Longun, J.; Iroh, J.O. Fabrication of High Impact-Resistant Polyimide Nanocomposites with Outstanding Thermomechanical Properties. Polymers2023, 15, 4427.
Longun, J.; Iroh, J.O. Fabrication of High Impact-Resistant Polyimide Nanocomposites with Outstanding Thermomechanical Properties. Polymers 2023, 15, 4427.
Longun, J.; Iroh, J.O. Fabrication of High Impact-Resistant Polyimide Nanocomposites with Outstanding Thermomechanical Properties. Polymers2023, 15, 4427.
Longun, J.; Iroh, J.O. Fabrication of High Impact-Resistant Polyimide Nanocomposites with Outstanding Thermomechanical Properties. Polymers 2023, 15, 4427.
Abstract
Neat polyimide films are known to be dense and rigid. They are therefore not suitable for use in membranes, sensors and sustainable energy storage applications. In this study a novel technique has been used to simulta-neously improve the rigidity, damping ability and impact resistance of polyimide membranes. It is demonstrated that dispersion of a small amount of polyaniline copolymer-modified clay of about 0.25-0.5 wt.% into the pol-yimide matrix, resulted in enhanced storage modulus while maintaining high damping ability and glass transition temperature, Tg. Novel polyimide/substituted polyaniline-copolymer-clay nanocomposite membranes containing poly(N-ethyl-aniline-co-aniline-2-sulfonic-acid-modified-clay (SPNEAC) was successfully prepared and in-corporated into polyimide matrix to form modified clay/polyimide nanocomposites. UV-Vis analysis of the nanocomposite films show that the optical transparency of the SPNEAC-PI nanocomposite membranes de-creased with increasing SPNEAC concentration due to the high UV-Vis absorption of SPNEAC. Transmittance of about 3 % was observed in the nanocomposite membrane containing 5wt.% modified clay at 500 nm wave-length, which is significantly lower than that for the neat PI membrane of about 36 %. The dispersion of SPNEAC containing high concentration of clay (≥ 40 wt.% clay), SPNEAC2 in polyimide matrix, resulted in attainment of a higher degree of imidization than was possible for the neat organoclay/polyimide nanocomposite. This behavior is believed to be due to the synergistic interaction between PI and polyaniline copolymer modified clay. The viscoelastic property of polyimide and the nanocomposite membranes was measured by using the dynamic mechanical spectroscopy, DMS. It was shown that the glass transition temperature, Tg of the nano-composites decreased, while the damping ability and impact energy increased with increasing weight fraction of fillers.
Keywords
optical properties; degree of imidization; polyimide nanocomposite films; polyaniline copolymer/clay nanocomposites; Atomic Force Microscopy; dynamic mechanical analysis
Subject
Chemistry and Materials Science, Nanotechnology
Copyright:
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