Preparation of epoxy-based hybrid films from an aqueous TiO2 dispersion via solvent exchange and surface modification with n-octylphosphonic acid

Taichi Kaneko; Yoshitaka Kamochi; Hiroyuki Yamamoto; Kimihiro Matsukawa; Yoshiyuki Sugahara

doi:10.1080/15685543.2012.762876

Preparation of epoxy-based hybrid films from an aqueous TiO₂ dispersion via solvent exchange and surface modification with n-octylphosphonic acid

Taichi Kaneko, Yoshitaka Kamochi, Hiroyuki Yamamoto, Kimihiro Matsukawa, Yoshiyuki Sugahara

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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	https://doi.org/10.1080/15685543.2012.762876
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

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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 › peer-review

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title = "Preparation of epoxy-based hybrid films from an aqueous TiO2 dispersion via solvent exchange and surface modification with n-octylphosphonic acid",

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).",

keywords = "Epoxy resin, High refractive index, Organic-inorganic hybrids, Titania",

author = "Taichi Kaneko and Yoshitaka Kamochi and Hiroyuki Yamamoto and Kimihiro Matsukawa and Yoshiyuki Sugahara",

note = "Funding Information: This work was financially supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas {\textquoteleft}New Polymeric Materials Based on Element-Blocks (No. 2401){\textquoteright} (24102002), and the Global COE program {\textquoteleft}Center for Practical Chemical Wisdom{\textquoteright} of the Ministry of Education, Culture, Sports, Science, and Technology, Japan. The authors thank TAYCA Co., Ltd for donating the aqueous TiO2 dispersion. They also thank Daihachi Chemical Industry Co., Ltd for donating n-octylphosphonic acid and Daicel Chemical Co., Ltd for donating 3, 4-epoxy cyclohexyl-methyl-3′, 4′-epoxycyclohexy lcarboxylate.",

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N1 - Funding Information: This work was financially supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas ‘New Polymeric Materials Based on Element-Blocks (No. 2401)’ (24102002), and the Global COE program ‘Center for Practical Chemical Wisdom’ of the Ministry of Education, Culture, Sports, Science, and Technology, Japan. The authors thank TAYCA Co., Ltd for donating the aqueous TiO2 dispersion. They also thank Daihachi Chemical Industry Co., Ltd for donating n-octylphosphonic acid and Daicel Chemical Co., Ltd for donating 3, 4-epoxy cyclohexyl-methyl-3′, 4′-epoxycyclohexy lcarboxylate.

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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).

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