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Home  >  Journal list  >  Polymer Journal  >  Vol.43  No.3 (2011)  >  pp.249-257

Polymer Journal
<<Previous article Vol.43  No.3 (2011)   pp.249 - 257 Next article>>

Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites

Wen-Chang Liaw1, Yu-Lin Cheng1, Yu-Sun Liao2, Chee-Shan Chen3 and Shih-Ming Lai1
1Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin, Taiwan
2Department of Materials Science and Engineering, Feng Chia University, Taichung, Taiwan
3Department of Applied Chemistry, Chaoyang University of Technology, Taichung County, Taiwan

A polyimide (PI) composite containing SiO2 and TiO2 hybridized nanoparticles was prepared by the sol-gel process. Polyamic acid (PAA) solution, the precursor of PI, was synthesized from 2,2′-bis-(3,4-dicarboxyphenyl) hexofluoropropane dianhydride and bis [4-(3-aminophenoxy) phenyl sulfone in N-methyl-2-pyrrolidone. The SiO2–TiO2 hybrid nanoparticles were prepared by the sol-gel process in a PAA solution into which tetraethoxysilane, titanium (IV) tetrabutoxide and acetylacetone were mixed for subsequent hydrolysis and condensation reactions. After spin coating of this solution onto a glass substrate, the stepwise imidization to PI and the simultaneous gelation of the SiO2–TiO2 hybrid oxides were achieved at 100–300°C. The complementing effects of reduced particle size and enhanced thermal stability of SiO2 and TiO2 on the resulting nanocomposite were observed. The former effect was contributed by TiO2 and the latter by SiO2. Uniform dispersion of 5- to 10-nm-diameter SiO2–TiO2 nanoparticles was obtained in the PI matrix. A 5-μm-thick film obtained from this procedure exhibited excellent optical transparency (91%, 500nm) at 15wt% SiO2 for a TiO2 content <5wt%.


Keyword:
calcination; morphology; polyimide; ternary hybrid nanocomposites

Received: June 01, 2010 , Revised: September 29, 2010
Accepted: October 08, 2010 , Published online: January 19, 2011
© 2011 The Society of Polymer Science, Japan

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