کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189201 | 1381179 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Iterative method to improve calculation of the pre-exponential factor for dynamic thermogravimetric analysis measurements
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The conventional isoconversional plot of ln(β/T2) versus 1/T usually has a large error of about â10% in calculation of the pre-exponential factor as a consequence of assuming h(x)=1. Iterative calculation using the plot of ln(β/hT2) versus 1/T is thus suggested. It is illustrated that the iterative method can greatly improve calculation for the pre-exponential factor. Success in calculation for the pre-exponential factor is accompanied by an enhanced accuracy in value of activation energy given by the iterative method in comparison with the conventional isoconversional plot of ln(β/T2) versus 1/T. One explanation is due to the compensation effect of the Arrhenius parameters. The iterative method has been applied to thermal degradation reactions of poly(methyl methacrylate) (PMMA) and polyethylene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 5, 22 February 2006, Pages 1590-1596
Journal: Polymer - Volume 47, Issue 5, 22 February 2006, Pages 1590-1596
نویسندگان
Zhiming Gao, Huixian Wang, Masahiro Nakada,