Issue 45, 2016

Stretchable, adhesive and ultra-conformable elastomer thin films

Abstract

Thermoplastic elastomers are attractive materials because of the drastic changes in their physical properties above and below the glass transition temperature (Tg). In this paper, we report that free-standing polystyrene (PS, Tg: 100 °C) and polystyrene–polybutadiene–polystyrene triblock copolymer (SBS, Tg: −70 °C) thin films with a thickness of hundreds of nanometers were prepared by a gravure coating method. Among the mechanical properties of these thin films determined by bulge testing and tensile testing, the SBS thin films exhibited a much lower elastic modulus (ca. 0.045 GPa, 212 nm thickness) in comparison with the PS thin films (ca. 1.19 GPa, 217 nm thickness). The lower elastic modulus and lower thickness of the SBS thin films resulted in higher conformability and thus higher strength of adhesion to an uneven surface such as an artificial skin model with roughness (Ra = 10.6 μm), even though they both have similar surface energies. By analyzing the mechanical properties of the SBS thin films, the elastic modulus and thickness of the thin films were strongly correlated with their conformability to a rough surface, which thus led to a high adhesive strength. Therefore, the SBS thin films will be useful as coating layers for a variety of materials.

Graphical abstract: Stretchable, adhesive and ultra-conformable elastomer thin films

Supplementary files

Article information

Article type
Paper
Submitted
31 May 2016
Accepted
08 Oct 2016
First published
11 Oct 2016
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2016,12, 9202-9209

Author version available

Stretchable, adhesive and ultra-conformable elastomer thin films

N. Sato, A. Murata, T. Fujie and S. Takeoka, Soft Matter, 2016, 12, 9202 DOI: 10.1039/C6SM01242F

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