Abstract
Transparent TiO2/epoxy hybrid films with high refractive indices have been prepared from a 9-mass% aqueous TiO2 (rutile form) dispersion by a combination of dispersion medium exchange and surface modification with n-octylphosphonic acid (OPA). The dispersion medium was exchanged from H2O to N-methylformamide (NMF) by distilling off H2O after the addition of NMF. The TiO2 surface was then modified with OPA by heating at 80°C for 24 h. IR and NMR spectra of the OPA-modified TiO2 nanoparticles (NPs) revealed that the OPA moiety was grafted onto the surface of the TiO2 NPs through Ti-O-P bonds. The resulting OPA-modified TiO2 NPs were employed to prepare epoxy-based hybrid films possessing excellent transparency. The transmittance in the entire visible range (400-800 nm) of the hybrid film containing 66.3 mass% TiO2 was above 94%. This hybrid film also exhibited the highest refractive index (n = 1.74), which represented a remarkable increase from that of the pure epoxy resin film (n = 1.51).
Original language | English |
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Pages (from-to) | 593-601 |
Number of pages | 9 |
Journal | Composite Interfaces |
Volume | 19 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2012 |
Keywords
- Epoxy resin
- High refractive index
- Organic-inorganic hybrids
- Titania
ASJC Scopus subject areas
- Ceramics and Composites
- Physics and Astronomy(all)
- Surfaces, Coatings and Films