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首页> 美国卫生研究院文献>Polymers >Addition of Graphite Filler to Enhance Electrical Morphological Thermal and Mechanical Properties in Poly (Ethylene Terephthalate): Experimental Characterization and Material Modeling
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Addition of Graphite Filler to Enhance Electrical Morphological Thermal and Mechanical Properties in Poly (Ethylene Terephthalate): Experimental Characterization and Material Modeling

机译：添加石墨填料以增强聚对苯二甲酸乙二酯的电形态热和机械性能：实验表征和材料建模

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Poly(ethylene terephthalate)/graphite (PET/G) micro-composites were fabricated by the melt compounding method using a minilab extruder. The carbon fillers were found to act as nucleating agents for the PET matrix and hence accelerated crystallization and increased the degree of crystallinity. TGA showed that carbon fillers improved the resistance to thermal and thermo-oxidative degradation under both air and nitrogen atmospheres. However, a poor agreement was observed at higher loadings of the filler where the composites displayed reduced reinforcement efficiency. The results demonstrate that the addition of graphite at loading >14.5 wt.% made electrically conductive composites. It was calculated that the electric conductivities of PET/graphite micro-composites were enhanced, above the percolation threshold values by two orders of magnitudes compared to the PET matrix. The minimum value of conductivity required to avoid electrostatic charge application of an insulating polymer was achieved, just above the threshold values. The addition of graphite also improved thermal stability of PET, accelerated its crystallization process and increased the degree of crystallinity. Microscopic results exhibit no indication of aggregations at 2 wt.% graphite, whereas more agglomeration and rolling up could be seen as the graphite content was increased in the PET matrix (in particular, above the percolation threshold value). Furthermore, based on the mechanical experimental characterization of the PET/graphite micro-composites, a large deformation-based mathematical model is proposed for material behavior predictions. The model fits well the experimental data and predicts other mechanical data that are not included in the parameter identification.
机译：聚对苯二甲酸乙二酯/石墨（PET / G）微复合材料是使用小型实验室挤出机通过熔融混合法制备的。发现碳填料充当PET基质的成核剂，并因此加速结晶并增加了结晶度。 TGA表明，碳填料提高了在空气和氮气气氛下对热和热氧化降解的抵抗力。然而，在填料的较高填充量下观察到差的一致性，其中复合材料显示出降低的增强效率。结果表明，以大于14.5重量％的负载量添加石墨制成导电复合材料。计算出，与PET基质相比，PET /石墨微复合材料的电导率提高了超过渗滤阈值两个数量级。达到了避免绝缘聚合物施加静电荷所需的最小导电率，刚好高于阈值。石墨的添加还改善了PET的热稳定性，加速了其结晶过程并提高了结晶度。微观结果没有显示出在2 wt。％的石墨上有聚集的迹象，但是随着PET基质中石墨含量的增加（尤其是超过渗滤阈值），可以看到更多的团聚和卷曲。此外，基于PET /石墨微复合材料的力学实验表征，提出了基于大变形的数学模型来预测材料的行为。该模型非常适合实验数据，并可以预测参数识别中未包含的其他机械数据。

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