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Preparation and characterization of polyimide/titania nanohybrid films
Author(s) -
Rafiee Zahra,
Mallakpour Shadpour,
Khalili Sedigheh
Publication year - 2014
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22802
Subject(s) - materials science , nanocomposite , polyimide , alkoxide , acetylacetone , thermal decomposition , fourier transform infrared spectroscopy , chemical engineering , polymer chemistry , composite material , organic chemistry , chemistry , layer (electronics) , engineering , catalysis
Thermally stable polyimide/titania (PI/TiO 2 ) hybrid nanocomposite films have been successfully synthesized through the in situ formation of TiO 2 within a PI matrix via sol‐gel process. Poly(amic acid) (PAA) solution is prepared from 3,5‐diamino benzoyl amino phenyl‐14H‐dibenzo[a,j]xanthene and 4,4′‐(hexaflouroisopropylidene)diphthalic anhydride in N ‐methyl‐2‐pyrrolidinone solvent. The different amounts of tetraethyl orthotitanate and actylacetone are incorporated into PAA matrix, and then thermally imidized to form PI/TiO 2 . The chelating agent, acetylacetone, was applied to reduce the gelation rate of titanium alkoxide. Thermal decomposition temperatures of nanocomposites with a 10% weight loss were in excess of 500°C, and char yields higher than 63% at 800°C in nitrogen. The chemical and morphological structures of the hybrid nanocomposites were characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, and transmission electron microscopy. The results show that the TiO 2 particles are well dispersed in the PI matrix with particle size between 10 and 30 nm in diameter. POLYM. COMPOS., 35:1486–1493, 2014. © 2013 Society of Plastics Engineers