کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10609288 | 984566 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterisation of chemically crosslinked N-vinyl pyrrolidinone (NVP) based hydrogels
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synthesis and characterisation of chemically crosslinked N-vinyl pyrrolidinone (NVP) based hydrogels Synthesis and characterisation of chemically crosslinked N-vinyl pyrrolidinone (NVP) based hydrogels](/preview/png/10609288.png)
چکیده انگلیسی
Crosslinked complexes of polyvinyl pyrrolidinone-polyacrylic acid (PVP-PAA) were prepared from a mixture of NVP, AA and ethyleneglycol dimethacrylates. The FTIR spectra of PVP-PAA copolymer complexes indicates both hydrogen bonded and non-hydrogen bonded PVP. Swelling of the PVP-PAA complex in a higher pH medium is significantly different from results in low pH solutions. Above the critical pH of the copolymer the carboxylic acid group of AA ionize. Therefore there is a reduction in the intermolecular bonding and so the hydrogels tend to swell to a greater degree yielding higher 'water content' and 'water uptake' values. The rheometry results indicated that there was a significant difference in the comparative gel strength at different pHs due to the increased water uptake. It was also found that by varying the molecular weight of the crosslinking agent an increase in comparative gel strength could be achieved.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 41, Issue 6, June 2005, Pages 1272-1279
Journal: European Polymer Journal - Volume 41, Issue 6, June 2005, Pages 1272-1279
نویسندگان
Declan M. Devine, Clement L. Higginbotham,