کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10377683 | 880741 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rheological behavior in water of complexes formed from poly(sodium 2-(acrylamido)-2-methylpropanesulfonate) and positively charged rodlike micelles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The viscoelastic behavior of aqueous solutions of an ionic complex formed from poly(sodium 2-(acrylamido)-2-methylpropanesulfonate) and rodlike mixed micelles of dimethyloleylamine oxide (DMOAO) and hexadecyltrimethylammonium chloride (CTAC) was investigated under oscillatory conditions. The DMOAO/CTAC mixed micelles exhibited high zero-shear viscosities (η0) depending on the mole fraction of CTAC in the mixed micelle (Y) in the range 0⩽Y⩽0.25. The addition of the polyanion had no effect on the rheological behavior of the mixed micelles when Y<0.02 at an ionic strength (μ) of 0.2. However, when Y was increased to a certain level (Yc), η0 decreased drastically; Yc depended on μ but not on the polymer concentration. These observations indicate the formation of an ionic complex between the polymer and micelle when Y⩾Yc. The reciprocal of steady-state compliance (Jeâ1) began to decrease gradually at YâYc and then leveled off at Y>0.06. The relaxation time (Ï) was found to be more strongly dependent on Y. Thus, the large decrease in η0 was attributed mainly to a decrease in Ï while the number density of junctions decreased only slightly. Therefore, it is concluded that polymer-micelle complex maintains a rodlike structure with some entanglements remaining at Y<0.12.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 286, Issue 1, 1 June 2005, Pages 142-147
Journal: Journal of Colloid and Interface Science - Volume 286, Issue 1, 1 June 2005, Pages 142-147
نویسندگان
Tatsuyoshi Kawamoto, Akihito Hashidzume, Yotaro Morishima,