کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694149 | 1459640 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Excess molar enthalpies of binary mixtures containing ethylene glycols or poly(ethylene glycols)Â +Â ethyl alcohol at 308.15Â K and atmospheric pressure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Excess molar enthalpies of binary mixtures containing ethylene glycols or poly(ethylene glycols)Â +Â ethyl alcohol at 308.15Â K and atmospheric pressure Excess molar enthalpies of binary mixtures containing ethylene glycols or poly(ethylene glycols)Â +Â ethyl alcohol at 308.15Â K and atmospheric pressure](/preview/png/9694149.png)
چکیده انگلیسی
Excess molar enthalpies, HmE, of binary mixtures containing ethylene glycols and poly(glycols) + ethyl alcohol were measured by a flow microcalorimeter at 308.15 K and at atmospheric pressure over the whole composition range. Binary mixtures contain ethyl alcohol + ethylene glycol, + di(ethylene glycol), + tri(ethylene glycol), + tetra(ethylene glycol), + poly(ethylene glycol)-200, + poly(ethylene glycol)-300, + poly(ethylene glycol)-400, + poly(ethylene glycol)-600. Effects of the molecular weight distribution (MWD), of the polymer were investigated too, by preparing three additional samples of poly(ethylene glycol) with the same number average molecular weight (Mn â 300), but different MWD. For all mixtures, results were fitted to the Redlich-Kister polynomial. HmE curves are asymmetrical, showing positive values which vary from 280 J molâ1 (diethylene glycol + ethyl alcohol) to 1034 J molâ1 (mixture containing PEGs (200 + 400) + ethyl alcohol). Effects of changes in the glycols chain length and in MWD on the molecular interactions among the mixture components are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 430, Issues 1â2, June 2005, Pages 191-195
Journal: Thermochimica Acta - Volume 430, Issues 1â2, June 2005, Pages 191-195
نویسندگان
Adriana Bigi, Fabio Comelli,