کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9560335 | 1381978 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stability studies of ZSM-5/polystyrene and Y/polystyrene composites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
Zeolite (ZSM-5 or Y)/polystyrene (PS) composites were obtained by casting evaporation with different proportions (wt/wt) using ethyl acetate as the solvent. The films were characterized by XRD, SEM, water absorption, TG, DSC, and TMA (penetration mode). XRD revealed characteristic peaks of incorporated zeolites. Zeolite microdomains in the polystyrene films were detected by SEM. Water absorption was small, keeping practically constant after 4Â h of immersion. TG showed increasing thermal stability of the composites compared to that of the pure PS. DSC revealed no significant changes on glass transition temperatures (Tg). The TMA curves with a 10Â mN load showed expansion of composites up to the softening temperature (Ts) and compression of PS film. The Ts data did not show important changes, except for 20Â wt% zeolite films. TMA results with a 100Â mN load did not present any expansion, but the Ts values were much higher compared to the polystyrene film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 87, Issue 1, January 2005, Pages 153-160
Journal: Polymer Degradation and Stability - Volume 87, Issue 1, January 2005, Pages 153-160
نویسندگان
Maria J.A. Sales, SÃlvia C.L. Dias, José A. Dias, Tais de A.P.F. Pimentel,