کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
639630 1456194 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Physical aging of thin glassy polymer films: Free volume interpretation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Physical aging of thin glassy polymer films: Free volume interpretation
چکیده انگلیسی

Previous studies have documented the dramatic effects of film thickness, at least compared to the bulk state, and the more modest effects of aging temperature and polymer structure on physical aging of thin glassy polymer films. In this paper, these results are interpreted in terms of the free volume calculated from the refractive index, determined by ellipsometry, using the Lorentz–Lorenz equation. The relative progress of aging towards the final equilibrium state was determined using this approach. The free volume data were fitted to the Struik model for the self-retarding volume contraction on aging to obtain the thickness and temperature dependent parameters. The gas permeability versus aging time is related to the free volume computed from the refractive index. The effect of prior history on the aging of thin glassy polymer films was briefly explored.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 277, Issues 1–2, 1 June 2006, Pages 219–229
نویسندگان
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