Multifunctional microcellular PVDF/Ni-chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance
Multifunctional microcellular PVDF/Ni-chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance
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具有增强电磁干扰屏蔽和优异隔热性能的多功能微孔PVDF/镍链复合泡沫
DOI：
10.1016/j.cej.2019.122304
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发表时间：
2020
影响因子：
15.1
通讯作者：
Kim Jang-Kyo
中科院分区：
文献类型：
--
作者：
Zhang Hongming;Zhang Guangcheng;Gao Qiang;Tang Meng;Ma Zhonglei;Qin Jianbin;Wang Mingyue;Kim Jang-Kyo
轻质多功能聚偏氟乙烯/镍链采用多步法制备了具有良好力学性能、优异隔热性能和电磁干扰屏蔽性能的聚偏氟乙烯（PVDF）/镍链复合泡沫材料。（a）高纵横比Ni链的可控合成，（B）引入到PVDF基体中的Ni链，（c）复合材料样品的结晶度定制，（d）经处理的复合材料的超临界二氧化碳发泡。利用热处理和纳米填料的存在效应来调节半结晶PVDF的结晶度和晶体结构。通过优化预处理工艺和发泡工艺，成功制备了具有均匀闭孔微孔结构的PVDF/Ni链复合轻质泡沫材料。PVDF/10 wt% Ni链泡沫材料具有独特的多孔结构，可降低其质量密度（~1.0 g/cm 3）、提高其拉伸强度（~42.0 MPa）、提高其电导率（~0.01 S/m）上级隔热性能（~0.075 W/（m·K））。此外，导电磁性PVDF/10重量%的镍链泡沫具有26.8 dB的高EMI屏蔽效能和127.62 dB cm 2/g的突出的比屏蔽效能（SSE），在X波段区域具有吸收主导的屏蔽功能。这种增强的吸收归因于由独特的多孔结构和凝聚的镍链网络引起的多次反射、介电损耗、极化损耗和磁损耗。本研究为设计新型、轻质、隔热、高效的电磁屏蔽复合泡沫材料提供了一种低成本、可规模化的方法，该泡沫材料具有优化的微孔结构和导磁镍链网络，在建筑、航空航天和电子等领域具有良好的前景。
Lightweight and multifunctional polyvinylidene fluoride/Nickel-chains (PVDF/Ni-chains) composite foams with good mechanical property, excellent thermal insulation and outstanding electromagnetic interference (EMI) shielding performance (SE) were prepared by a multi-step process including: (a) controllable synthesis of high-aspect-ratio Ni-chains, (b) Ni-chains introduced into PVDF matrix, (c) crystallinity tailoring of composite samples, (d) supercritical carbon dioxide foaming of the treated composites. Thermal treating and nanofiller existence effect are applied to tune the degree of crystallinity and crystal structures of semi-crystalline PVDF. Notably, with the optimized pre-treatment and foaming process, lightweight PVDF/Ni-chains composite foams with uniform closed-cell microcellular morphology were successfully developed. Thanks to the unique porous morphology, PVDF/10 wt% Ni-chains foams present decreased mass density (~1.0 g/cm3), high tensile strength (~42.0 MPa), enhanced electrical conductivity (~0.01 S/m) and superior thermal insulation performance (~0.075 W/(m·K)). Furthermore, conductive-magnetic PVDF/10 wt% Ni-chains foam exhibits a high EMI shielding effectiveness of 26.8 dB and an outstanding specific shielding effectiveness (SSE) of 127.62 dB cm2/g, with an absorption-dominated shielding feature in X-band region. The enhanced absorption is attributed to the multiple reflections, dielectric loss, polarization loss and magnetic loss originated from the unique porous structure and condensed Ni-chains networks. This study paves a low-cost and scalable method for the design of novel, lightweight, thermal insulation and efficient EMI shielding composite foams characterized by optimized microcellular structure and conductive-magnetic Ni-chains networks with promising prospect for applications in construction, aerospace and electronics filed.
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影响因子：
15.1
作者：
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通讯作者：
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影响因子：
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