Effects of Thickness and Curvature on the Adhesion Properties of Cylindrical Soft Materials by a Point Contact Method

  • D. SakasegawaEmail author
  • M. Goto
  • A. Suzuki
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 136)


The effects of the sample thickness, h, and the curvature, R, on the adhesion properties between two viscoelastic materials were investigated with the use of a point contact method. Poly (sodium acrylate) (PSA) hydrogels and cross-linked polydimethylsiloxane (PDMS) were used in this study, where h and R were independently changed. The W (normal load)-dependences of the apparent contact area, S 0, and the displacement of the bulk deformation, Δh, were measured simultaneously by a point contact in a crossed-cylinder geometry. With decreasing h/R, the slope of Δh vs. W was found to decrease and to deviate largely from the prediction of the Hertz contact (= 2/3). An equation between S 0 and Δh in the range of 2 < W < 100gf was obtained, by which S 0 can be empirically estimated using the obtained Δh if h and R are given. The effects of h/R on the separation energy, E A, were discussed on the basis of the changes in the density of molecular-to-molecular contacts between polymer chains at the surface and in the degree of deformation of the bulk.


Point contact Thickness Curvature Contact area 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Graduate School of Environment and Information SciencesYokohama National University, NIPRO PATCH Co., Ltd.YokohamaJapan

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