Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 149, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106529
Keywords
Epoxy resin; Smoke suppression; Fire safety; Mechanical properties
Funding
- National Natural Science Foundation of China [22075045, 51673132]
- State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) [G2RC202013]
- Open Foundation of Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics [PQETGP2020004]
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A new strategy was developed to achieve highly uniform dispersion of ZIF-67 on APP, enhancing the fire safety and mechanical properties of EP. The improved performance of ZIF-67@APP/EP was attributed to faster char formation due to cobalt cation catalysis, as well as good compatibility between ZIF-67@APP and EP.
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 Co2+ cations with phosphate and 2-methyimidazole. The asobtained 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.
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