In situ growth of nano-MOFs on ammonium polyphosphate particles for boosting flame retardancy, smoke suppression and mechanical properties of epoxy

• Published in: Journal of materials science 2022-11, Vol.57 (42), p.20082-20094
• Main Authors: Yue, Zhenqing, Lin, Jian, Yang, Dangsha, Zhu, Yanyan, Li, Jiangen, Zhou, Jingheng, Wang, Xinlong
• Format: Article
• Language: English
• Subjects: Biopolymers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Composite materials; Crystallography and Scattering Methods; Enthalpy; Epoxy resins; Fireproofing agents; Flame retardants; Heat; Heat release rate; Materials Science; Mechanical properties; Nitrates; Nitrogen; Polymer Sciences; Polymers; Polymers & Biopolymers; Smoke; Solid Mechanics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-07880-8

ZIF-8@APP was prepared by in situ growth of ZIF-8 on the surface of ammonium polyphosphate (APP) through co-precipitation method. The ZIF-8@APP/EP composites were prepared by adding ZIF-8@APP into epoxy resin (EP). The composites with loading of ZIF-8@APP showed good flame retardancy, smoke suppression and mechanical properties simultaneously. The limiting oxygen index (LOI) of the flame retarded composites containing 10 wt% of ZIF-8@APP was 32.6% and the UL-94 test reached V-0. Meanwhile, the peak heat release rate and total heat release of the composites with 5 wt% of ZIF-8@APP were reduced by 60.8 and 35.5% compared with pristine epoxy resin. The ZIF-8 particles on APP improved interface actions between APP and EP matrix, which led to the enhancement in mechanical properties of the flame-retardant composites. Graphical abstract