A strategy to construct multifunctional ammonium polyphosphate for epoxy resin with simultaneously high fire safety and mechanical properties. (October 2021)

• Record Type: Journal Article
• Authors: Shao, Zhu-Bao; Zhang, Jing; Jian, Rong-Kun; Sun, Chang-Chun; Li, Xiao-Lu; Wang, De-Yi
• Is Part Of: Composites. Volume 149(2021)
• Publication Date: 2021-10
• Subjects: Epoxy resin -- Smoke suppression -- Fire safety -- Mechanical properties; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2021.106529
• Languages: English
• ISSNs: 1359-835X

Abstract

Highlights: Metal organic framework chemical modification of APP (ZIF-67@APP) was prepared. ZIF-67@APP presented good interfacial compatibility with epoxy resin (EP). Heat release and smoke production of ZIF-67@APP/EP were greatly decreased. ZIF-67@APP exerted the catalytic charring effect during combustion of EP. Abstract: Obtaining a well balance between the high fire safety and mechanical performance of epoxy resins (EP) is still a challenge for the traditionally intumescent flame retardant. Herein, a new strategy was constructed to realize the highly uniform dispersion of zeolitic imidazolate framework-67 (ZIF-67) on the ammonium polyphosphate (APP) through the coordination reaction of the pre-bonded Co 2+ cations with phosphate and 2-methyimidazole. The as-obtained ZIF-67@APP in the loading of 5 wt% endowed EP with a LOI value of 28.5% and UL-94 V0. Furthermore, peak of heat release rate (PHRR) and smoke production rate (SPR) of ZIF-67@APP/EP were greatly decreased by 67.4% and 46.2% compared to EP with 5 wt% APP. The improved fire safety of ZIF-67@APP/EP was ascribed to the faster formation of the expanded char owing to the catalysis of cobalt cation. Meanwhile, the good compatibility between ZIF-67@APP and EP also presented better mechanical properties.