Dielectric Properties of Layer Polymer Films
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H10.8.1
Dielectric Properties of Layer Polymer Films W. Sakai1, T. Yoshiji1, N. Tsutsumi1, and C. K. Chiang2 1 Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, JAPAN 2 Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8541, U.S.A.
ABSTRACT The dielectric and thermal properties of three-layer structured films were studied. The two outer layers were about 1 µm and the thickness of the middle layer was varied. We measured the thickness dependence of the dielectric constant of the three-layer structured films. The dielectric results were evaluated with a simple serial three-capacitance model. Local thermal property of these polymer films were also measured using a micro-tip local thermal analysis method. Local glass transition of the film was compared with the one expected from bulk data.
INTRODUCTION The dielectric and thermal properties of polymer film are important parameters in the designing of flexible electronics. It is known that bonded ultra-thin polymer films often show different electrical and thermal properties.1,2,3 On the other hand, ultra-thin polymer also may be bound between polymers for many applications. For such an ultra-thin polymer film, the interface effects between different polymers should be different from those of polymer and rigid substrate or the one between the same polymers itself. In this study, we used a simple two- or three-layered structured thin films, AB or ABA’, to investigate the interaction between high and low dielectric constant (K) polymers. The middle B layer of normal polymer served as an interface layer to control the distance. The polymer thin films were investigated by broadband dielectric measurement from 10-3 Hz to 107 Hz and micro-tip local thermal analysis. Since multi-layered polymer film is a basic structure for many device applications, this study is useful to understand not only the fundamental material science but also the application of flexible plastic electronics.
aluminum A' B A aluminum glass
Figure 1. Sample structure of three-layered polymer composite (TL series).
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EXPERIMENTAL Three-layer structured films used (TL series) are shown in Figure 1. The polymer for layer A and A’ was a cyanide resin polymer (CR-S), and B layer was polystyrene (PSt).4 These commercial polymers were used as received without further purification. The dielectric constants for CR-S and PSt were 21 and 2.5, measured at 1 kHz at 25°C, respectively.
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R = CH2CH2CN or H
1. CR-S
2. PSt
The samples of multi-layered film were made by solvent casting and spin-coating method on a deterged glass plate.4 The thickness of PS layer was changed by controlling the rotation speed, w
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