College of Materials Science and Engineering, The Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University , Zhengzhou, P.R. China.
Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States.
ACS Appl Mater Interfaces. 2016 Jun 8;8(22):14150-9. doi: 10.1021/acsami.6b02888. Epub 2016 May 24.
Electrospun polyamide (PA) 66 nanofiber bundles with high conductivity, improved strength, and robust flexibility were successfully manufactured through simply adsorbing multiwall carbon nanotubes (MWNTs) on the surface of electrospun PA66 nanofibers. The highest electrical conductivity (0.2 S/cm) and tensile strength (103.3 MPa) were achieved for the bundles immersed in the suspension with 0.05 wt % MWNTs, indicating the formation of conductive network from adsorbed MWNTs on the surface of PA66 nanofibers. The decrease of porosity for the bundles immersed in the MWNT dispersion and the formation of hydrogen bond between PA66 nanofibers and MWNTs suggest a superb interfacial interaction, which is responsible for the excellent mechanical properties of the nanocomposite bundles. Furthermore, the resistance fluctuation under bending is less than 3.6%, indicating a high flexibility of the nanocomposite bundles. The resistance of the nanocomposite bundle had a better linear dependence on the temperature applied between 30 and 150 °C. More importantly, such highest working temperature of 150 °C far exceeded that of other polymer-based temperature sensors previously reported. This suggests that such prepared MWNTs-adsorbed electrospun PA66 nanofiber bundles have great potentials in high temperature detectors.
通过简单地将多壁碳纳米管（MWNTs）吸附在静电纺丝 PA66 纳米纤维的表面上，成功制造出具有高导电性、改善的强度和强韧性的静电纺丝聚酰胺（PA）66 纳米纤维束。在吸附 MWNTs 的表面形成导电网络，使在 0.05wt%MWNTs 悬浮液中浸泡的纤维束的电导率（0.2S/cm）和拉伸强度（103.3MPa）达到最高。在 MWNT 分散液中浸泡的纤维束的孔隙率降低以及 PA66 纳米纤维与 MWNTs 之间氢键的形成表明存在极好的界面相互作用，这是纳米复合材料纤维束具有优异力学性能的原因。此外，弯曲时的电阻波动小于 3.6%，表明纳米复合材料纤维束具有高柔韧性。纳米复合材料束的电阻在 30 至 150°C 之间施加的温度下具有更好的线性依赖性。更重要的是，与之前报道的其他基于聚合物的温度传感器相比，这种高达 150°C 的最高工作温度要高得多。这表明，这种制备的 MWNTs 吸附静电纺丝 PA66 纳米纤维束在高温探测器中具有巨大的潜力。
