Multiple layered PVDF-CNTs foams with gradient structure and high electromagnetic shielding performance

IF 2.6 4区 化学 Q3 POLYMER SCIENCE
Yongbo Si, Kun Li, Zihao Ding, Shixun Zhang, Xiaoli Zhang, Xia Liao, Yang Yang, Xiaoqin Guo, Jingbo Chen
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引用次数: 0

Abstract

Multiple layered PVDF-CNTs with different CNTs were prepared by facile melt blending process. Due to varied electrical conductivity in each layer, incident electromagnetic (EM) waves could be reflected and absorbed between these layers, and thus their electromagnetic interference (EMI) efficiency was obviously improved. EMI shielding effectiveness of a three- layered PVDF-CNTs with CNTs content of 6, 8, 10 wt. % sequentially, is 36.4 dB, compared to a 27.2 dB of single layered PVDF-8CNTs with a same sample thickness of 2 mm, an increase of 34% was induced. Furthermore, based on different viscoelasticity of PVDF-CNTs with various CNTs content, three- layered PVDF-6–8-10 CNTs foams with a gradient cell structure and thickness of 2 mm, were manufactured by an environment friendly supercritical CO2 batch foaming method, an absolute EM SE value of 35.2 dB at a frequency of 26 GHz was measured. Because of the introduction of microcellular sized cells, the electromagnetic waves were absorbed and reflected inside the cells, cooperated with the multiple reflections between different layers, an increased absorption dominated mechanism in these foamed PVDF-CNTs composites was resulted, which means a successful mechanism transformation from reflection to absorption after foaming.

Abstract Image

Abstract Image

具有梯度结构和高电磁屏蔽性能的多层 PVDF-CNTs 泡沫
通过简便的熔融混合工艺制备了含有不同 CNT 的多层 PVDF-CNT。由于各层的导电率不同,入射电磁波可在这些层之间被反射和吸收,从而明显提高了电磁干扰(EMI)效率。CNTs 含量依次为 6、8、10 wt. % 的三层 PVDF-CNTs 的 EMI 屏蔽效果为 36.4 dB,与相同样品厚度(2 mm)的单层 PVDF-8CNTs 的 27.2 dB 相比,提高了 34%。此外,基于不同 CNTs 含量的 PVDF-CNTs 的不同粘弹性,采用环境友好型超临界 CO2 批量发泡法制造了梯度单元结构、厚度为 2 mm 的三层 PVDF-6-8-10 CNTs 泡沫,在 26 GHz 频率下测得绝对 EM SE 值为 35.2 dB。由于引入了微孔尺寸的单元,电磁波在单元内被吸收和反射,再加上不同层间的多重反射,这些发泡的 PVDF-CNTs 复合材料中出现了以吸收为主的增强机制,这意味着发泡后成功实现了从反射到吸收的机制转变。
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来源期刊
Journal of Polymer Research
Journal of Polymer Research 化学-高分子科学
CiteScore
4.70
自引率
7.10%
发文量
472
审稿时长
3.6 months
期刊介绍: Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.
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