Journal
COMPOSITES PART B-ENGINEERING
Volume 201, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.108298
Keywords
Cobalt borate nanosheets; MoS2; Polyacrylonitrile fiber; Flame retardancy
Funding
- Natural Science Foundation of Jiangsu Province [BK20190613]
- Fundamental Research Funds for the Central Universities [JUSRP11802]
- National Natural Science Foundation of China [51703208]
- National Key R&D Program of China [2018YFC1902105]
- Basic Research Program of Jiangnan University [JUSRP21933]
- Jiangnan University
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It is a great challenge to achieve efficient flame retardance with no mechanical deterioration to polymers. In this study, novel sandwich-like cobalt borate nanosheets-molybdenum disulfide (CoBi-MoS2) hybrids are synthesized by a facile aqueous-phase synthesis approach at room-temperature, and employed as nanofillers for PAN fiber. The amorphous CoBi nanosheet with surface Lewis pairs and potential flame-retardant characteristics acts as interfacial compatibilizer and cooperative flame-retardant, enabling simultaneous improvement in both flameretardant and mechanical properties of 2 wt% CoBi-MoS2/PAN composite fiber. Compared with pure PAN fiber, the peak heat release rate, peak smoke production rate and peak CO production rate of 2 wt% CoBi-MoS2/PAN composite fiber are decreased by 46.2%, 45.7% and 62.9%, respectively. The gaseous and condensed phase analysis reveals that the catalytic redox activity, cross-linked charring and physical barrier effect of the CoBiMoS2 are responsible for the flame-retardant enhancements of PAN composite fiber. Simultaneously, the 2 wt% CoBi-MoS2/PAN composite fiber exhibits a 58.7% and 49.1% improvement in tensile strength and elongation at break compared to pure PAN fiber.
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