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• W2032906887 abstract "Two kinds of novel aromatic, unsymmetrical diamines with ether–ketone group, 3-amino-4′-(4-amino-2-trifluoromethylphenoxy)-benzophenone and 3-amino-4′-(4-aminophenoxy)-benzophenone, was successfully synthesized by two different synthetical routes and polymerized with various aromatic tetracarboxylic acid dianhydrides, including 4,4′-oxydiphthalic anhydride, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride, and 2,2′-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride, via a conventional two-step thermal or chemical imidization method to produce a series of fluorinated polyimides. The polyimides were characterized with solubility tests, viscosity measurements, mechanical properties tests, IR-FT, and thermogravimetric analysis. The polyimides had inherent viscosities of 0.54–0.77 dL/g and were easily dissolved in both polar, aprotic solvents and common, low-boiling-point solvents. The resulting strong and flexible polyimide films exhibited excellent thermal stability, with decomposition temperatures (at 10% weight loss) above 573 °C and glass-transition temperatures in the range of 222–251 °C. Moreover, the polymer films showed outstanding mechanical properties, with tensile strengths of 86.5–121.6 MPa, elongations at break of 9–16%, and initial moduli of 1.26–1.97 GPa. These outstanding combined features ensure that the polymers are desirable candidate materials for advanced applications." @default.
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• W2032906887 date "2010-09-01" @default.
• W2032906887 modified "2023-10-08" @default.
• W2032906887 title "Characterizations and thermal stability of soluble polyimide derived from novel unsymmetrical diamine monomers" @default.
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• W2032906887 doi "https://doi.org/10.1016/j.polymdegradstab.2010.04.003" @default.
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