Preparation and laser sintering of a thermoplastic polyurethane carbon nanotube composite-based pressure sensor

被引:37
|
作者
Zhuang, Yu [1 ]
Guo, Yanling [1 ]
Li, Jian [1 ]
Jiang, Kaiyi [2 ]
Yu, Yueqiang [3 ]
Zhang, Hui [1 ]
Liu, Dakun [1 ]
机构
[1] Northeast Forestry Univ, Sch Mechatron Engn, Harbin 150040, Peoples R China
[2] Northeast Forestry Univ, Sch Engn & Technol, Harbin 150040, Peoples R China
[3] Northeast Petr Univ, Coll Mech Sci & Engn, Daqing 163318, Peoples R China
关键词
STRAIN; POWDER; FOAMS;
D O I
10.1039/d0ra04479b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Selective laser sintering (SLS) is a desirable method for fabricating human motion detecting sensors as it can produce a complex shape with different materials that are machinable to specific applications. The bottleneck in the SLS processing of sensors is the preparation of a material that is both flexible and conductive. In this study, carbon nanotubes (CNTs) were selected as a conductive nanofiller and dispersed into a flexible thermoplastic polyurethane (TPU) polymer matrix to prepare TPU/CNT composites for SLS processing pressure sensors. CNTs were first oxidized to prevent them from aggregating in the TPU matrix. TPU/CNT composites were preparedviasolution blending and ball milling methods, and the dispersion of the CNTs in the composites was observed by scanning electron microscopy. The thermal properties of TPU/CNT composites with different CNT content were measured, and processing parameters used in the SLS were determined based on differential scanning calorimetry measurements. SLS-processed TPU/CNT composites were prepared with different conductivity and piezoresistive properties. Percolation theory and piezoresistive performance results proved that a 0.25 wt% CNT-containing TPU/CNT composite showed the best pressure sensing ability, and it was successfully used as a sensor to detect plantar pressure distribution in a human foot.
引用
收藏
页码:23644 / 23652
页数:9
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