کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189662 | 1381189 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Compression of poly(vinyl alcohol) gels by ultracentrifugal forces
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Compression due to ultracentrifugal forces was investigated for poly(vinyl alcohol) (PVA) gels. The concentration gradient profiles for the gels were obtained by experiment and were then compared with a theoretical prediction. By the application of the centrifugal forces, the concentration gradient near the bottom increases sharply whereas the gradient inside the gel remains almost constant in the region far from the bottom. Further application of the centrifugal forces enhances the peak near the bottom. These are well explained by the theory proposed in the previous paper [Urayama et al. J Chem Phys 2005;122:024906.]. The frictional coefficient f for the PVA gels, which originates from the friction between the polymer network and solvent molecules, is estimated to be 3.5Ã1014 N s mâ4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 26, 12 December 2005, Pages 12607-12611
Journal: Polymer - Volume 46, Issue 26, 12 December 2005, Pages 12607-12611
نویسندگان
Shoji Nosaka, Shinichi Okada, Yoshiyuki Takayama, Kenji Urayama, Hiroshi Watanabe, Toshikazu Takigawa,