Effects of Hygrothermal Aging and Cyclic Compressive Loading on the Mechanical and Electrical Properties of Conductive Composites.
Effects of Hygrothermal Aging and Cyclic Compressive Loading on the Mechanical and Electrical Properties of Conductive Composites.
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作者：
导电聚合物及其复合材料已广泛应用于不同的应用，包括传感应用。在此，我们构建了聚丙烯、炭黑和多壁碳纳米管（PP/CB/MWCNT）的导电复合材料，以实验研究其在潮湿热环境中的传感行为。将合成的 PP/CB/MWCNT 复合聚合物浸入 67°C 去离子水中的模拟汗液中。关于它们的电气和机械性能，通过记录质量变化、进行应变传感实验以及在浸没测试前后进行动态机械分析来研究不同的实验参数，例如循环加载和湿热老化。结果表明，填料含量提高了吸水率，但在溶液浓度较高时会降低。经过湿热老化和循环加载后，材料的敏感性下降了高达 53%。此外，循环压缩载荷下的灵敏度随着浸泡时间的增加而降低，有效的量子隧道效应和传导路径模型定性地说明了这一点。最后，湿热老化降低了复合材料的玻璃化转变温度。对于浸没在去离子水中的样品，这种降低最为显着，归因于吸湿性，降低了分子链活性。
Conductive polymers and their composites have been widely applied in different applications, including sensing applications. Herein, we constructed a conductive composite of polypropylene, carbon black, and multi-walled carbon nanotubes (PP/CB/MWCNTs) to experimentally study its sensing behaviors in a humid thermal environment. The as-synthesized PP/CB/MWCNT composite polymer was immersed in simulated sweat in deionized water at 67 °C. Regarding their electrical and mechanical properties, different experimental parameters, such as cyclic loading and hygrothermal aging, were investigated by recording the mass changes, carrying out strain sensing experiments, and performing dynamic mechanical analyses before and after the immersion test. The results reveal that the filler content improved the rate of water absorption but decreased at higher concentrations of the solution. The sensitivity of the material decreased by up to 53% after the hygrothermal ageing and cyclic loading. Moreover, the sensitivity under cyclic compression loading decreased with an increasing immersion time, qualitatively illustrated by an effective quantum tunneling effect and conducting path model. Finally, hygrothermal aging reduced the composite’s glass transition temperature. This reduction was the most significant for specimens immersed in deionized water, ascribed to the moisture absorption, reducing the molecular chain activity.
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