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作 者:蔡洁 王亮[1] 傅宏俊[1] 钟智丽[1] CAI Jie;WANG Liang;FU Hongjun;ZHONG Zhili(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China)
机构地区:[1]天津工业大学纺织科学与工程学院,天津300387
出 处:《纺织学报》2023年第2期111-117,共7页Journal of Textile Research
摘 要:为增强碳纤维织物复合材料对电磁波的阻抗匹配性,减少二次反射,采用玻璃纤维调控碳纤维织物组织结构,并将其与水性聚氨酯复合,设计并制备了5种玻璃纤维/碳纤维(G/C)织物复合材料。借助超景深显微镜、矢量网络分析仪、模拟日光氙灯光源系统、红外热成像仪对G/C织物复合材料的形貌结构、电磁屏蔽性能、介电性能以及光热转化性能进行表征和分析。结果表明:在12.1 GHz下,纬纱采用2根玻璃纤维和单根碳纤维交替排列织造的G/C织物复合材料的屏蔽效能高达38.7 dB;G/C织物复合材料的组织结构变化可有效调控多种介电极化弛豫机制;G/C织物复合材料表面温度在模拟日光氙灯光源照射下响应速度快,其中玻璃纤维和碳纤维单根交替排列的G/C织物复合材料在2 kW/m^(2)光照强度下照射300 s时,其表面温度可达71.8℃。Objective The electromagnetic(EM) wave pollution and its secondary reflection bring great threat to human health and to information security. To reduce the secondary reflection pollution of carbon fiber fabric composites, enhancing the impedance matching of carbon fiber fabric is a feasible method. Method Glass fiber has low dielectric properties;the impedance matching of carbon fiber fabric could be improved by using glass fiber to regulate the fabric structure of the carbon fiber fabric. In this work, five different fabric structures of glass fiber/carbon fiber(G/C) fabric were designed and were compounded with waterborne polyurethane. The morphology, electromagnetic interference(EMI) shielding, dielectric and photothermal conversion properties of glass fiber/carbon fiber composites were characterized by an ultra-depth of field microscope, vector network analyzer, simulated solar xenon lamp light source system and infrared thermal imager. Results Glass fiber and carbon fiber interweave with each other to form the G/C fabrics structure which was arranged smoothly as illustrated in Fig. 1. The EMI shielding efficiency(SE) of the five G/C fabric composites showed effective EMI shielding. Their average EMI SE was greater than 20.0 dB in the X band(8.2-12.4 GHz) as can be seen in Fig. 3(a). The EMI total shielding efficiency(SET) curves of C fabric(its weft yarns are all carbon fiber) composites was relatively stable, with its SETbeing 33.4 dB at 9.6 GHz(Fig. 2(a)). The SETcurves of G/C fabrics composites decreased firstly and then increased with the increasing frequency within X band after the introduction of glass fiber. The EMI SE value of G2C1 fabric(glass and carbon yarns were woven into the fabric alternately as weft) composite was up to 38.7 dB at 12.1 GHz, as shown in Fig. 2(a). The power coefficients values of absorptivity of G/C fabric composites increased by adding glass fiber. The structural changes in G/C fabric composites effectively regulate various dielectric polarization relaxation mechanisms(Fig. 5
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