| 异佛尔酮二异氰酸酯与聚乙二醇的反应动力学研究 |
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| 引用本文： | 谭惠民,谭头文,张喜田.异佛尔酮二异氰酸酯与聚乙二醇的反应动力学研究[J].北京理工大学学报,1992(Z1). |
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| 作者姓名： | 谭惠民 谭头文 张喜田 |
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| 作者单位： | 北京理工大学化工与材料学院
(谭惠民，谭头文)，中国科学院长春应化所(张喜田) |
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| 摘 要： | 采用~(13)C-NMR及二正丁胺滴定法研究了端羟基聚乙二醇(PEG)与异佛尔酮二异氰酸酯(IPDI)之间反应的动力学特征,发现在三苯基铋(TPB)的催化下,对NCO]是零级反应,即反应与IPDI分子上两个-NCO基团的活性无关,当以二月桂酸二丁基锡(DBTDL)为催化剂时,对NCO]为二级反应,而且与异佛尔酮脂环的碳原子相连的-NCO表现较强的反应能力.采用DBTDL与TPB混合催化时,反应表现为二者的加和作用,混合催化剂的应用有利于前期反应的加速和后期反应的完善,提出了不同反应条件下的反应机理。
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| 关 键 词： | 端羟基聚乙二醇 异佛尔酮二异氰酸酯 三苯基铋 核磁共振 反应动力学 |
The Reaction Kinetics Between Isophorone Diisocyanate and Polyethylene Glycol |
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| Tan Huimin Tan Touwen.The Reaction Kinetics Between Isophorone Diisocyanate and Polyethylene Glycol[J].Journal of Beijing Institute of Technology(Natural Science Edition),1992(Z1). |
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| Authors: | Tan Huimin Tan Touwen |
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| Abstract: | Reaction characteristics between hydroxy terminated polyethylene glycol (PEG) and isophorone di-isocyanate (EPDI) was observed with 13C-NMR accompanied by di-n-butylamine titration method. Zero-order reaction appeared when triphenyl bismuth (TPB) used as catalyst and reaction activities of-NCO groups were regardless to their position. Meanwhile a second-order reaction appeared when the reaction was catalyzed with dibutyltin dilaurate (DBTDL). The activities of -NCO groups in the later situation were apparently associated with their position. Combined application of TPB and DBTDL showed an additive results.suitable port-life and better network distribution hence will be benefited. Reaction mechanisms were schematically proposed. |
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| Keywords: | hydroxy terminated polyethylene glycol isophorone diisocyanate triphenyl bismuth reaction kinetics |
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