期刊
COMPOSITES PART B-ENGINEERING
卷 238, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.109886
关键词
Flame-retardant; Mechanical properties; Black phosphorus; Epoxy resin
资金
- Natural Science Foundation of Anhui Province [2008085QE211]
- National Natural Science Foundation of China [51991352, 21975239]
- Postdoctoral Innova-tive Talents Support Program [BX20190316]
- China Postdoctoral Science Foundation [2020M671905]
A novel multifunctional nano flame retardant BP-DPBA@Co-BO was successfully synthesized by grafting phenylboronic acid on the surface of few-layer BP nanosheets and anchoring amorphous cobalt-based borate on the surface through a low temperature reduction reaction, which greatly improved the flame retardancy and mechanical properties of epoxy resin composites.
The weak anti-oxidation and smoke-suppression abilities limit the use of black phosphorus (BP) in the preparation of high-performance flame-retardant epoxy resin (EP) composites. Here, aromatic diazonium chemistry was used to graft phenylboronic acid on the surface of few-layer BP nanosheets (BPNSs) to obtain passivated BP based nanomaterials (BP-DPBA). Then, a novel multifunctional nano flame retardant BP-DPBA@Co-BO was obtained by anchoring amorphous cobalt-based borate (Co-BO) on the surface of BP-DPBA through a low temperature reduction reaction. Subsequently, BP-DPBA@Co-BO was incorporated into EP matrix in the form of nanofillers and formed a mechanically enhanced system. As expected, EP nanocomposites containing 2 wt% BP-DPBA@Co-BO achieves greatly improvements in thermal stability and fire safety, with 93% increase in char yield (CY) during pyrolysis, 48.4% and 41.7% decrease in peak heat release rate (PHRR) and total heat release (THR) during combustion respectively, a limiting oxygen index (LOI) value up to 32.5% and a UL94 rating of V0. In addition, the presence of Co-BO greatly improves the ability of BP to suppress toxic smoke. Specifically, EP/ BP-DPBA@Co-BO 2.0 achieves a 25.4% reduction in total smoke production (TSP) during combustion. In particular, the maximum 36.2% and 73.2% increases are achieved in storage modulus and impact strength, respectively, confirming that BP-DPBA@Co-BO can effectively enhance the mechanical properties of EP. Therefore, this work provides a feasible solution for loading high-valence metal compounds on the surface of BPNSs, and prepared high-performance EP nanocomposites with enhanced fire safety and mechanical properties.
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