Polyimide/nano-TiO2 hybrid films having benzoxazole pendent groups: In situ sol–gel preparation and evaluation of properties |
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| Affiliation: | 1. Fraunhofer IAP, Geiselbergstr. 69, 14476 Potsdam, Germany;2. Fraunhofer ISC, Neunerplatz 2, 97082 Würzburg, Germany;3. Fraunhofer IVV, Giggenhauser Str. 35, 85354 Freising, Germany;1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, PR China;2. Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, 310032, PR China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, PR China;2. Science College of Hunan Agricultural University, Changsha, Hunan 410128, PR China;1. Luxembourg Institute of Science and Technology (LIST), Avenue des Hauts-Fourneaux 5, L4362 Esch-sur-Alzette, Luxembourg;2. UMET-ISP, UMR 8207, ENSCL, Université Lille Nord de France, BP 90108, 59652 Villeneuve d’Ascq Cedex, France;3. Université de Toulouse, UPS, INPT, LAPLACE – Laboratoire Plasma et Conversion d’Energie, 118 route de Narbonne, Toulouse Cedex 9 31062 France |
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| Abstract: | Polyimide/titania (PI/TiO2) nanocomposite films have been successfully fabricated through the in situ formation of TiO2 within a PI matrix via sol–gel method. Poly(amic acid) (PAA), which is the precursor of PI, was successfully synthesized by mixing pyromellitic dianhydride (PMDA), with equimolar amount of a diamine monomer having a pendent benzoxazole unit and two flexible ether linkages in N,N-dimethylformamide (DMF) solvent. Tetraethyl orthotitanate Ti(OEt)4] and acetylacetone were then added to the resulted PAA. After imidization at high temperature, PI/TiO2 hybrid films were formed. The structure and morphology of the hybrid nanocomposites with different titania contents (0 wt%, 5 wt%, 10 wt%, and 15 wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy. The results indicate that the TiO2 nanoparticles were homogeneously dispersed in the hybrid films. The thermogravimetric analysis of nanocomposites confirms the improvement in the thermal stability with the increase in the percentage of titania nanoparticle. Transmission electron microscopy showed that the nanoparticles with an average diameter of 25–40 nm were dispersed in the polymer matrix. |
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| Keywords: | Polyimide Sol–gel Pendent groups Nanocomposite Titania Benzoxazole |
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