کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5184227 1381042 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Studies of UV crosslinked poly(N-vinylpyrrolidone) hydrogels by FTIR, Raman and solid-state NMR spectroscopies
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Studies of UV crosslinked poly(N-vinylpyrrolidone) hydrogels by FTIR, Raman and solid-state NMR spectroscopies
چکیده انگلیسی

Poly(N-vinylpyrrolidone) (PVP) hydrogels have become increasingly important materials for pharmaceutical and biomedical applications. UV-light initiated oxidative crosslinking of PVP represents a novel method for producing PVP based hydrogel materials. However, the mechanism of the gelation by this approach is poorly understood. In this study, the reaction mechanism for the crosslinking process is investigated by FTIR, Raman, and solid-state CP/MAS NMR techniques. Both FTIR and Raman spectra indicate that in the process of free radical oxidative crosslinking, the pyrrolidone ring is partially transformed into a succinimide ring. Solid-state NMR data have confirmed this change, and provided evidence that stable intermediates of 4-hydroperoxy-pyrrolidone (PVP-OOH) and its accompanied 4-hydroxy-pyrrolidone (PVP-OH) are formed. The pyrrolidone hydroperoxide intermediate can account for the efficient crosslinking, producing a sufficient level of macroradicals to form stable hydrogels.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 51, Issue 14, 24 June 2010, Pages 3054-3063
نویسندگان
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