Synergistic effect of bismuth oxide and mono‐component intumescent flame retardant on the flammability and smoke suppression properties of epoxy resins. (15th August 2019)

• Record Type: Journal Article
• Authors: Xu, Zhisheng; Jia, Hongyu; Yan, Long; Chu, Zhiyong; Zhou, Huan
• Is Part Of: Polymers for advanced technologies. Volume 31:Number 1(2020)
• Page Start: 25
• Page End: 35
• Publication Date: 2019-08-15
• Subjects: bismuth oxide -- epoxy resin -- flammability -- pentaerythritol phosphate melamine salt -- thermal property; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.4744
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract : A novel mono‐component intumescent flame retardant named pentaerythritol phosphate melamine salt (PPMS)‐hybrid bismuth oxide (PPMS‐Bi2 O3 ) was synthesized and carefully characterized by FTIR, 1 H NMR, 31 P NMR, SEM‐EDS, and TG analyses. Then, PPMS‐Bi2 O3 was utilized as flame retardant for epoxy resins (EPs), and the thermal stability, flame retardancy, and smoke suppression properties of EP composites were investigated. TG results show that PPMS‐Bi2 O3 is more conducive to enhance the thermal stability and char forming ability of EP composites compared with the same addition of PPMS or the mixture of PPMS and Bi2 O3, and this positive effect is enhanced with the increasing Bi2 O3 content. Cone calorimeter test reveals that the PPMS‐Bi2 O3 can effectively reduce the heat release and smoke production in comparison with PPMS or the mixture of PPMS and Bi2 O3 due to the formation of a more compact and intumescent char against fire, as judged by digital photographs and SEM images. EDS analysis indicates that the combination PPMS and Bi2 O3 by hydrogen bonds promotes to generate more phosphorus‐rich and aromatization structures in the condensed phase that enhance the barrier effect and anti‐oxidation ability of the char, thus imparting higher flame retardant and smoke suppression efficiencies to EP composites.