Abstract
Aromatic thiophene-containing diamines, 2,5-bis(4-aminophenylsulfanyl)thiophene (APST) and 2,5-bis{2′-[5′-(4′′-aminophenyl)sulfanyl]thienyl}thiophene (APSTT), were synthesized and polymerized with a sulfur-containing dianhydride, 4,4′-[p-thiobis(phenylenesulfanyl)]diphthalic anhydride (3SDEA) and 4,4′-oxydiphthalic anhydride (ODPA), respectively, to afford four poly(amic acid)s (PAAs) with inherent viscosities of 0.41 to 1.68 dL/g. Flexible and tough polyimide (PI) films obtained from the PAA precursors showed good thermal, mechanical, and optical properties. The glass-transition temperatures (Tg) of the PIs were in the range of 157−220 °C, determined by differential scanning calorimetry (DSC), and 160−216 °C by dynamic mechanical analysis (DMA), depending on the dianhydride used. The 10% weight loss temperatures were in the range of 354−456 °C, showing relatively high thermally resistant characteristics of the PI films. The PI films also showed good optical transparency above 500 nm, which agreed well wi...
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