کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189946 | 1381194 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of the cross-linking degree on the morphology of poly(NIPAAm-co-AAc) 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: Effect of the cross-linking degree on the morphology of poly(NIPAAm-co-AAc) hydrogels Effect of the cross-linking degree on the morphology of poly(NIPAAm-co-AAc) hydrogels](/preview/png/5189946.png)
چکیده انگلیسی
Hydrogels of poly(N-isopropylacrylamide) co-polymerized with acrylic acid [P(NIPAAm-co-AAc)] were synthesized with cross-linking degrees of 2-7% using (N,Nâ²-methylenebisacrylamide). SEM micrographs revealed that the morphology of dry hydrogels changes from interconnected spherical pores to channel-like pores, with the change in the cross-linking degrees from 3 to 5%. The change in morphology is associated with a significant change in the swelling ratio. It was found that the diffusion rates and permeabilities of methylene blue (MB) through the hydrogel with channel-like pores are significantly higher if the main axes of the pores are oriented parallel to the flow of MB molecules, than if it is oriented perpendicularly. These results show that different morphologies can be obtained by controlling the cross-linking degree of P(NIPAAm-co-AAc) hydrogels in a narrow range around 5% and by performing the polymerization reaction in moulds placed in horizontal and vertical positions, opening a new perspective for modulating their properties in applications as matrices for controlled release of drugs or as membranes for separation processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 14, 29 June 2007, Pages 4114-4122
Journal: Polymer - Volume 48, Issue 14, 29 June 2007, Pages 4114-4122
نویسندگان
Regiane da Silva, Marcelo Ganzarolli de Oliveira,