کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7611412 1493512 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multidetector thermal field-flow fractionation as a unique tool for the tacticity-based separation of poly(methyl methacrylate)-polystyrene block copolymer micelles
ترجمه فارسی عنوان
جداسازی جریان حرارتی مولددستر به عنوان یک ابزار منحصر به فرد برای جداسازی تاکتیکهای متیل کوپلیمر بلوک پلی (متیل متاکریلات) -پلاستریلن
کلمات کلیدی
تقسیم بندی میدان حرارتی حرارتی، انتشار حرارتی، میکل بلوک کوپلیمر، تاکتیکی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Poly(methyl methacrylate)-polystyrene (PMMA-PS) micelles with isotactic and syndiotactic coronas are prepared in acetonitrile and subjected to thermal field-flow fractionation (ThFFF) analysis at various conditions of increasing temperature gradients. It is shown for the first time that multidetector ThFFF provides comprehensive information on important micelle characteristics such as size (Dh), shape (Rg/Rh), aggregation number (Z), thermal diffusion (DT) and Soret coefficients (ST) as a function of temperature from a single injection. Moreover, it is found that micelles exhibit a unique decreasing trend in DT as a function of temperature which is independent of the tacticity of the corona and the micelle preparation method used. It is also demonstrated that ThFFF can monitor micelle to vesicle transitions as a function of temperature. In addition to ThFFF, it is found from DLS analysis that the tacticity of the corona influences the critical micelle concentration and the magnitude to which micelles expand/contract with temperature. The tacticity does not, however, influence the critical micelle temperature. Furthermore, the separation of micelles based on the tacticity of the corona highlight the unique capabilities of ThFFF.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1414, 2 October 2015, Pages 163-172
نویسندگان
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