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Preparation and characterization of novel polyimide-silica hybrids

Title
Preparation and characterization of novel polyimide-silica hybrids
Authors
Akhter, T[Akhter, Toheed]Saeed, S[Saeed, Shaukat]Siddiqi, HM[Siddiqi, Humaira Masood]Park, OO[Park, O. Ok]
DGIST Authors
Park, OO[Park, O. Ok]
Issue Date
2013-04
Citation
Polymers for Advanced Technologies, 24(4), 407-414
Type
Article
Article Type
Article
Keywords
Atomic Force MicroscopyContact AngleEnergy Dispersive X-Ray SpectrometryField Emission MicroscopesField Emission Scanning Electron MicroscopyFilm PreparationFourier Transform Infra RedsMicrostructureNuclear Magnetic Resonance (NMR)Nuclear Magnetic Resonance SpectroscopyOligomersOrganically Modified SilicatesPolyimide-Silica HybridPolyimidesPyromellitic DianhydrideSilicaSiliconSol-Gel ProcessSurface MorphologyTetraethyl OrthosilicatesThermal StabilityThermodynamic Stability
ISSN
1042-7147
Abstract
Polyimide-silica (PI-SiO2) hybrids were prepared from a novel polyimide (PI), derived from pyromellitic dianhydride (PMDA), 1,6-bis(4-aminophenoxy)hexane (synthesized) and 4,4′-oxydianiline. SiO2 networks (5-30wt%) were generated through sol-gel process using either tetraethylorthosilicate (TEOS) or a mixture of 3-aminopropyltriethoxysilane-PMDA-based coupling oligomers (APA) and TEOS. Thin, free standing hybrid films were obtained from the respective mixtures by casting and curing processes. The hybrid films were characterized using Fourier transform infrared, 29Si nuclear magnetic resonance (NMR), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometry and atomic force microscopy (AFM) techniques. 29Si NMR results provide information about formation of organically modified silicate structures that were further substantiated by FE-SEM and AFM micrographs. Contact angle measurements and thermogravimetric thermograms reveal that the addition of APA profoundly influences surface energy, interfacial tension, thermal stability and the residual char yield of modified hybrids in comparison to those obtained by mixing only TEOS. It was found that reduced particle size, efficient dispersion and improved interphase interactions were responsible for the eventual property enhancement. © 2012 John Wiley & Sons, Ltd.
URI
http://hdl.handle.net/20.500.11750/3248
DOI
10.1002/pat.3096
Publisher
Wiley Blackwell
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringETC1. Journal Articles


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