کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694060 | 1459638 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat capacity and thermodynamic functions of fullerene-containing derivatives of atactic poly(methyl methacrylate)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the present work by precision adiabatic vacuum and dynamic scanning calorimetry the heat capacity of covalent-bonded fullerenes C60 and C70 containing derivatives of atactic poly(methyl methacrylate) has been measured over the range from 6 to 350 K and from 330 to 460 K, respectively. Low-temperature heat capacity has been analyzed on the basis of Debye and Tarasov theories of the heat capacity of solids and the multifractal generalization and, as a result, some conclusions on the heterodynamics of their structures have been drawn. Temperature interval and thermodynamic characteristics of devitrification as well as their thermal stability regions have been determined. The experimental data were used to calculate standard thermodynamic functions, namely, the heat capacity Cp°(T), enthalpy H°(T) â H°(0), entropy S°(T) and Gibbs function G°(T) â H°(0), for the range from T â 0 to 430 K. The thermodynamic characteristics of fullerene-containing derivatives of atactic poly(methyl methacrylate) and a polymer-analog not including C60 and C70 have been compared.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 121-127
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 121-127
نویسندگان
N.N. Smirnova, A.V. Markin, I.E. Boronina, M.A. Lopatin,