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Exploring the Potential Use of Clean Scrap PVDF as Matrix for Conductive Composites Based on Graphite, Carbon Black and Hybrids: Electromagnetic Interference Shielding Effectiveness (EMI SE)
Journal of Polymers and the Environment ( IF 4.7 ) Pub Date : 2020-05-12 , DOI: 10.1007/s10924-020-01753-4
Ariadne Leão , Tamara Indrusiak , Marysilvia F. Costa , Bluma G. Soares

Clean polyvinylidene fluoride scrap (rPVDF) from flexible oil pipelines was used as a matrix for the development of cost effective conductive composites. Carbon black (CB), expanded graphite (EG) and mixtures of both fillers were mixed with rPVDF in different compositions by melt processing. The influence of the conductive fillers on the electromagnetic interference shielding effectiveness (EMI SE) and microwave absorbing properties in the frequency range of X-band (8–12 GHz) was also investigated. Higher EMI SE was observed for the composite prepared with CB due to the higher conductivity. However, a synergistic effect was observed in both electrical conductivity and EM attenuation by reflection (reflection loss) by using hybrid materials. For composites containing 5 wt% of filler, that loaded with EG/CB (2:3 wt%) hybrid filler displayed higher attenuation of the EM (around 97%) at a frequency of 12.3 GHz. Increasing the CB in the hybrid, decrease the EM attenuation but the efficiency was observed in a broadband range, which is very important for stealth technology purpose. The influence of the fillers on the electrical, morphological and rheological properties of the composites was evaluated. Composite loaded with 7 wt% of the hybrid filler (EG/CB = 2:5 wt%) presented higher conductivity than that containing 7.5 wt% of CB but significantly lower viscosity, indicating outstanding processability. From scanning electron microscopy (SEM), it was possible to infer that the presence of CB in the hybrid promoted a better dispersion of EG, thus favoring the formation of the conducting pathway.



中文翻译:

探索将清洁废料PVDF用作基于石墨,炭黑和混合材料的导电复合材料的潜在用途:电磁干扰屏蔽效果(EMI SE)

来自柔性输油管道的干净的聚偏二氟乙烯废料(rPVDF)被用作开发经济高效的导电复合材料的基质。通过熔融加工将炭黑(CB),膨胀石墨(EG)和两种填料的混合物与rPVDF混合成不同的成分。还研究了导电填料对X波段(8–12 GHz)频率范围内的电磁干扰屏蔽效果(EMI SE)和微波吸收特性的影响。由于导电率较高,因此用CB制备的复合材料的EMI SE较高。但是,通过使用混合材料,在电导率和由反射引起的EM衰减(反射损耗)方面均观察到协同效应。对于包含5 wt%填料的复合材料,其填充有EG / CB(2:3 wt%的混合填料在12.3 GHz的频率下显示出较高的EM衰减(约97%)。增加混合中的CB,降低EM衰减,但是在宽带范围内观察到了效率,这对于隐身技术目的非常重要。评估了填料对复合材料的电学,形态和流变性能的影响。负载了7 wt%的杂化填料(EG / CB = 2:5 wt%)的复合材料比包含7.5 wt%的CB的复合材料具有更高的电导率,但粘度却大大降低,表明具有出色的可加工性。从扫描电子显微镜(SEM)可以推断,杂化物中CB的存在促进了EG更好的分散,因此有利于形成导电通路。增加混合中的CB,降低EM衰减,但是在宽带范围内观察到了效率,这对于隐身技术目的非常重要。评估了填料对复合材料的电学,形态和流变性能的影响。负载了7 wt%的杂化填料(EG / CB = 2:5 wt%)的复合材料比包含7.5 wt%的CB的复合材料具有更高的电导率,但粘度却大大降低,表明具有出色的加工性能。从扫描电子显微镜(SEM)可以推断,杂化物中CB的存在促进了EG更好的分散,因此有利于形成导电通路。增加混合中的CB,降低EM衰减,但是在宽带范围内观察到了效率,这对于隐身技术目的非常重要。评估了填料对复合材料的电学,形态和流变性能的影响。负载了7 wt%的杂化填料(EG / CB = 2:5 wt%)的复合材料比包含7.5 wt%的CB的复合材料具有更高的电导率,但粘度却大大降低,表明具有出色的可加工性。从扫描电子显微镜(SEM)可以推断,杂化物中CB的存在促进了EG更好的分散,因此有利于形成导电通路。评估了填料对复合材料的电学,形态和流变性能的影响。负载了7 wt%的杂化填料(EG / CB = 2:5 wt%)的复合材料比包含7.5 wt%的CB的复合材料具有更高的电导率,但粘度却大大降低,表明具有出色的加工性能。从扫描电子显微镜(SEM)可以推断,杂化物中CB的存在促进了EG更好的分散,因此有利于形成导电通路。评估了填料对复合材料的电学,形态和流变性能的影响。负载了7 wt%的杂化填料(EG / CB = 2:5 wt%)的复合材料比包含7.5 wt%的CB的复合材料具有更高的电导率,但粘度却大大降低,表明具有出色的加工性能。从扫描电子显微镜(SEM)可以推断,杂化物中CB的存在促进了EG更好的分散,因此有利于形成导电通路。

更新日期:2020-07-15
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