Pub Date : 2024-02-01DOI: 10.1177/14658011231218951
Beixue Yang, Zhangbin Yang, Z. Zhou, Jun Zhang, Jianning Bao
Conductive polymer composites (CPCs) are promising alternatives to metal conductive materials due to their light-weight and low-cost. This work investigates the effect of the crystallization behavior of the matrix on the electrical property of CPCs, where semi-crystalline polypropylene (PP) and amorphous styrene-butadiene-styrene tri-block copolymer (SBS) are selected as a matrix, respectively, and conductive carbon black (CB) particles are introduced into matrixes by melting blending. Based on the electrical properties of CPCs with various CB contents and percolation theory, the percolation threshold of 1.8 vol% in PP matrix composites is obtained, much lower than that of SBS matrix composites (5.4 vol%). The analysis with a polarizing microscope and differential scanning calorimeter confirms that such a significant difference in percolation threshold between two composites is due to the crystallization behavior while the crystallization induced segregated structure is proposed. Finally, the rheology behaviors and mechanical properties are characterized for microstructures and applications, respectively.
导电聚合物复合材料（CPC）因其重量轻、成本低而有望成为金属导电材料的替代品。本研究以半结晶聚丙烯（PP）和无定形苯乙烯-丁二烯-苯乙烯三嵌段共聚物（SBS）为基体，通过熔融共混将导电炭黑（CB）颗粒引入基体，研究了基体结晶行为对导电聚合物复合材料电性能的影响。根据不同 CB 含量的 CPC 的电性能和渗流理论，得出 PP 基复合材料的渗流阈值为 1.8vol%，远低于 SBS 基复合材料的渗流阈值（5.4vol%）。偏光显微镜和差示扫描量热仪的分析证实，两种复合材料渗流阈值的显著差异是由结晶行为引起的，同时提出了结晶诱导的偏析结构。最后，分别对微结构和应用的流变行为和机械性能进行了表征。
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Pub Date : 2024-02-01DOI: 10.1177/14658011231212629
Mohammed Tweissi, J. M. Khoshman, Husam Miqdad, A. Adaileh
The electrical and thermal conductivities as well as Lorenz number of polyvinyl alcohol (PVA) composites have been investigated at different concentrations of the copper chloride II (0, 1, 3, 5, 7 and 12 wt-%). The powder of copper chloride II (CuCl2) was casted with the PVA polymer1. The electrical conductivity was measured by using the impedance technique, and it was studied as functions of the CuCl2 concentrations, applied frequency range of 100–7000 kHz, and temperature range of 30–100 °C. The activation energy ( Ea) was also determined for all the studied samples at applied frequency of 1000 kHz. It was found that the Ea decreased with increasing the CuCl2 concentration. Moreover, the thermal conductivity of the samples was studied as functions of the CuCl2 concentration and temperature. It was found that the thermal conductivity increased with increasing the CuCl2 concentrations and temperature. Using the measured values of the thermal and electrical conductivities of the studied samples, the relationship between the Lorenz number ( L) of the PVA and CuCl2 concentrations with constant temperature was also studied based on the Wiedemann–Franz law. The results showed that the L number increased with CuCl2 concentrations increase at constant temperature.
{"title":"Determination of Lorenz number of composite films based on copper chloride(II) in polyvinyl alcohol matrix","authors":"Mohammed Tweissi, J. M. Khoshman, Husam Miqdad, A. Adaileh","doi":"10.1177/14658011231212629","DOIUrl":"https://doi.org/10.1177/14658011231212629","url":null,"abstract":"The electrical and thermal conductivities as well as Lorenz number of polyvinyl alcohol (PVA) composites have been investigated at different concentrations of the copper chloride II (0, 1, 3, 5, 7 and 12 wt-%). The powder of copper chloride II (CuCl2) was casted with the PVA polymer1. The electrical conductivity was measured by using the impedance technique, and it was studied as functions of the CuCl2 concentrations, applied frequency range of 100–7000 kHz, and temperature range of 30–100 °C. The activation energy ( Ea) was also determined for all the studied samples at applied frequency of 1000 kHz. It was found that the Ea decreased with increasing the CuCl2 concentration. Moreover, the thermal conductivity of the samples was studied as functions of the CuCl2 concentration and temperature. It was found that the thermal conductivity increased with increasing the CuCl2 concentrations and temperature. Using the measured values of the thermal and electrical conductivities of the studied samples, the relationship between the Lorenz number ( L) of the PVA and CuCl2 concentrations with constant temperature was also studied based on the Wiedemann–Franz law. The results showed that the L number increased with CuCl2 concentrations increase at constant temperature.","PeriodicalId":518051,"journal":{"name":"Plastics, Rubber and Composites: Macromolecular Engineering","volume":"260 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140529023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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