Elastic Modulus and Thermal Conductivity of Thiolene/TiO2 Nanocomposites

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Eugen SchechtelGeorge Fytas

Abstract

Metal oxide based polymer nanocomposites find diverse applications as functional materials, and in particular thiol-ene/TiO2 nanocomposites are promising candidates for dental restorative materials. The important mechanical and thermal properties of the nanocomposites, however, are still not well understood. In this study, the elastic modulus and thermal conductivity of thiol-ene/TiO2 nanocomposite thin films with varying weight fractions of TiO2 nanoparticles are investigated by using Brillouin light scattering spectroscopy and 3ω measurements, respectively. As the TiO2 weight fraction increases from 0 to 90%, the effective elastic longitudinal modulus of the films increases from 6.2 to 37.5 GPa, and the effective thermal conductivity from 0.04 to 0.76 W/m K. The former increase could be attributed to the covalent cross-linking of the nanocomposite constituents. The latter one could be ascribed to the addition of high thermal conductivity TiO2 nanoparticles and the formation of possible conductive channels at high TiO2 weight fractions. The linear dependence of the thermal conductivity on the sound velocity, reported for amorphous polymers, is not observed in the present nanocomposite system.

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Citations

Mar 25, 2018·Advanced Materials·Xiangfan XuBaowen Li
Sep 6, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Eugen SchechtelWolfgang Tremel
Jul 30, 2019·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Meguya RyuJunko Morikawa

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Methods Mentioned

BETA
light
light scattering
scanning electron microscopy
X-ray
light spectroscopy

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