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To push upper boundaries of effective thermal conductivity in polymercomposites, a fundamental understanding of thermal transport mechanisms iscrucial. Although there is intensive simulation research, systematicexperimental investigation on thermal transport in polymer composites islimited. To better understand thermal transport processes, we design polymercomposites with perfect fillers (graphite) and defective fillers (graphiteoxide); we choose polar polyvinyl alcohol (PVA) as a matrix model; and weidentify how thermal transport occurs across heterogeneous interfaces. Measuredthermal conductivities of in PVA/defective filler composites is higher thanthose of PVA/perfect filler composites, while measured thermal conductivitiesin defective fillers are lower than those of perfect fillers. An effectivequantum mechanical model is developed, showing that the vibrational state ofthe defective level plays a critical role in enhancing the thermal conductivitywith increased defect concentration. Our experimental and model results havesuggested that defects in polymer composites may enhance thermal transport inpolymer composites by promoting vibrational resonant couplings.

Defects Vibrations Engineering for Enhancing Interfacial Thermal Transport