کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5188395 1381154 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of particle-solvent interactions in pH-responsive cross-linked microgel systems
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Analysis of particle-solvent interactions in pH-responsive cross-linked microgel systems
چکیده انگلیسی

Viscometry, static light scattering and turbidimetry studies were performed to investigate the interaction between pH-responsive microgels consisting of methacrylic acid (MAA) and ethyl acrylate (EA) copolymers cross-linked with di-allyl phthalate (DAP) and the solvent environment. The characteristics of microgel particles and their corresponding interaction potential were manipulated by varying the following: (a) degree of neutralization of MAA groups; α (b) salt concentrations and (c) microgel cross-linked density. Three independent interaction parameters, i.e. Huggins constant, Kh, second virial coefficient, A2 and apparent second virial coefficient, Bapp, which describe the degree of particle-solvent interactions, were obtained from these techniques. A scaling relationship between the three parameters given as: Bapp/Kh∝αM¯wA2 (where M¯w represents the weight-average molecular weight), was proposed. Good agreement was observed, where all the data for the three different salt concentrations of each microgel with different cross-linked densities collapsed onto a single master curve. This suggested that all three techniques can accurately predict the degree of interaction between microgel particle and solvent environment. Turbidimetry, being the simplest among the three techniques is the most convenient method.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 22, 19 October 2007, Pages 6589-6597
نویسندگان
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