Synergistic Effect of Sulfur and Chalcogen Atoms on the Enhanced Refractive Indices of Polyimides
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초록
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This study developed new polyimides (PIs) containing chalcogen atoms in polymer chains with an ultrahigh refractive index. A series of PIs were successfully synthesized via conventional two-step polycondensation from the diamines such as 4,4’-oxydianiline (ODA), 4,4'-thiodianiline (TDA), 4,4'-selenodianiline (SEDA), and 4,4'-tellurodianiline (TEDA) along with 4,4’-[p-thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA). The PIs exhibited good thermal stability, including a good thermal decompositon temperature (＞390 oC) and a good glass transition temperature (183-217 oC). The PIs also exhibited high refractive indices of over 1.7. In particular, the TEDA-3SDEA was 1.778, which was the highest refractive index value of a PI ever reported.