Conductive polymer composites (CPCs) are highly desirable to address the electromagnetic radiation and heat accumulation issue associated with highly integrated electronics. However, it remains challenging to achieve high electromagnetic interference shielding effectiveness (EMI SE) while maintaining desirable thermal management performance in CPCs. Herein, we report an effective and adaptive strategy to construct a conductive pathway of graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) within the acrylonitrile-butadiene-styrene (ABS) matrix using Pickering emulsion as a designer platform. The non-covalently driven “fish-net” assembly of regenerated cellulose (RC) and GNP/CNT at the emulsion interface results in a continuous three-dimensional (3D) conductive network within the ABS matrix after solvent diffusion and hot-compressing. As expected, the resultant composites exhibit high electrical conductivity of 261.1 S/m and excellent thermal conductivity of 4.17 W/mK at 27.8 wt% GNPs and 3 wt% CNTs loadings. Owing to the absorption-dominant shielding mechanism, a maximum EMI SE of 73.5 dB can be achieved. The versatility of this strategy for constructing EMI shielding composites has been demonstrated using various polymer matrix. Therefore, the Pickering emulsion-based strategy exhibits great potential in fabricating high-performance dually-conductive EMI shielding materials for the applications in artificial intelligence, aerospace, military and so on.
{"title":"Acrylonitrile-Butadiene-Styrene-Based Composites Derived from 'Fish-Net'-Inspired Pickering Emulsion for High-Performance Electromagnetic Interference Shielding and Thermal Management","authors":"Yating Wang, Ziyan Xin, Jiajun Shen, Lunyu Zhao, Bijia Wang, Xueling Feng, Zhiping Mao, X. Sui","doi":"10.2139/ssrn.3927039","DOIUrl":"https://doi.org/10.2139/ssrn.3927039","url":null,"abstract":"Conductive polymer composites (CPCs) are highly desirable to address the electromagnetic radiation and heat accumulation issue associated with highly integrated electronics. However, it remains challenging to achieve high electromagnetic interference shielding effectiveness (EMI SE) while maintaining desirable thermal management performance in CPCs. Herein, we report an effective and adaptive strategy to construct a conductive pathway of graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) within the acrylonitrile-butadiene-styrene (ABS) matrix using Pickering emulsion as a designer platform. The non-covalently driven “fish-net” assembly of regenerated cellulose (RC) and GNP/CNT at the emulsion interface results in a continuous three-dimensional (3D) conductive network within the ABS matrix after solvent diffusion and hot-compressing. As expected, the resultant composites exhibit high electrical conductivity of 261.1 S/m and excellent thermal conductivity of 4.17 W/mK at 27.8 wt% GNPs and 3 wt% CNTs loadings. Owing to the absorption-dominant shielding mechanism, a maximum EMI SE of 73.5 dB can be achieved. The versatility of this strategy for constructing EMI shielding composites has been demonstrated using various polymer matrix. Therefore, the Pickering emulsion-based strategy exhibits great potential in fabricating high-performance dually-conductive EMI shielding materials for the applications in artificial intelligence, aerospace, military and so on.","PeriodicalId":269237,"journal":{"name":"MatSciRN: Advanced Composites (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132044606","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}
The work is devoted to the mathematical modeling of a three-layer beam. A generalization of the "broken-line" hypothesis describing the displacement field is proposed and used to analyze the problem of dynamic stability. Based on Hamilton's principle, equations of motion are obtained. Then this system of two differential equations is approximately solved. In this way, the fundamental natural frequency and two unstable regions are obtained.
{"title":"Dynamic stability of a three-layer beam – Generalization of the sandwich structures theory","authors":"K. Magnucki, E. Magnucka-Blandzi","doi":"10.2139/ssrn.3868174","DOIUrl":"https://doi.org/10.2139/ssrn.3868174","url":null,"abstract":"The work is devoted to the mathematical modeling of a three-layer beam. A generalization of the \"broken-line\" hypothesis describing the displacement field is proposed and used to analyze the problem of dynamic stability. Based on Hamilton's principle, equations of motion are obtained. Then this system of two differential equations is approximately solved. In this way, the fundamental natural frequency and two unstable regions are obtained.","PeriodicalId":269237,"journal":{"name":"MatSciRN: Advanced Composites (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131642556","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}
Currently day by day most of the mechanical and supporting structures being replaced with the composite materials due to their dominating mechanical strength to weight ratio. The properties of the composite material depends on the type of the fiber i.e., natural or synthetic, size of the fiber (short or long), type of the resin etc and so on. The specialized properties are in demand by most of the industries can be achieved by using the hybrid polymer composites. The chemical or alkali treatment of natural fibers affects the properties of the composite material. The bonding agents between different compounds in the composite material also play the vital role in changing the properties of the composite material. In the present work, the effect of the chemical treatment and coupling agents on the properties of the hybrid composite material were studied. Sodium hydroxide is used as chemical treatment agent and maleic anhydride polypropylene (MAPP) used as coupling agent. Coir/banana short fiber hybrid composite with polypropylene matrix is used as composite material. The effects of these agents on the tensile strength, Young’s modulus, flexural strength, flexural modulus and impact strength have been studied.
{"title":"Imapact of Chemical Treatment and Bonding Agents on Mechanical Behavior of Polymer-Coir/Banana Natural Cellulose Fiber Hybrid Composite","authors":"H. Rao, D. P. Chavhan","doi":"10.2139/ssrn.3703889","DOIUrl":"https://doi.org/10.2139/ssrn.3703889","url":null,"abstract":"Currently day by day most of the mechanical and supporting structures being replaced with the composite materials due to their dominating mechanical strength to weight ratio. The properties of the composite material depends on the type of the fiber i.e., natural or synthetic, size of the fiber (short or long), type of the resin etc and so on. The specialized properties are in demand by most of the industries can be achieved by using the hybrid polymer composites. The chemical or alkali treatment of natural fibers affects the properties of the composite material. The bonding agents between different compounds in the composite material also play the vital role in changing the properties of the composite material. In the present work, the effect of the chemical treatment and coupling agents on the properties of the hybrid composite material were studied. Sodium hydroxide is used as chemical treatment agent and maleic anhydride polypropylene (MAPP) used as coupling agent. Coir/banana short fiber hybrid composite with polypropylene matrix is used as composite material. The effects of these agents on the tensile strength, Young’s modulus, flexural strength, flexural modulus and impact strength have been studied.","PeriodicalId":269237,"journal":{"name":"MatSciRN: Advanced Composites (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117093202","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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