کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188162 | 1381147 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dielectric dispersion study of coexisting phases of aqueous polymeric solution: Poly(vinyl alcohol)Â +Â poly(vinyl pyrrolidone) two-phase systems
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The complex dielectric constant Éâ(Ï)=Éâ²âjÉâ³, electric modulus Mâ(Ï)=Mâ²+jMâ³, impedance Zâ(Ï)=Zâ²âjZâ³ and ac conductivity dispersion behaviour of 5, 10 and 15 wt% concentration aqueous solutions of poly(vinyl alcohol) (PVA) (14â000 and 77â000 g molâ1) and poly(vinyl pyrrolidone) (PVP) (24â000, 40â000 and 360â000 g molâ1) and their binary mixtures were investigated in the frequency range 20 Hz to 1 MHz at 25 °C. Analysis of dielectric constant values confirms that hydrophilic effect of PVA in aqueous solution increases the real part of dielectric constant Éâ², whereas for aqueous PVP solutions the hydrophobic effect masks the hydrophilic effect, which reduces Éâ² values below 10 kHz. Low-frequency dielectric constant of these aqueous polymeric systems is sensitive to ionic conduction and electrode polarization. The monotonous change in various electrical properties with change in volume percentage of mixture constituents indicates that individual aqueous polymer system retains their own electrical properties in the aqueous two-phase polymeric system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 9, 24 April 2007, Pages 2737-2744
Journal: Polymer - Volume 48, Issue 9, 24 April 2007, Pages 2737-2744
نویسندگان
R.J. Sengwa, Sonu Sankhla,