Synthesis of high‐refractive index polyimide containing selenophene unit |
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| Authors: | Nam‐Ho You Namiko Fukuzaki Yasuo Suzuki Yasuhiro Nakamura Tomoya Higashihara Shinji Ando Mitsuru Ueda |
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| Institution: | Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2‐12‐1, H‐120, O‐okayama, Meguro‐ku, Tokyo 152‐8552, Japan |
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| Abstract: | A highly refractive and transparent aromatic polyimide (PI) containing a selenophene unit has been developed. The PI was prepared by a two‐step polycondensation procedure from 2,5‐bis(4‐aminophenylenesulfanyl)selenophene (APSP) and 4,4′‐p‐thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA), and shows high thermal stabilities, such as a relatively high‐glass transition temperature of 189 °C and 5% weight loss temperature (T5%) of 418 °C. The optical transmittance of the PI film at 450 nm is higher than 50%. The selenophene unit provides the PI with a refractive index of 1.7594, which is higher than corresponding PIs containing a thiophene or a phenyl unit because of the high polarizability per unit volume of the selenium atom. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4428–4434, 2009 |
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| Keywords: | highly refractive index optical transmittance polarizability polyimides refractive index selenophene transparency |
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