TY - JOUR
T1 - Multifunctional microcellular PVDF/Ni-chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance
AU - Zhang, Hongming
AU - Zhang, Guangcheng
AU - Gao, Q.
AU - Tang, Meng
AU - Ma, Zhonglei
AU - Qin, Jianbin
AU - Wang, Mingyue
AU - Kim, Jang Kyo
N1 - Funding Information:
The authors are grateful to the National Natural Science Foundation of China (Grant No. 51773170) and the Undergraduate Innovation & Business Program in Northwestern Polytechnical University (No. ZZ2018186). We would like to thank the Analytical& Testing Center of Northwestern Polytechnical University for equipment supporting and Anhui Kemi Machinery Technology Co. Ltd for the 100 ml high-pressure vessel.
Funding Information:
The authors are grateful to the National Natural Science Foundation of China (Grant No. 51773170 ) and the Undergraduate Innovation & Business Program in Northwestern Polytechnical University (No. ZZ2018186 ). We would like to thank the Analytical& Testing Center of Northwestern Polytechnical University for equipment supporting and Anhui Kemi Machinery Technology Co., Ltd for the 100 ml high-pressure vessel.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - 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.
AB - 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.
KW - Electromagnetic shielding interference
KW - Microcellular foaming
KW - Nickel chains
KW - Polyvinylidene fluoride
KW - Thermal insulation
UR - http://www.scopus.com/inward/record.url?scp=85069720692&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.122304
DO - 10.1016/j.cej.2019.122304
M3 - Article
AN - SCOPUS:85069720692
SN - 1385-8947
VL - 379
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 122304
ER -