Thermal conductivity of porous silica films using modified polydimethylsiloxane and polyethyleneglycol as templates by sol-gel process

摘要

This paper reports the heat-resistant property of porous silica films synthesized using the sol-gel method. In the sol-gel system, a mixture solvent was adopted and side-chain polyether modified polydimethylsiloxane and polyethyleneglycol were introduced as the template and viscosity adjusting agent, respectively. Differential thermal analysis/thermogravimetric analysis, Fourier transform infrared spectroscopy, field emitted scanning electron microscope, and high-resolution transmission electron microscopy were employed to characterize the samples. Thermal conductivity measured by the 3ω method as functions of porosity, thickness, and annealing temperature was discussed in detail.