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Phase transition temperature controllable poly(acrylamide-co-acrylic acid) nanocomposite physical hydrogels with high strength
- 作者:Li-qin Zhang ; Li-wen Chen ; Ming Zhong ; Fu-kuan Shi…
- 刊名:Chinese Journal of Polymer Science
- 出版年:2016
- 出版时间:October 2016
- 年:2016
- 卷:34
- 期:10
- 页码:1261-1269
- 全文大小:1,025 KB
- 刊物类别:Chemistry and Materials Science
- 刊物主题:Chemistry
Condensed Matter Physics Industrial Chemistry and Chemical Engineering Polymer Sciences Characterization and Evaluation of Materials
- 出版者:Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
- ISSN:1439-6203
- 卷排序:34
文摘
Poly(acrylamide-co-acrylic acid) nanocomposite physical (P(AAm-co-AAc)NCP) hydrogels have been prepared through the in situ free radical solution polymerization based on a “single network, dual cross-linkings” strategy. The P(AAm-co-AAc) NCP hydrogels are composed of nanobrushes of P(AAm-co-AAc) chains grafted on the surface of vinylhybrid silica nanoparticles (VSNPs). In the hydrogel system, the VSNPs act as the “analogous chemical cross-linking points” once the hydrogen bonds formed between the P(AAm-co-AAc) chains of the nanobrushes, thus leading to the fabrication of high-strength P(AAm-co-AAc) NCP hydrogels. Compared with conventional thermosensitive P(AAm-co-AAc) hydrogels, the P(AAm-co-AAc) NCP hydrogels have a broader range of phase transition temperature, which can be adjusted by altering the monomer ratio, the VSNPs concentration, the addition of urea and N,N-dimethylacrylamide (DMAAm). At the same time, the mechanical properties of the P(AAm-co-AAc) NCP hydrogels have been improved significantly by the introduction of VSNPs. Furthermore, both the phase transition and the tensile strength of the P(AAm-co-AAc) NCP hydrogels are largely influenced when Fe3+ ions are introduced as the ionic crosslinkers into the hydrogel networks.KeywordsPoly(acrylamide-co-acrylic acid)Nanocomposite physical hydrogelsPhase transitionHigh strength
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