121st General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code POLY.P-18
Subject Fabrication of Multidirectional Stretchable Electrode System via Wrinkle Structures
Authors Joohye Won, In-Seok Park, Gilyang Kang, Changwoon Nah*
Polymer nano technology, Chonbuk National University, Korea
Abstract The flexible and stretchable displays and devices could not appear in the market without the development of flexible and stretchable electrodes. The technologies can be classified into three categories: bonding of metallic stretchable structure on rubber substrate, composites of conductive particles in rubber matrix, and coating conducting layers on rubber substrate. Recently, the authors proposed the wrinkle-based electrode system in the uniaxial mode of tensile deformation for such stretchable device applications, especially under dynamic large deformation condition. In this study, as an extension of multidirectional wrinkle-based electrode system, a series of radial extensions were employed on the wrinkle system. An acrylic rubber(AR) of crosslinked sheet was dipped into a silicone rubber (SR) solution in n-heptane for the SR molecules could be diffused in the AR network on the surfaces. After equilibrium, the swollen sample was covered onto a cylinder, then applied air pressure to make uniform expansion of the sample just like an inflated balloon. As a result of the thermal crosslinking, an IPN structure was formed between the AR and the SR chain, which is why wrinkles are produced in the sample with pre-stretching. The critical radial strain (area expansion) for initiating the wrinkles instability was found to be approximately 10% of pre-stretching. In order to apply the conductive ink, which is usually hydrophilic, the surface of sample was treated with oxygen plasma and sodium dodecyl sulfate to promote the adhesion between the sample and the metal. Conductivity measurement and fatigue test were performed on samples with conductive ink. Additionally, it was applied to both the body motion and a melody kit device for checking the stability of the electrode system.
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