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Issue 51, 2014
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Layered perovskite nanosheets bearing fluoroalkoxy groups: their preparation and application in epoxy-based hybrids

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Abstract

Nanosheets bearing CF3(CF2)7C2H4O groups on their surface were prepared from a CF3(CF2)7C2H4O derivative of ion-exchangeable layered perovskite HLaNb2O7·xH2O (HLaNb) via exfoliation, and were further utilized to prepare epoxy-based hybrids. The CF3(CF2)7C2H4O derivative of HLaNb (C10F_HLaNb) was prepared by reacting the n-decoxy derivative of HLaNb with 1H,1H,2H,2H-perfluorodecanol, CF3(CF2)7C2H4OH. TEM and AFM observations revealed that the C10F_HLaNb was exfoliated into individual nanosheets bearing surfaces covered with CF3(CF2)7C2H4O groups after ultrasonication in acetonitrile. The nanosheet dispersion in acetonitrile was employed to prepare epoxy-based hybrids, and the FE-TEM image of the epoxy-based hybrid with 5 mass% of the nanosheets (C10F_HLaNb/epoxy_5) showed that the nanosheets were dispersed in the epoxy matrix. Thermogravimetry of C10F_HLaNb/epoxy_5 and neat epoxy resin indicated that the initial mass loss due to water decreased and the thermal decomposition retarded by introducing C10F_HLaNb nanosheets. Dynamic mechanical thermal analysis revealed that the glass transition temperature of C10F_HLaNb/epoxy_5 (161 °C) was higher than that of neat epoxy resin (110 °C). These results clearly exhibit that thermal properties were improved by incorporating nanosheets bearing hydrophobic CF3(CF2)7C2H4O groups in the epoxy resin most likely due to a decrease in water content. A water uptake test demonstrated that the water uptake rate of C10F_HLaNb/epoxy_5 was lower than that of the neat epoxy.

Graphical abstract: Layered perovskite nanosheets bearing fluoroalkoxy groups: their preparation and application in epoxy-based hybrids

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Publication details

The article was received on 28 Feb 2014, accepted on 30 May 2014 and first published on 04 Jun 2014


Article type: Paper
DOI: 10.1039/C4RA01777C
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Citation: RSC Adv., 2014,4, 26932-26939
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    Layered perovskite nanosheets bearing fluoroalkoxy groups: their preparation and application in epoxy-based hybrids

    Y. Asai, Y. Ariake, H. Saito, N. Idota, K. Matsukawa, T. Nishino and Y. Sugahara, RSC Adv., 2014, 4, 26932
    DOI: 10.1039/C4RA01777C

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