{"title":"通过动态交联重洗牌增强分隔导电弹性泡沫的界面粘合:开发高灵敏度压阻传感器","authors":"Lihong Geng, Yufeng Liu, Pinchuan Ma, Jianming Wu, Xin Chen, Chunlin Deng* and Xiangfang Peng*, ","doi":"10.1021/acsapm.4c01083","DOIUrl":null,"url":null,"abstract":"<p >Conductive polymer composites with a segregated structure have been developed for flexible piezoresistive sensors, but segregated composites usually suffer from the problem of poor interfacial bonding. In this work, ethylene-vinyl acetate copolymer (EVA)/carbon nanotube (CNT)/hydroxylated carbon nanotube (CNT-OH) composites with segregated structures were prepared by ball-milled coating and the following hot-press molding, in which dynamic boron-centered three-dimensional cross-linking networks were constructed in EVA granules. The interfacial bonding was significantly improved by molecular bridges at the interface based on thermo-activated transesterification between CNT-OH and EVA vitrimer granules. As a result, the composites with the ratio of CNT to CNT-OH of 3:1 showed a superior elongation-at-break of 563.69%, strength of 12.6 MPa, and conductivity of 13.6 S/m. Furthermore, a 3D porous structure was constructed in the EVA composites by supercritical carbon dioxide foaming. Benefiting from the segregated conductive structure and strong interfacial bonding, the segregated conductive EVA foams exhibited an excellent piezoresistive sensing sensitivity with a GF of −23.6 and compression stability. It provided an approach for interface strengthening of segregated conductive polymer composites, and the resulting conductive foams exhibited great potential for the application as a flexible piezoresistive sensor.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced Interface Bonding of Segregated Conductive Elastomeric Foams by Dynamic Cross-Linking Reshuffling: Toward Highly Sensitive Piezoresistive Sensors\",\"authors\":\"Lihong Geng, Yufeng Liu, Pinchuan Ma, Jianming Wu, Xin Chen, Chunlin Deng* and Xiangfang Peng*, \",\"doi\":\"10.1021/acsapm.4c01083\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Conductive polymer composites with a segregated structure have been developed for flexible piezoresistive sensors, but segregated composites usually suffer from the problem of poor interfacial bonding. In this work, ethylene-vinyl acetate copolymer (EVA)/carbon nanotube (CNT)/hydroxylated carbon nanotube (CNT-OH) composites with segregated structures were prepared by ball-milled coating and the following hot-press molding, in which dynamic boron-centered three-dimensional cross-linking networks were constructed in EVA granules. The interfacial bonding was significantly improved by molecular bridges at the interface based on thermo-activated transesterification between CNT-OH and EVA vitrimer granules. As a result, the composites with the ratio of CNT to CNT-OH of 3:1 showed a superior elongation-at-break of 563.69%, strength of 12.6 MPa, and conductivity of 13.6 S/m. Furthermore, a 3D porous structure was constructed in the EVA composites by supercritical carbon dioxide foaming. Benefiting from the segregated conductive structure and strong interfacial bonding, the segregated conductive EVA foams exhibited an excellent piezoresistive sensing sensitivity with a GF of −23.6 and compression stability. It provided an approach for interface strengthening of segregated conductive polymer composites, and the resulting conductive foams exhibited great potential for the application as a flexible piezoresistive sensor.</p>\",\"PeriodicalId\":7,\"journal\":{\"name\":\"ACS Applied Polymer Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2024-06-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Polymer Materials\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsapm.4c01083\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Polymer Materials","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsapm.4c01083","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
目前已开发出具有离析结构的导电聚合物复合材料,可用于柔性压阻传感器,但离析复合材料通常存在界面结合力差的问题。本研究通过球磨涂覆和热压成型制备了具有离析结构的乙烯-醋酸乙烯共聚物(EVA)/碳纳米管(CNT)/羟基碳纳米管(CNT-OH)复合材料,在 EVA 颗粒中构建了以硼为中心的动态三维交联网络。基于 CNT-OH 和 EVA 维聚物颗粒之间热激活的酯交换反应,界面上的分子桥显著改善了界面粘合。结果,CNT 与 CNT-OH 的比例为 3:1,复合材料的断裂伸长率达到 563.69%,强度达到 12.6 兆帕,导电率达到 13.6 S/m。此外,还通过超临界二氧化碳发泡在 EVA 复合材料中构建了三维多孔结构。得益于离析导电结构和强大的界面结合力,离析导电 EVA 泡沫表现出卓越的压阻传感灵敏度(GF 为 -23.6)和压缩稳定性。该研究为离析导电聚合物复合材料的界面强化提供了一种方法,所制备的导电泡沫在用作柔性压阻传感器方面具有巨大潜力。
Enhanced Interface Bonding of Segregated Conductive Elastomeric Foams by Dynamic Cross-Linking Reshuffling: Toward Highly Sensitive Piezoresistive Sensors
Conductive polymer composites with a segregated structure have been developed for flexible piezoresistive sensors, but segregated composites usually suffer from the problem of poor interfacial bonding. In this work, ethylene-vinyl acetate copolymer (EVA)/carbon nanotube (CNT)/hydroxylated carbon nanotube (CNT-OH) composites with segregated structures were prepared by ball-milled coating and the following hot-press molding, in which dynamic boron-centered three-dimensional cross-linking networks were constructed in EVA granules. The interfacial bonding was significantly improved by molecular bridges at the interface based on thermo-activated transesterification between CNT-OH and EVA vitrimer granules. As a result, the composites with the ratio of CNT to CNT-OH of 3:1 showed a superior elongation-at-break of 563.69%, strength of 12.6 MPa, and conductivity of 13.6 S/m. Furthermore, a 3D porous structure was constructed in the EVA composites by supercritical carbon dioxide foaming. Benefiting from the segregated conductive structure and strong interfacial bonding, the segregated conductive EVA foams exhibited an excellent piezoresistive sensing sensitivity with a GF of −23.6 and compression stability. It provided an approach for interface strengthening of segregated conductive polymer composites, and the resulting conductive foams exhibited great potential for the application as a flexible piezoresistive sensor.
期刊介绍:
ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers.
The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.