Abstract
Heat transport can be dictated by the phase interface in micro- and nanostructured systems. In this research, silica aerogel (SA)/polymethyl methacrylate (PMMA) hybrid composites were prepared to investigate a link between interfacial interaction and heat transport. Using scanning electron microscopy, nitrogen adsorption-desorption tester, Fourier transform infrared spectrometer, thermogravimetric analysis, we characterized effects of phase interface on the performance of SA/PMMA hybrid composites. A time-domain thermoreflectance technique was employed for the investigation of changes of heat transport across the phase interface. The results indicated that varying interfacial interaction within SA phase and PMMA phase modulates all microstructure, mechanical properties and thermal properties. The stronger interface bond strength of covalent bonds facilitated the coupling effect for phonon transmission, which led to more efficient heat transport than non-covalent bonds. The stronger interface bond strength also improved the mechanical properties of composites. Coupling effect of Si-O bonds for phonon transmission is better than that of C-C bonds. The long molecular chain of polydivinylsiloxane (AP) improved the flexibility of SA-AP/PMMA hybrid composites.
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