کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1400280 984543 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Miscibility and phase separation in SAN/PMMA blends investigated by positron lifetime measurements
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Miscibility and phase separation in SAN/PMMA blends investigated by positron lifetime measurements
چکیده انگلیسی

Miscibility and phase separation in SAN/PMMA blends have been investigated using DSC, IR spectroscopy and positron lifetime spectroscopy (PLS). Single broad glass transition observed throughout the blend compositions, may be due to overlap of two glass transitions. IR measurements clearly indicate the absence of strong interactions. This supports miscibility is due to intramolecular repulsive forces in the SAN component. On the other hand, free volume data show negative deviation from linear additivity indicating the blends are miscible. The interchain interaction parameter β exhibits a complex behavior and the extent of miscibility is not revealed. Following Wolf’s treatment, we have evaluated the geometry factor γ and hydrodynamic interaction parameter α and found α is a suitable parameter in predicting the miscibility window. The cloud points in SAN/PMMA blends increase with decreasing PMMA content. The change in free volume size correlates well with the observed change in cloud point.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 42, Issue 10, October 2006, Pages 2655–2666
نویسندگان
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