讨论了不同交联体系对正温度系数效应(PTC)材料性能的影响,重点分析了对电阻率、PTC强度和负温度系数效应(NTC)的调控作用。研究表明,适当的交联处理可以优化复合材料的微观结构,构建稳定的导电网络,从而提升PTC性能并显著减弱或消除NTC效应。在单一交联体系中,辐照交联通过形成三维交联网络有效抑制高温下导电填料的迁移,增强了材料的热机械稳定性;化学交联则通过基体改性和基体-填料桥连,进一步改善了导电填料的分散性及相容性。双重交联体系结合了辐照和化学交联的优势,展现出更大的潜力,不仅在提升PTC强度方面效果显著,还能有效改善材料的稳定性。
This paper discussed the specific impact of different crosslinking systems on the performance of positive temperature coefficient (PTC) materials,with a focus on their regulatory effects on resistivity,PTC intensity,and negative temperature coefficient (NTC).The study showed that appropriate crosslinking treatment could optimize the microstructure of composite materials,construct a stable conductive network,thereby enhancing PTC performance and significantly reducing or eliminating the NTC effect.In a single crosslinking system,radiation crosslinking effectively suppressed the migration of conductive fillers at high temperatures by forming a three-dimensional crosslinked network,enhancing the thermo-mechanical stability of the material.Chemical crosslinking further improved the dispersibility and compatibility of conductive fillers through matrix modification and matrix-filler bridging.The dual crosslinking system combined the advantages of radiation and chemical crosslinking and exhibited greater potential,which not only significantly enhanced PTC intensity but also effectively improved the stability of materials.
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基金资助
吉林省科技发展计划项目(20210203126SF、20220203087SF和20230508042RC)
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