کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9559227 | 1381146 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel intramolecular blocked isocyanates as stable one-component systems for poly(urea urethane)s
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: 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](/preview/png/9559227.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 5, 14 February 2005, Pages 1459-1465
Journal: Polymer - Volume 46, Issue 5, 14 February 2005, Pages 1459-1465
نویسندگان
Luc Ubaghs, Helmut Keul, Hartwig Höcker,