Optical anisotropy of uniaxially drawn and silver-dispersed polyimide films

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  • Takashi Sawada
    NTT Science and Core Technology Laboratory Group, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan
  • Shinji Ando
    NTT Science and Core Technology Laboratory Group, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan
  • Shigekuni Sasaki
    NTT Science and Core Technology Laboratory Group, 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-8585, Japan

抄録

<jats:p>Distinct anisotropy in optical transmittance in the visible and near-infrared region for uniaxially drawn and silver-dispersed polyimide films was observed. The films were prepared in a one-step operation that involves thermal curing and simultaneous uniaxial drawing of poly(amic acid) (PAA) films, which were made by dissolving silver nitrate in the PAA solution at a 1:4 mol ratio. The polyimide molecular chains with a rod-like structure were oriented along the drawing direction during curing, and this orientation accompanied the generation of silver nanoparticles with elongated shapes. An anisotropy in the optical transmittance of 5:1 was obtained for a 22-μm-thick film at 850 nm with transmittance of 68% perpendicular to the drawing direction. The optical and mechanical properties of this film were retained after annealing at 300 °C for 1 h.</jats:p>

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