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Carbon black (CB)-filled conductive polymer composites: CB distribution and electrical properties.

机译：炭黑（CB）填充的导电聚合物复合材料：CB分布和电性能。

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摘要

Carbon black (CB) distribution and electrical properties of CB-filled conductive polymer composites were studied theoretically and experimentally in detail. Several important fundamental issues have been addressed.; The CB distribution in a neat semicrystalline polymer was elucidated using RuO4 vapor staining technique and transmission electron microscopy (TEM). It has been found that CB particles were presented between the lamellae of the semicrystalline polymer. Based on the TEM results, schematic models for the CB distribution in neat semicrystalline polymers were developed.; The CB distribution in binary immiscible polymer blends was investigated theoretically and experimentally. A thermodynamic model was derived to predict CB distribution in immiscible polymer blends. The predictions obtained by simulation agreed very well with the experimental observations. An in-complete wetting model was also developed for the case when one of the two polymer components has a very high viscosity.; The positive temperature coefficient (PTC) and negative temperature coefficient (NTC) effects of CB-filled a semicrystalline polyurethane-based shape memory polymer (SMP) composites were studied. It has been observed that apart from the CB content and the CB type, thermal aging could impose a pronounced influence on their PTC and NTC effects.; The PTC and NTC effects of CB-filled immiscible polymer blends were investigated. Some novel physical effects, such as double-PTC effect, have been observed and explained in terms of their morphological features. Schematic models were also given to predict the PTC and NTC effects of the composites with different morphologies.; The effects of mechanical strain on the electrical resistance of CB-filled neat polymers and immiscible polymer blends were elucidated. Positive strain coefficient (PSC) and negative strain coefficient (NSC) effects were observed and explained using tunneling junction and two-process models. A CB-filled neat polymer composite that is very sensitive to mechanical strain was also successfully prepared, which has potential applications in making strain sensors.
机译：从理论上和实验上详细研究了炭黑填充的导电聚合物复合材料的炭黑（CB）分布和电性能。已经解决了几个重要的基本问题。使用RuO4蒸气染色技术和透射电子显微镜（TEM）阐明了纯半结晶聚合物中的CB分布。已经发现，CB颗粒存在于半结晶聚合物的薄片之间。基于TEM结果，建立了纯净半结晶聚合物中CB分布的示意性模型。理论上和实验上研究了二元不混溶聚合物共混物中的CB分布。推导了热力学模型来预测不混溶聚合物共混物中CB的分布。通过仿真获得的预测与实验观察非常吻合。当两种聚合物组分之一具有很高的粘度时，还建立了不完全的润湿模型。研究了CB填充的半结晶聚氨酯基形状记忆聚合物（SMP）复合材料的正温度系数（PTC）和负温度系数（NTC）效应。已经观察到，除了CB含量和CB类型以外，热老化还会对其PTC和NTC效应产生显着影响。研究了CB填充的不混溶聚合物共混物的PTC和NTC效应。已经观察到了一些新颖的物理效应，例如双PTC效应，并就其形态特征进行了解释。还给出了示意图模型，以预测具有不同形态的复合材料的PTC和NTC效应。阐明了机械应变对填充CB的纯聚合物和不混溶的聚合物共混物的电阻的影响。使用隧道结和两过程模型观察并解释了正应变系数（PSC）和负应变系数（NSC）的影响。还成功制备了对机械应变非常敏感的CB填充的纯聚合物复合材料，在制造应变传感器方面具有潜在的应用。

著录项

  • 作者

    Feng, Jiyun.;

  • 作者单位

    Hong Kong University of Science and Technology (People's Republic of China).;

  • 授予单位 Hong Kong University of Science and Technology (People's Republic of China).;
  • 学科 Engineering Materials Science.; Engineering Electronics and Electrical.; Plastics Technology.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 251 p.
  • 总页数 251
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;无线电电子学、电信技术;整形外科学（修复外科学）;
  • 关键词

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