期刊
CHEMSUSCHEM
卷 11, 期 1, 页码 149-158出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701930
关键词
coating; high molecular weight; isocyanate-free; n-alkylation; polyurea
资金
- Dutch Polymer Institute (DPI) [759]
Here, an isocyanate-free approach to produce polyureas from diamines and dicarbamates as monomers is reported. A side reaction limiting the molecular weight during the diamine/ dicarbamate polymerization, that is, N-alkylation of amine end groups, is investigated. Mitigation of the N-alkylation, either by enhancing the carbamate aminolysis rate or by substitution of dimethylcarbamates with more sterically hindered diethylcarbamates, affords polyureas with sufficiently high molecular weights to assure satisfactory mechanical properties. Stable polyurea dispersions with polyamines as internal dispersing agents are prepared, and the properties of the corresponding coatings are evaluated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据