Synthesis and Anionic Polymerization of Isocyanates Bearing a Carbamate Group
Synthesis and Anionic Polymerization of Isocyanates Bearing a Carbamate Group
复制标题
带有氨基甲酸酯基团的异氰酸酯的合成和阴离子聚合
DOI：
10.1295/polymj.29.333
复制
发表时间：
1997
期刊：
影响因子：
2.8
通讯作者：
Y. Okamoto
中科院分区：
文献类型：
--
作者：
Katsuhiro Maeda;M. Matsunaga;H. Yamada;Y. Okamoto
带有氨基甲酸酯基团的新型异氰酸酯，6-(丁氧基羰基氨基)己基异氰酸酯(nBAHI)、6-((S)-(+)-s-丁氧基羰基氨基)己基异氰酸酯((+)-BAHI)和4-((S)-(+)-s-丁氧基羰基氨基)丁基异氰酸酯 ((+)-BABI)，通过二异氰酸酯与醇反应合成，并与各种阴离子引发剂在THF中在-98°C下聚合。聚合反应得到主要由1-尼龙结构组成的可溶性聚合物。聚(+)-BAHI)和聚(+)-BABI)的圆二色光谱图与光学活性螺旋聚(烷基异氰酸酯)相似，表明聚(+)-BAHI)和聚(+)-BABI)的旋光度主要由聚合物链的主要螺旋度决定。侧基中的手性中心与聚合物主链被十个或八个σ键分开，似乎通过分子内效应影响聚合物的螺旋方向。
New isocyanates bearing the carbamate group, 6-(butoxycarbonylamino)hexyl isocyanate (nBAHI), 6-((S)-(+)-s-butoxycarbonylamino)hexyl isocyanate ((+)-BAHI), and 4-((S)-(+)-s-butoxycarbonylamino)butyl isocyanate ((+)-BABI), were synthesized by reaction of a diisocyanate with an alcohol and polymerized with various anionic initiators in THF at −98°C. The polymerization afforded soluble polymers mainly consisting of a 1-nylon structure. The CD spectral patterns of poly((+)-BAHI) and poly((+)-BABI) were similar to those of optically active helical poly(alkyl isocyanate)s, indicating that the optical rotation of poly((+)-BAHI) and poly((+)-BABI) is determined mainly by the prevailing helicity of the polymer chain. The chiral center in the side group separated by ten or eight σ-bonds from the polymer main chain appears to influence the helical sense of the polymer through intramolecular effect.
顾红：“聚（R）-2-氘代正己基异氰酸酯）大分子旋光度的分子量依赖性”。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--