کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1400298 | 984543 | 2006 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The relation between relaxed enthalpy and volume during physical aging of amorphous polymers and selenium
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
This paper reports physical aging results for PMMA, PMMA/PEO blends, PS, PC, PVC and PET (semicrystalline). Also included in this study is amorphous selenium. Temperature down-jumps from equilibrium above Tg to a temperature below Tg were carried out. Relaxed enthalpy, Îh and volume contraction, Îv, were measured. From the aging records, the constant ratio Îh/Îv = Ka was evaluated. For the polymeric samples Ka values of about 2 GPa were observed, thus similar to the inverse value of the isothermal compressibility close to Tg. Similarly for Se the Ka value obtained from Îh and Îv was in fair agreement with its isothermal compressibility.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 42, Issue 10, October 2006, Pages 2824-2837
Journal: European Polymer Journal - Volume 42, Issue 10, October 2006, Pages 2824-2837
نویسندگان
Petr Slobodian, Pavel ÅÃha, Rodney.W. Rychwalski, Igor Emri, Petr Sáha, Josef Kubát,