Novel intramolecular blocked isocyanates as stable one-component systems for poly(urea urethane)s
Novel intramolecular blocked isocyanates as stable one-component systems for poly(urea urethane)s
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DOI：
10.1016/j.polymer.2004.12.028
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发表时间：
2005-02
期刊：
影响因子：
4.6
通讯作者：
Luc Ubaghs;H. Keul;H. Höcker
中科院分区：
文献类型：
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作者：
Luc Ubaghs;H. Keul;H. Höcker
通过本体缩聚N-（羟烷基）-2-氧代-1，3-二氮杂环庚烷-1-甲酰胺11 a-e制备几种聚（脲氨基甲酸酯）低聚物14 a-e。后者的化合物是在温和的反应条件下从一种新型的活化氨基甲酸酯/分子内封闭异氰酸酯8和一系列的氨基醇的同源。研究了几种催化剂（DABCO、Sn（三酸盐）2和Bu 2 Mg）和反应温度（100-150°C）对所得聚合物的分子量和微观结构的影响。聚（脲氨基甲酸酯）是半结晶材料，其熔点显示出先前在[n]-聚酰胺、[n]-聚氨酯、聚（酯酰胺）和聚（酰胺氨基甲酸酯）中观察到的奇/偶效应。TGA分析表明，聚合物在高达约205-230°C下是稳定的，在氨基醇中具有较低数量的亚甲基的聚合物在最低温度下分解。
Several poly(urea urethane) oligomers 14a–e were prepared by polycondensation of N-(hydroxyalkyl)-2-oxo-1,3-diazepane-1-carboxamides 11a–e in bulk. The latter compounds were obtained under mild reaction conditions from a novel type of activated urethane/intramolecular blocked isocyanate 8 and a homologous series of amino alcohols. The influence of several catalysts (DABCO, Sn(octoate)2, and Bu2Mg) and reaction temperatures (100–150°C) on molecular weight and microstructure of the polymers obtained was studied. The poly(urea urethane)s are semicrystalline materials and their melting points show the odd/even effect observed earlier for [n]-polyamides, [n]-polyurethanes, poly(ester amide)s, and poly(amide urethane)s. TGA analysis showed that the polymers are stable up to approximately 205–230°C, the polymers with lower number of methylene groups in the amino alcohol decomposing at the lowest temperature.