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- Title
Dimensional crossover of heat conduction in amorphous polyimide nanofibers.
- Authors
Dong, Lan; Xi, Qing; Chen, Dongsheng; Guo, Jie; Nakayama, Tsuneyoshi; Li, Yunyun; Liang, Ziqi; Zhou, Jun; Xu, Xiangfan; Li, Baowen
- Abstract
The mechanism of thermal conductivity in amorphous polymers, especially polymer fibers, is unclear in comparison with that in inorganic materials. Here, we report the observation of a crossover of heat conduction behavior from three dimensions to quasi-one dimension in polyimide nanofibers at a given temperature. A theoretical model based on the random walk theory has been proposed to quantitatively describe the interplay between the inter-chain hopping and the intra-chain hopping in nanofibers. This model explains well the diameter dependence of thermal conductivity and also speculates on the upper limit of thermal conductivity of amorphous polymers in the quasi-1D limit.
- Subjects
NANOFIBERS; HEAT conduction; AMORPHOUS substances
- Publication
National Science Review, 2018, Vol 5, Issue 4, p500
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwy004