کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5189653 1381189 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of physical aging on nano- and macroscopic properties of poly(methyl methacrylate) glass
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Effect of physical aging on nano- and macroscopic properties of poly(methyl methacrylate) glass
چکیده انگلیسی
Physical aging of amorphous poly(methyl methacrylate) has been studied by low frequency Raman scattering, broad-band dielectric spectroscopy, low frequency high resolution mechanical spectroscopy and differential scanning calorimetry. The material was subjected to different thermal histories by isothermal aging. A consistent relationship between the changes caused by the physical aging in nanostructure and molecular dynamics has been found. The aging makes the structure more homogeneous at a scale of few nanometers, bringing it to a structural state of lower energy. These structural changes affect mainly the α-relaxation, however, some increase in the relaxation strength as well as an increase in the activation energy of the β-relaxation is also observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 26, 12 December 2005, Pages 12523-12531
نویسندگان
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