Abstract
A series of sulfur-containing polyimides with high refractive indices have been synthesized from an aromatic sulfur-containing diamine, 4,4′-(p-phenylenedisulfanyl)dianiline (2SPDA) and various aromatic tetracarboxylic dianhydrides via a two-step polycondensation procedure. 2SPDA was synthesized by the Williamson reaction of 4-aminothiophenol with 1,4-dichlorobenzene in a yield of 75.8%. The flexible and tough polyimide films exhibited good thermal stability with the glass transition temperatures of 214.6–261.6 °C, the 5% weight loss temperatures of 509–537 °C, and residual weights of 83–91% at 550 °C in nitrogen. The films also exhibited the good transmittances of higher than 80% at 500 nm. The average refractive indices (nav) and in-plane/out-of-plane birefringence (Δn) measured at 632.8 nm are in the range of 1.7117–1.7356 and 0.0074–0.0119, respectively. The good transparency in the visible region, high nav, and low Δn of the PI films are very suitable for optical applications.
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Liu, Jg., Nakamura, Y., Shibasaki, Y. et al. Synthesis and Characterization of High Refractive Index Polyimides Derived from 4,4′-(p-Phenylenedisulfanyl)dianiline and Various Aromatic Tetracarboxylic Dianhydrides. Polym J 39, 543–550 (2007). https://doi.org/10.1295/polymj.PJ2006232
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DOI: https://doi.org/10.1295/polymj.PJ2006232
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