9 March 2014 Frictional properties of gel engineering materials with laser surface texturing
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Several synthesis methods have been devised to improve the mechanical strength of gels extraordinarily after 2001. It was a trigger to use gels as a new industrial materials, since gels had been considered difficult for industrial materials because of their weakness. In a recent study, we had designed transparency shape memory gels for the first time. Shape memory gels are one of the gels with characteristic networks, and have a shape memory function by copolymerizing an acrylic monomer with a hydrophobic long alkyl side group. It is well known that the mechanical properties such as Young’s modulus and friction coefficient of shape memory gels depend on temperature. In this study, we tried to change the frictional properties of shape memory gels by laser surface texturing. Two types of processed surface were prepared. The hexagonal close packed pattern and the square close packed pattern of dimples were formed on the surface of gel sheets with CO2 laser. The intensity of laser was optimized to avoid cutting gels. The friction coefficients of unprocessed gels and two types of processed gels were measured by ball-on-disk method. Measurement partner material was sodalime glass ball. The measurement results of processed gels showed clear differences from unprocessed gels. The friction coefficients of processed gels were larger than unprocessed gels. However, these results specifically showed the velocity dependence. It indicates that surface texturing enable to control the friction coefficient of polymer gels by surface pattern and velocity.
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Naoya Yamada, Naoya Yamada, Jin Gong, Jin Gong, M. Hasnat Kabir, M. Hasnat Kabir, Masato Makino, Masato Makino, Keisuke Maekawa, Keisuke Maekawa, Masato Wada, Masato Wada, Hidemitsu Furukawa, Hidemitsu Furukawa, "Frictional properties of gel engineering materials with laser surface texturing", Proc. SPIE 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014, 90580C (9 March 2014); doi: 10.1117/12.2046261; https://doi.org/10.1117/12.2046261

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