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Issue 48, 2015
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Poly(N-isopropylacrylamide)–clay based hydrogels controlled by the initiating conditions: evolution of structure and gel formation

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Abstract

The formation of the hydrogel poly(N-isopropylacrylamide)–clay (LAPONITE®) by redox polymerization was investigated, and the main factors governing the gel build-up were determined. The significant effect of the redox initiating system ammonium peroxodisulfate (APS) and tetramethylethylenediamine (TEMED) on gel formation and structure was established, making it possible to control the structure of the gel. Moreover, the pre-reaction stage involving the quality of the clay exfoliation in an aqueous suspension and the interaction of reaction components with the clay play a role in controlling the polymerization and gel structure. The molecular and phase structure evolution during polymerization was followed in situ by the following independent techniques: Fourier transform infrared spectroscopy (FTIR), chemorheology, small-angle X-ray scattering (SAXS) and ultraviolet-visible spectroscopy (UV/Vis). The combination of these methods enabled us to describe in detail particular progress stages during the gel formation and determine the correlation of the corresponding processes on a time and conversion scale. The mechanism of gel formation was refined based on these experimental results.

Graphical abstract: Poly(N-isopropylacrylamide)–clay based hydrogels controlled by the initiating conditions: evolution of structure and gel formation

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Publication details

The article was received on 10 Aug 2015, accepted on 15 Sep 2015 and first published on 15 Sep 2015


Article type: Paper
DOI: 10.1039/C5SM01996F
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Citation: Soft Matter, 2015,11, 9291-9306
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    Poly(N-isopropylacrylamide)–clay based hydrogels controlled by the initiating conditions: evolution of structure and gel formation

    B. Strachota, L. Matějka, A. Zhigunov, R. Konefał, J. Spěváček, J. Dybal and R. Puffr, Soft Matter, 2015, 11, 9291
    DOI: 10.1039/C5SM01996F

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