| Abstrakt: |
ABSTRACT A novel aromatic diamine monomer, 4-(3,5-dimethoxyphenyl)-2,6-bis(4-aminophenyl)pyridine (DPAP) was successfully synthesized by 4′-nitroacetophenone and 3,5-dimethoxybenzaldehyde as raw material. The structure of DPAP was confirmed by Fourier transform infrared, nuclear magnetic resonance, and mass analysis. A series of polyimides (PIs) were obtained by polycondensation with various dianhydrides via the conventional two-step method. These PIs showed good solubility in organic solvents. They also presented high thermal stability, the glass transition temperatures ( Tg) of polymers were in the range of 325-388 °C, and the temperature at 10% weight loss was in the range of 531-572 °C. Furthermore, these polymers also exhibited outstanding hydrophobicity with the contact angles in the range of 89.1°-93.5°. Moreover, the results of wide-angle X-ray diffraction (WAXD) confirmed these polymers showed amorphous structure. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45827. [ABSTRACT FROM AUTHOR] |
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