摘要
用NMR研究了六次甲基二异氰酸酯与水的加成产物N-100的结构.结果表明:N-100中含有脲基、缩二脲基、双缩二脲基、三聚体异氰脲基、异氰酸酯和氨基等基团,是一种以氢原子为交联点、胺和异氰酸酯为端基的具有复杂网络结构的多异氰酸酯.一维核磁谱及二维化学位移相关谱不但分辨出4种羰基,还确定了氮上5种不同取代结构的分子链连接情况.通过建立理论模型,准确地定量描述了N-100的网络结构.
To improve the mechanics properties of polyurethane materials at a high or low temperature, a hydroxy compound N-100 of HDI was synthesized. The structure analysis and characterization were made by NMR (1H, 13C, 1H-1H COSY, 13C-1H COSY ). In addi-tion, quantitative description of the network was made on the basis of some ideal assump-tions. 1D and 2D NMR can differentiate four sorts of carbonyl groups and establish the con-nections of all carbon and hydrogen atoms of mixed structures that originated from five dif-ferent substitutions. Besides, the alkene and isocyanate, urea, biuret and trimerized isocya-nuric groups were also detected. Therefore, the structure of N-100 was suggested be a poly-isocyanate with complicated network which contained nitrogen atom as cross-linkage, iso-cyanate and alkene as end groups. The consistence of calculated values with tested values of isocyanate content, mean function degree and mean molecular weight demonstrated the cor-rect of structure characterization and the validity of network description.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第1期134-139,共6页
Chemical Journal of Chinese Universities
基金
国家"863"计划基金
关键词
N-100
NMR
HDI
水
加成反应
多异氰酸酯
N-100, Structure analysis and characterization, 1D NMR (~1H, ^(13)C), HDI, Curing agent