In-Plane Birefringence of Polyimide Films Prepared on Substrates Having Thermal Expansion Anisotropy.

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  • Ando Shinji
    NTT Interdisciplinary Research Laboratories, Nippon Telegraph and Telephone Corporation, 3–9–11 Midori–cho, Musashino–shi, Tokyo 180, Japan
  • Sawada Takashi
    NTT Interdisciplinary Research Laboratories, Nippon Telegraph and Telephone Corporation, 3–9–11 Midori–cho, Musashino–shi, Tokyo 180, Japan
  • Sasaki Shigekuni
    NTT Interdisciplinary Research Laboratories, Nippon Telegraph and Telephone Corporation, 3–9–11 Midori–cho, Musashino–shi, Tokyo 180, Japan

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Polyimide films whose refractive indices in the film plane show anisotropy (in-plane birefringence, Δn) were prepared by a novel method based on the anisotropy of thermal expansion coefficients (Δα ) of single crystal substrates. Polyimide molecular chains were oriented along the crystal axis having a larger thermal expansion coefficient. The Δn of polyimide films increases as the Δα and the larger thermal expansion coefficient of the substrates increase.

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