Abstract
The equilibrium volume change and the elastic modulus of poly(N-isopropylacrylamide) (PNIPA) gels containing styrene-butadiene latex were investigated. It is considered that the presence of latex particles restricts the space for polymerization and which also affects on the elastic contribution of PNIPA gels. It was found that the swelling behavior of these gels was very similar to those found in the case of dependence of cross-link density. On the other hand, tensile modulus of the gels increased drastically, although these gels seem to be swelling enough. This anomalous increment of the elasticity is assumed to depend on the way to bind two elastic components, which are the highly dense PNIPA gel phase around the latex particles and the usual PNIPA gel network. It appears that the increment of elasticity against latex concentration could be classified into two mechanisms. The first, in the low latex concentration range, the dense gel phases are dispersed apart each other, the second, in the range of high latex concentration, C≥ 12.0 wt%, the elasticity of the gel obeyed parallel model because of the formation of macro network with dense gel phases overlapped whole volume of gels.
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Ikehata, A., Takano, M. & Ushiki, H. Equilibrium Volume Change and Elastic Properties of Poly(N-isopropylacrylamide) Gels Containing Latex Particles. Polym J 33, 554–559 (2001). https://doi.org/10.1295/polymj.33.554
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DOI: https://doi.org/10.1295/polymj.33.554