Kim, Hyeonil Ku, Bon-Cheol Goh, Munju Ko, Heung Cho Ando, Shinji You, Nam-Ho 2024-01-19T20:34:29Z 2024-01-19T20:34:29Z 2021-09-02 2019-02-12 0024-9297 https://pubs.kist.re.kr/handle/201004/120350 To develop thermally stable optical polymers for visible and near-infrared sensor applications, a series of sulfur containing polyimides (PIs) with chalcogen atoms were successfully synthesized via conventional two-step polycondensation of 4,4'-[p-thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA) with four diamines: 4,4'-oxidianiline (ODA), 4,4'-thiodianiline (TDA), 4,4'-selenodianiline (SEDA), and 4,4'-tellurodianiline (TEDA). Because of the large atomic polarizabilities of the sulfur, selenium, and tellurium atoms, the resultant PIs exhibited significantly high refractive indices in the 1.738-1.778 range at 637 nm along with a transmittance >90% at 650-1500 nm. In addition, the PIs exhibited good thermal stability, with high thermal decomposition and glass transition temperatures (T-ds% > 390 degrees C and T-g = 183-217 degrees C, respectively). Owing to the good affinity of SEDA-3SDEA for TiO2 nanoparticles, a nanocomposite film with a 3.0 wt % loading of TiO2 nanoparticles exhibited a refractive index of 1.774 at 637 nm. English AMER CHEMICAL SOC AROMATIC IMIDE COMPOUNDS INVERSE VULCANIZATION ELEMENTAL SULFUR OPTICAL-PROPERTIES POLYMER DIFFRACTION EFFICIENCY SULFIDE RESIN Synergistic Effect of Sulfur and Chalcogen Atoms on the Enhanced Refractive Indices of Polyimides in the Visible and Near-Infrared Regions Article 10.1021/acs.macromol.8b02139 1 MACROMOLECULES, v.52, no.3, pp.827 - 834 MACROMOLECULES 52 3 827 834 scie scopus 000458937700006 2-s2.0-85061942629 Polymer Science Polymer Science Article AROMATIC IMIDE COMPOUNDS INVERSE VULCANIZATION ELEMENTAL SULFUR OPTICAL-PROPERTIES POLYMER DIFFRACTION EFFICIENCY SULFIDE RESIN Chalcogen polyimide Refractive Indices transmittance