کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7790943 | 1500645 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of polyelectrolyte complexes with diethylaminoethyl dextran: Charge ratio and molar mass effect
ترجمه فارسی عنوان
تشکیل پلی اتیلن الکترولیت با دیتیلامینی اتیل دکستران: نسبت شارژ و اثر توده مولی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
The formation of polyelectrolyte complexes (PECs) between carboxymethyl pullulan and DEAE Dextran, was investigated, in dilute solution, with emphasis on the effect of charge density (molar ratio or pH) and molar masses. Electrophoretic mobility measurements have evidenced that insoluble PECs (neutral electrophoretic mobility) occurs for charge ratio between 0.6 (excess of polycation) and 1 (stoichiometry usual value) according to the pH. This atypical result is explained by the inaccessibility of some permanent cationic charge when screened by pH dependant cationic ones (due to the Hoffman alkylation). Isothermal titration calorimetry (ITC) indicates an endothermic formation of PEC with a binding constant around 105Â LÂ molâ1. Finally asymmetrical flow field flow fractionation coupled on line with static multi angle light scattering (AF4/MALS) evidences soluble PECs with very large average molar masses and size around 100Â nm, in agreement with scrambled eggs multi-association between various polyelectrolyte chains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 113, 26 November 2014, Pages 217-224
Journal: Carbohydrate Polymers - Volume 113, 26 November 2014, Pages 217-224
نویسندگان
Didier Le Cerf, Anne Sophie Pepin, Pape Momar Niang, Mariana Cristea, Carole Karakasyan-Dia, Luc Picton,