Amorphous cobalt borate nanosheets grown on MoS2 nanosheet for simultaneously improving the flame retardancy and mechanical properties of polyacrylonitrile composite fiber. (15th November 2020)

• Record Type: Journal Article
• Authors: Peng, Hongyun; Wang, Dong; Zhang, Liping; Li, Min; Liu, Mingming; Wang, Chunxia; Fu, Shaohai
• Is Part Of: Composites. Number 201(2020)
• Publication Date: 2020-11-15
• Subjects: Cobalt borate nanosheets -- MoS2 -- Polyacrylonitrile fiber -- Flame retardancy; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2020.108298
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: 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 flame-retardant 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 CoBi-MoS2 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. Graphical abstract: Image 1