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
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
The relation between relaxed enthalpy and volume during physical aging of amorphous polymers and selenium
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, Δh and volume contraction, Δv, were measured. From the aging records, the constant ratio Δh/Δv = 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 Δh and Δv 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
نویسندگان
, , , , , ,