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Issue 15, 2012
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Mechanical properties of temperature sensitive microgel/polyacrylamide composite hydrogels—from soft to hard fillers

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Abstract

In this study we investigated the mechanical properties of composite hydrogels based on a polyacrylamide (PAAm) matrix with embedded temperature sensitive poly(N-isopropylacrylamide) (PNiPAM) microgels. We analysed the mechanical properties of the composite material with tensile tests, shear and cavitation rheology. The results of the different experiments displayed an enhancement of mechanical stability with increasing concentration of incorporated microgels. The improved stability is related to an increase of physical cross-linking points due to the incorporation of the microgels. The incorporation of temperature responsive microgel particles introduces temperature sensitive mechanical behaviour of the composite hydrogels. The collapse of the microgels inside the polyacrylamide matrix leads to a change of the volume of the filler particles as well as to a change from a soft filler to a hard filler. The influence of the hard particles on the mechanical stability of the matrix is much stronger which leads to materials with enhanced mechanical properties at high temperatures.

Graphical abstract: Mechanical properties of temperature sensitive microgel/polyacrylamide composite hydrogels—from soft to hard fillers

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Publication details

The article was received on 30 Sep 2011, accepted on 14 Feb 2012 and first published on 07 Mar 2012


Article type: Paper
DOI: 10.1039/C2SM06868K
Citation: Soft Matter, 2012,8, 4254-4263
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    Mechanical properties of temperature sensitive microgel/polyacrylamide composite hydrogels—from soft to hard fillers

    J. Meid, F. Dierkes, J. Cui, R. Messing, A. J. Crosby, A. Schmidt and W. Richtering, Soft Matter, 2012, 8, 4254
    DOI: 10.1039/C2SM06868K

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