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首页> 外文期刊>Journal of Applied Polymer Science >LDPE/carbon black conductive composites: Influence of radiation crosslinking on PTC and NTC properties
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LDPE/carbon black conductive composites: Influence of radiation crosslinking on PTC and NTC properties

机译：LDPE /炭黑导电复合材料：辐射交联对PTC和NTC性能的影响

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摘要

The electrical resistivity of low-density polyethylene/carbon black composites irradiated by Co-60 gamma-rays was investigated as a function of temperature. The experimental results obtained by scanning electron microscopy, solvent extraction techniques, and pressure-specific volume-temperature analysis techniques showed that the positive temperature coefficient (PTC) and negative temperature coefficient (NTC) effects of the composites were influenced by the irradiation dose, network forming (gel), and soluble fractions (Sol). The NTC effect was effectively eliminated when the radiation dose reached 400 kGy. The results showed that the elimination of the NTC effect was related to the difference in the thermal expansion of the gel and Sol regions. The thermal expansion of the sol played an important role in both increasing the PTC intensity and decreasing the NTC intensity at 400 kGy. (C) 2002 Wiley Periodicals, Inc. [References: 25]
机译：研究了Co-60γ射线辐照的低密度聚乙烯/炭黑复合材料的电阻率随温度的变化。通过扫描电子显微镜，溶剂萃取技术和压力比体积温度分析技术获得的实验结果表明，复合材料的正温度系数（PTC）和负温度系数（NTC）效果受辐照剂量，网络的影响。形成（凝胶）和可溶性馏分（Sol）。当辐射剂量达到400 kGy时，NTC效应被有效消除。结果表明，NTC效应的消除与凝胶区和溶胶区的热膨胀差异有关。溶胶的热膨胀在增加PTC强度和降低400 kGy的NTC强度方面都起着重要作用。 （C）2002 Wiley Periodicals，Inc. [参考：25]

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