Lightweight and conductive carbon black/chlorinated poly(propylene carbonate) foams with a remarkable negative temperature coefficient effect of resistance for temperature sensor applications
Lightweight and conductive carbon black/chlorinated poly(propylene carbonate) foams with a remarkable negative temperature coefficient effect of resistance for temperature sensor applications
复制标题
轻质导电炭黑/氯化聚碳酸丙二酯泡沫，具有显着的负温度系数电阻效应，适用于温度传感器应用
DOI：
10.1039/c8tc02123f
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发表时间：
2018-09-21
影响因子：
6.4
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
--
作者：
Cui, Xihua;Chen, Jianwen;Jiang, Wei
在本研究中，我们通过熔融共混和后续的化学发泡工艺相结合，制备了具有良好闭孔结构的轻质可生物降解导电炭黑/氯化聚碳酸亚丙酯(CB/CPPC)泡沫塑料。结果表明，发泡处理能显著降低电渗流阈值，从2.48%(固体复合材料)降至0.138%。更有趣的是，我们注意到CB/CPPC泡沫随着温度从25°C升高到70°C呈现出几乎线性的负温度系数(NTC)效应，这归因于气体膨胀导致胞壁变薄，从而减小了相邻CB颗粒之间的距离。CB/CPPC泡沫的NTC效应比以往报道的大多数NTC复合材料的NTC效应更敏感。交联型CB/CPPC泡沫塑料具有较高的灵敏度和较好的NTC效应重现性，能够很好地检测温度变化，如演示实验所示。CB/CPPC泡沫塑料检测的温度范围从室温到70°C，这是医疗、食品和环境监测中可穿戴电子设备和多功能温度传感器的理想选择。本研究为NTC材料的大规模制备和实际应用提供了一条简便的途径。
In the current study, we fabricated lightweight and biodegradable conductive carbon black/chlorinated poly(propylene carbonate) (CB/CPPC) foams with a well-defined closed-cell structure by the combination of facile melt blending and the subsequent chemical foaming process. It was found that the foaming treatment could significantly lower the electrical percolation threshold from 2.48 vol% (solid composites) to 0.138 vol%. More interestingly, it was noted that the CB/CPPC foams exhibited a nearly-linear negative temperature coefficient (NTC) effect of resistance with increasing temperature from 25 °C to 70 °C, which was attributed to the gas expansion-induced thinning of cell walls and thereby a decreased distance between adjacent CB particles. The NTC effect of the CB/CPPC foams was more sensitive than that of most of the previously reported NTC composites. Moreover, the crosslinked CB/CPPC foams have both high sensitivity and good reproducibility of the NTC effect, which could well detect the change of temperature as shown in the demonstration experiments. The range of temperature detected by the CB/CPPC foams is from room temperature to 70 °C, which is ideal for wearable electronics and versatile temperature sensors in medical, food, and environment monitoring. The current study provides a facile route for large-scale preparation and practical application of NTC materials.