کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4995871 | 1459431 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanisms and kinetics of isothermal polymerization of N,Nâ²-bismaleimide-4,4â²-diphenylmethane with 5,5-dimethylbarbituric acid in the presence of triphenylphosphine
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mechanisms and kinetics of isothermal polymerization of N,Nâ²-bismaleimide-4,4â²-diphenylmethane (BMI) with 5,5-dimethylbarbituric acid (55BTA) in the presence of triphenylphosphine (Ph3P, as a base catalyst for aza-Michael addition reaction) were investigated. Both model-free and model-fitting methods were used to determine triplet kinetic parameters, and comparable kinetic parameters obtained. Based on the model-free method, average activation energy (Eα) and pre-exponential factor (Aα) are 33 ± 1 kJ molâ1 and 8267 ± 2 minâ1 in the α range 0.1-0.9, respectively, with g(α) = [(1 â α)â0.1 â 1]/0.1 [i.e. f(α) = (1 â α)1.1]. As to the model-free method, overall activation energy (E) and pre-exponential (A) are 32 ± 1 kJ molâ1 and 4583 ± 1 minâ1 with the g(α) = [(1 â α)â0.1 â 1]/0.1. Aza-Michael addition reaction mechanism played an important role in the polymerization of BMI/55BTA in the presence of Ph3P at low temperature. By contrast, free radical polymerization predominated in the BMI/55BTA system at higher temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 655, 10 September 2017, Pages 234-241
Journal: Thermochimica Acta - Volume 655, 10 September 2017, Pages 234-241
نویسندگان
Quoc-Thai Pham, Jung-Mu Hsu, Wan-Ju Shao, Fu-Ming Wang, Chorng-Shyan Chern,