Several new photo-responsive polyamides containing norbornadiene (NBD) residue in the main chain were synthesized by the polycondensation of 2,5-NBD-2,3-dicarboxylic acid (NDC) with diisocyanates. From a polycondensation without catalyst in sulfolane at 80 degrees C for 24 h, NBD polyamide having a number average molecular weight of (M(n))=11000 was obtained. In the reaction using various catalysts, however, it was found that the molecular weight of the resulting polymer did not increase. The reaction was investigated in various solvents without catalyst. The reaction proceeded very smoothly in dimethyl sulfoxide (DMSO) at room temperature to give the corresponding polymer with M(R)=8000. When the reaction was carried out in DMSO at 100 degrees C, the polymer having the highest molecular weight (M(n)=20000) was obtained. Various NBD polyamides were also prepared by the reaction of NDC with certain diisocyanates under similar conditions.
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Yokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, JapanYokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan
Sampei, M
Hiramatu, K
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Yokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, JapanYokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan
Hiramatu, K
Kameyama, A
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Yokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, JapanYokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan
Kameyama, A
Nishikubo, T
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Yokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, JapanYokohama City Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan
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Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
Park, Minwook
Campos, Jesus Guillen
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Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
Campos, Jesus Guillen
Stricker, Friedrich
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Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
Stricker, Friedrich
de Alaniz, Javier Read
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Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
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Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
Wang, Huai-Zhen
Chow, Hak-Fun
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Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
Chinese Univ Hong Kong, Ctr Novel Funct Mol, Shatin, Hong Kong, Peoples R ChinaChinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China