کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5182158 | 1380982 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Introduction of pH-sensitive upper critical solution temperature (UCST) properties into branched polyethylenimine
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We introduced upper critical solution temperature (UCST) properties into an amine-rich polymer, branched polyethylenimine (b-PEI) by a simple sulfopropylation reaction. The phase transition behavior of the N-sulfopropylated b-PEI (PS-PEI) derivatives was influenced by the degree of sulfopropylation, concentration, molecular weight, ionic strength, and pH. In particular, the phase transition temperature of PS-PEI was strongly dependent upon pH. As the pH decreased, the protonable amine residues of PS-PEI became positively charged and interacted strongly with the negatively charged sulfonate residues, exhibiting the increase of the UCST phase transition temperature.
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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 54, Issue 20, 6 September 2013, Pages 5338–5344
Journal: Polymer - Volume 54, Issue 20, 6 September 2013, Pages 5338–5344