期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 142, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106242
关键词
Alternating convergent-divergent flow; Steam explosion; Expanded graphite; Melt exfoliation
资金
- Key Program of National Natural Science Foundation of China [51933004]
- National Key Research and Development Program of China [2016YFB0302300]
- Natural Science Foundation of Guangdong Province, China [2018A030313275, 2017A030313270]
- Basic and Applied Basic Research Fund of Guangdong Province, China [2019A1515110962]
A one-step melt mixing strategy is developed based on the synergism of steam explosion and alternating convergent-divergent flow to fabricate high-performance HDPE/EG nanocomposites within 4 minutes. The nanocomposites feature excellent mechanical and electrical properties, with low dielectric loss even with increased EG content, showing potential for 5G communication materials.
A one-step melt mixing strategy based on the synergism of steam explosion and alternating convergent-divergent flow, is innovatively developed to fabricate high-performance high-density polyethylene (HDPE)/expanded graphite (EG) nanocomposites within 4 min, without any chemical reagents or complex pretreatments. A successful synergy of the external forces from surrounding elongational melts and the internal forces from steam explosion results in EG rapidly exfoliating into few-layer graphene and simultaneously dispersing in HDPE evenly. The thinnest exfoliated EG reaches two-layer graphene (1.4 nm). Benefit from excellent exfoliation and dispersion effect, the nanocomposites feature low melt resistance and relaxation time, good ductility. Furthermore, the nanocomposites obtain a greater increment of dielectric constant as more EG adding, but always maintain an extremely low dielectric loss (<0.01), exhibiting a potential for 5G communication materials. This strategy provides a promising pathway for industrially producing functional nanocomposites with high-content fillers and manufacturing nanosheets via melt-exfoliating 2D layered materials.
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