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Erschienen in: Polymer Bulletin 4/2012

01.03.2012 | Original Paper

Preparation and characterization of sodium alginate/poly(N-isopropylacrylamide)/clay semi-IPN magnetic hydrogels

verfasst von: Zhiqiang Li, Jianfeng Shen, Hongwei Ma, Xin Lu, Min Shi, Na Li, Mingxin Ye

Erschienen in: Polymer Bulletin | Ausgabe 4/2012

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Abstract

pH- and temperature-responsive semi-interpenetrating magnetic nanocomposite hydrogels (NC hydrogels) were prepared by using linear sodium alginate (SA), poly(N-isopropylacrylamide) (PNIPAM) and Fe3O4 nanoparticles with inorganic clay as an effective multifunctional cross-linker. The effects of cross-linker and SA contents on various physical properties were investigated. The NC hydrogels exhibited a volume phase transition temperature (VPTT) around 32 °C with no significant deviation from the conventional chemically cross-linked PNIPAM hydrogels (OR hydrogels). The swelling ratios of NC hydrogels were much larger than those of OR hydrogels. Moreover, the swelling ratios of NC hydrogels gradually decreased with increasing the contents of clay and increased with increasing the contents of SA. The pH sensitivity of NC hydrogels was evident below their VPTT. The NC hydrogels had a much better mechanical property than the OR hydrogels. The results showed that the incorporation of clay did not affect the saturation magnetization of the hydrogels.

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Metadaten
Titel
Preparation and characterization of sodium alginate/poly(N-isopropylacrylamide)/clay semi-IPN magnetic hydrogels
verfasst von
Zhiqiang Li
Jianfeng Shen
Hongwei Ma
Xin Lu
Min Shi
Na Li
Mingxin Ye
Publikationsdatum
01.03.2012
Verlag
Springer-Verlag
Erschienen in
Polymer Bulletin / Ausgabe 4/2012
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-011-0671-0

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