کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9559752 1381246 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogenated hydroxy-functionalized polyisoprene (H-HTPI) and isocyanurate of isophorone diisocyanates (I-IPDI): reaction kinetics study using FTIR spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Hydrogenated hydroxy-functionalized polyisoprene (H-HTPI) and isocyanurate of isophorone diisocyanates (I-IPDI): reaction kinetics study using FTIR spectroscopy
چکیده انگلیسی
The reaction between a hydrogenated hydroxyl-functionalized polyisoprene (H-HTPI) and isophorone diisocyanate isocyanurate (I-IPDI) is followed by using direct FTIR spectroscopy. The reaction kinetics is studied using a simple model taking into consideration the I-IPDI structure. The rates of individual isocyanate groups are described by a second order equation. Influence of dibutyltin dilaurate (DBTL) concentration and temperature on selectivity, defined as the ratio between the rate constant of secondary isocyanate group and the rate constant of the primary isocyanate group, is investigated. It is observed that selectivity decreases when temperature or DBTL concentration increases. Eyring parameters are determined for the catalyzed [ΔH*=77/35 (kJ mol−1), ΔS*=12/−100 (J mol−1 K−1)] and uncatalyzed reactions [ΔH*=48/43 (kJ mol−1), ΔS*=−179/−167 (J mol−1 K−1)] primary and secondary isocyanate groups being differentiated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 1, 6 January 2005, Pages 15-25
نویسندگان
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