 53%, respectively. Their relative molecular masses \((\bar M_w )\)almost reach 105. These polysilanes were characterized by 1H-NMR, IR and UV absorption spectrum.
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Foundation item: The National Natural Science Foundation of China (No. 28970817)
Biography of the first author: HU Hui-ping, doctoral student, born in 1969, majoring in applied chemistry.
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Hu, Hp., Huang, Kl., Pan, Cy. et al. Study on syntheses and characterizations of polymethylphenethylsilane, polymethylcyclohexylsilane and their copolymers. J Cent. South Univ. Technol. 7, 92–96 (2000). https://doi.org/10.1007/s11771-000-0040-x
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DOI: https://doi.org/10.1007/s11771-000-0040-x