Journal
MATERIALS & DESIGN
Volume 112, Issue -, Pages 383-391Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.09.096
Keywords
Carbon fiber; Fabric; Electrical conductivity; Nonwoven; Percolation threshold; Stick network
Categories
Funding
- National Natural Science Foundation of China [51375175, U1401249]
- Natural Science Foundation of Guangdong Province, China [2015A030313201, 2014A030312017]
- Science and Technology Planning Project of Guangdong Province, China [2015A010105007]
- Fundamental Research Funds for the Central Universities
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Carbon fiber (CF) nonwoven fabric, due to its mechanical robustness, compact structure and remarkable electrical properties, can be used as an electrode for energy storage devices and as a functional layer for electromagnetic interference (EMI) shielding equipment. To enhance the flexibility of CF nonwoven fabrics, a polypropylene/polyethylene (PP/PE) core/sheath bicomponent fiber (commercially known as PP/PE side by side fiber, simplified as ESF) was incorporated into the fabric to form a CF-ESFs composite. Using a two-stepwet papermaking/thermal bonding process, we synthesized a highly flexible, and highly conductive nonwoven fabric, called CF-ESF nonwoven fabric (CEF-NF). Pure CF nonwoven fabrics and CEF-NFs were fully characterized via scanning electron microscopy, to understand and validate the improvement in tensile strength due to the incorporation of ESFs. The electrical conductivity of the CEF-NFwas measured to elucidate the effect of heat pressing and to investigate its importance in enhancing the electrical conductivity of a CEF-NF. Lastly, we found the electrical conductivity of CEF-NFs increased with increasing fiber lengths and higher CF volume density. A theoretical model was established to express the relation between the electrical conductivity and CF concentration. From this model, we located the percolation threshold for the CF concentration of a CEF-NF. (C) 2016 Elsevier Ltd. All rights reserved.
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