摘要
采用高分辨核磁共振方法（１ＨＮＭＲ、１３ＣＮＭＲ）研究聚醚聚氨酯脲反应体系中聚醚多元醇（环氧乙烷／四氢呋喃共聚醚（ＰＥＴ）、聚乙二醇（ＰＥＧ））和固化剂Ｎ－１００及催化剂之间的相互作用和络合物形成．结果表明共聚醚的羟基和Ｎ－１００的异氰酸酯基团之间存在相互作用，能形成一种相对稳定的络合物．催化剂二月桂酸二丁基锡（ＤＢＴＤＬ）能与聚醚多元醇中的羟基氧络合，而使羟基质子变得十分活泼．三苯基铋（ＴＰＢ）及其乙氧基取代的衍生物与羟基质子之间存在氢键式络合作用，其作用强度随ＴＰＢ碱性增强而增强，三种乙氧基取代的ＴＰＢ中此类作用依间位＜对位＜邻位的顺序增强．
To elucidate the mechanism of the polyme rization reactions of polyether polyols with N 100,NMR spectroscopy was used to study the associations and complex formations between reactants and catalysts.Five catalysts were employed in the study:dibutyltin dilaurate(DBTDL),triphenyl bismuth(TPB) and three isomers of tris (phenyl ethoxyl) bismuth.It was found that a relatively stable complex was formed between hydroxyl and isocyanate.DBTDL was able to form a complex with hydroxyl througha bonding of tin to hydr oxyloxygen. There was hydrogen bonding type association between TPB and hydroxyl hydrogen;In the case of three isomers of tris (phenyl ethoxyl) bismuth,the association was enhanced in the sequence:meta<para <ortho isomer,in line with basicity increasing order of triphenyl bismuth.
出处
《北京理工大学学报》
EI
CAS
CSCD
1997年第4期424-430,共7页
Transactions of Beijing Institute of Technology
基金
国家"863"计划资助
关键词
聚氨酯
催化剂
相互作用
反应体系
核磁共振
association
polymer complex
NMR spectroscopy
co polyether(tetrahydrofuran ethyleneoxide)
polyurethane
dibutyltin dilaurate
triphenyl bismuth
polyethylene glycol
