کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187726 | 1381136 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of hydrodynamics on dynamics of phase separation in polystyrene/poly(vinyl methyl ether) blend
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of hydrodynamics on dynamics of phase separation in polystyrene/poly(vinyl methyl ether) blend Effect of hydrodynamics on dynamics of phase separation in polystyrene/poly(vinyl methyl ether) blend](/preview/png/5187726.png)
چکیده انگلیسی
Polystyrene/poly(vinyl methyl ether) (PS/PVME) phase diagram was assessed by rheological tools and by on-line microscopy observations both under quiescent and shear flow conditions. Shear flow was found to induce both mixing and demixing of the mixture depending on the amplitude of the imposed shear rate. Viscoelastic properties of PS/PVME blends were also measured under steady shear flow near the phase separation temperature. At lower shear rate, flow enhances concentration fluctuation and induces phase segregation. At high shear rate, flow suppresses fluctuations and the polymer mixture keeps its miscible state. Several rheological signatures of phase transition were found. In steady shear flow, a secondary plateau in viscosity was observed when the temperature was close to Ts whereas, at the start-up shear flow, transient shear stress showed a second overshoot after a few minutes of shearing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 21, 7 October 2005, Pages 9005-9014
Journal: Polymer - Volume 46, Issue 21, 7 October 2005, Pages 9005-9014
نویسندگان
K. El Mabrouk, M. Bousmina,