2025-04-04 マサチューセッツ大学アマースト校
＜関連情報＞
- https://www.umass.edu/news/article/new-study-reveals-polymers-flawed-fillers-boost-heat-transfer-plastics
- https://www.science.org/doi/10.1126/sciadv.adp6516
高分子複合材料における界面熱輸送向上のための欠陥振動工学 Defects vibrations engineering for enhancing interfacial thermal transport in polymer composites
Yijie Zhou, Robert Ciarla, Artittaya Boonkird, Saqlain Raza, […] , and Yanfei Xu
Science Advances Published:22 Jan 2025
DOI:https://doi.org/10.1126/sciadv.adp6516
Abstract
To push upper boundaries of thermal conductivity in polymer composites, understanding of thermal transport mechanisms is crucial. Despite extensive simulations, systematic experimental investigation on thermal transport in polymer composites is limited. To better understand thermal transport processes, we design polymer composites with perfect fillers (graphite) and defective fillers (graphite oxide), using polyvinyl alcohol (PVA) as a matrix model. Measured thermal conductivities of ~1.38 ± 0.22 W m−1 K−1 in PVA/defective filler composites is higher than those of ~0.86 ± 0.21 W m−1 K−1 in PVA/perfect filler composites, while measured thermal conductivities in defective fillers are lower than those of perfect fillers. We identify how thermal transport occurs across heterogeneous interfaces. Thermal transport measurements, neutron scattering, quantum mechanical modeling, and molecular dynamics simulations reveal that vibrational coupling between PVA and defective fillers at PVA/filler interfaces enhances thermal conductivity, suggesting that defects in polymer composites improve thermal transport by promoting this vibrational coupling.
