標題: Heat Transfer of Semicrystalline Nylon Nanofibers
作者: Chien, Hsin-Che
Peng, Wei-Tsu
Chiu, Te-Hsuan
Wu, Pei-Hsiu
Liu, Yueh-Ju
Tu, Cheng-Wei
Wang, Chien-Lung
Lu, Ming-Chang
機械工程學系
應用化學系
Department of Mechanical Engineering
Department of Applied Chemistry
關鍵字: semicrystalline polymer;nylon;nanofiber;thermal conductivity;physical aging
公開日期: 24-Mar-2020
摘要: Polymers are generally regarded as thermal insulators. The efficient heat transfer observed in the low-dimensional polymers in the literature mainly result from the larger crystallinity or improved polymer chain orientation in the low-dimensional polymers. However, the role of the amorphous domain on heat transfer in polymers remains unexplored. In this work, we report that the semicrystalline nylon polymer nanofibers can exhibit a very large thermal conductivity of 59.1 +/- 3.1 W m(-1) K-1 and the heat transfer in the semicrystalline polymer nanofibers was time-dependent. The thermal conductivity of the nanofibers could be modulated to span 3 orders of magnitude from being nearly insulated (similar to 0.27 +/- 0.02 W m(-1) K-1) to being highly thermal conductive after annealing (similar to 59.1 +/- 3.1 W m(-1) K-1). The time-dependent thermal conductivity was observed at a temperature lower than the gamma transition temperature of the polymer and was a result of the physical aging of the semicrystalline polymer. A phenomenological model was adopted to explain the time-dependent heat transfer of the semicrystalline nanofibers. The physical aging reduced the configuration disorder in the polymer and caused the heat transfer of the semicrystalline polymer to increase during the annealing process.
URI: http://dx.doi.org/10.1021/acsnano.9b07493
http://hdl.handle.net/11536/154385
ISSN: 1936-0851
DOI: 10.1021/acsnano.9b07493
期刊: ACS NANO
Volume: 14
Issue: 3
起始頁: 2939
結束頁: 2946
Appears in Collections:Articles