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 |
|---|---|
| Pages (from-to) | 593-601 |
| Number of pages | 9 |
| Journal | Composite Interfaces |
| Volume | 19 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2012 |
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Keywords
- Epoxy resin
- High refractive index
- Organic-inorganic hybrids
- Titania
ASJC Scopus subject areas
- Ceramics and Composites
- Surfaces, Coatings and Films
- Physics and Astronomy(all)
Cite this
Preparation of epoxy-based hybrid films from an aqueous TiO2 dispersion via solvent exchange and surface modification with n-octylphosphonic acid. / Kaneko, Taichi; Kamochi, Yoshitaka; Yamamoto, Hiroyuki; Matsukawa, Kimihiro; Sugahara, Yoshiyuki.
In: Composite Interfaces, Vol. 19, No. 9, 2012, p. 593-601.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Preparation of epoxy-based hybrid films from an aqueous TiO2 dispersion via solvent exchange and surface modification with n-octylphosphonic acid
AU - Kaneko, Taichi
AU - Kamochi, Yoshitaka
AU - Yamamoto, Hiroyuki
AU - Matsukawa, Kimihiro
AU - Sugahara, Yoshiyuki
PY - 2012
Y1 - 2012
N2 - 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).
AB - 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).
KW - Epoxy resin
KW - High refractive index
KW - Organic-inorganic hybrids
KW - Titania
UR - http://www.scopus.com/inward/record.url?scp=84875149505&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84875149505&partnerID=8YFLogxK
U2 - 10.1080/15685543.2012.762876
DO - 10.1080/15685543.2012.762876
M3 - Article
VL - 19
SP - 593
EP - 601
JO - Composite Interfaces
JF - Composite Interfaces
SN - 0927-6440
IS - 9
ER -