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• W2075520783 startingPage "2921" @default.
• W2075520783 abstract "Organosoluble polyimide/silica hybrid materials were prepared via the sol–gel process and their pervaporation properties were studied. The organosoluble polyimide (PI) was based on 4,4′-oxydiphthlic dianhydride (ODPA) and 4,4′-diamino-3,3′-dimethyldiphenylmethane (DMMDA). The surface chemical structure of polyimide/silica films was analyzed by Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) and the results show that the completely hydrolysis of alkoxy groups of precursors and formation of the three-dimensional Si–O–Si network in the hybrid films. The morphology and the silica domain thus obtained were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The silica particle size in the hybrid is in the range of 40–100 nm for the hybrid films when the amount of silica is less than 20 wt%. The strength and the modulus of the hybrid films are improved and the mechanical properties were found to be strongly dependent on the density of the crosslink. The glass transition temperature (Tg) of the hybrid films was determined by dynamic mechanical analysis (DMA) and the value increased 15–20 °C as the silica content increased. Furthermore, the pervaporation performances of the prepared hybrid films were also investigated for the ethanol/water mixtures at different temperature." @default.
• W2075520783 created "2016-06-24" @default.
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• W2075520783 date "2006-11-01" @default.
• W2075520783 modified "2023-10-01" @default.
• W2075520783 title "Microstructure and properties of organosoluble polyimide/silica hybrid films" @default.
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• W2075520783 doi "https://doi.org/10.1016/j.eurpolymj.2006.08.004" @default.
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