期刊
COMPOSITES PART B-ENGINEERING
卷 211, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108664
关键词
Eco-friendly; Smoke suppression; Flame-retardant; Synergistic cross-linking; Polymer
资金
- National Natural Science Foundation of China [21634006, 51991351, 51991350, 51827803, 52003167]
- National Key Research and Development Program of China [2019YFD1101201, 2017YFB0309001]
- Fundamental Research Funds for the central Universities
- Young Elite Scientists Sponsorship Program by CAST
A novel green strategy was proposed to improve the flame retardancy of polymeric materials without using conventional flame-retardant elements, leading to a PN copolymer with significantly lower smoke and heat release rates as well as excellent anti-dripping performance. This eco-friendly synergistic cross-linking strategy offered a new perspective for the design and synthesis of polymeric materials with outstanding flame retardancy and reduced release of heat, smoke, and toxic gas.
Conventional methods to improve the flame retardancy of polymeric materials usually involve the use of flame-retardant elements such as Cl, Br and P, however, their use may bring more smoke and toxic gases hazards, and more importantly, cause non-negligible environmental and ecological problems. In this work, we put forward a novel green strategy that eliminates the use of any conventional flame-retardant elements to improve the flame retardancy by incorporating a synergistically cross-linkable structure (named PN) containing phenylacetylene and phenylimide groups. The resulting PN copolymer exhibited an excellent 55% lower smoke release rate and 68% lower heat release rate than the pure polymer, as well as a high LOI value of 32% and UL-94 V-0 rating with excellent anti-dripping performance. TG-DSC, rheological and FTIR results proved the high cross-linking ability of the PN copolymer due to the synergistic cross-linking effect between the imide-isoimide rearrangement of phenylimide and the self-cross-linking of phenylacetylene. The SEM, Raman and Py-GC/MS results further upheld the condensed phase flame-retardant mechanism. This eco-friendly synergistic cross-linking strategy provided new perspective for the design and synthesis of polymeric materials with excellent flame retardancy, great anti-dripping performance, and low release of heat, smoke, and toxic gas.
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