کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188784 | 1381169 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of time on the hydration and temperature-induced phase separation in aqueous polymer solutions. 1H NMR study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Dehydration during temperature-induced phase separation in D2O solutions of poly(vinyl methyl ether) (PVME), poly(N-isopropylmethacrylamide) (PIPMAm) and poly(N-isopropylacrylamide) (PIPAAm) was followed from time dependences of NMR spin-spin relaxation times T2 of HDO. Both the time characterizing the exclusion of the water from mesoglobules (manifested by the increase in T2 values) and the induction period which precedes the increase in T2 values, increased in the order PVME < PIPMAm < PIPAAm. For D2O solutions of PIPMAm/PVME (or PIPMAm/PIPAAm) mixtures a direct connection between the state of the mesoglobules (hydrated or dehydrated) formed by the component with lower LCST (PVME, PIPAAm) and the temperatures of the phase transition of the PIPMAm component was established by NMR spectroscopy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 21, 4 October 2006, Pages 7329-7334
Journal: Polymer - Volume 47, Issue 21, 4 October 2006, Pages 7329-7334
نویسندگان
Larisa Starovoytova, JiÅà SpÄváÄek,