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首页> 外文期刊>Journal of Applied Polymer Science >Enhancing flame retardance of epoxy resin by incorporation into ammonium polyphosphate/boron nitride nanosheets/zinc ferrite three-dimensional porous aerogel via vacuum-assisted infiltration
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Enhancing flame retardance of epoxy resin by incorporation into ammonium polyphosphate/boron nitride nanosheets/zinc ferrite three-dimensional porous aerogel via vacuum-assisted infiltration

机译：通过真空辅助渗透掺入多磷酸盐/氮化硼氮化物纳米晶片/锌铁素体三维多孔气凝胶中，增强环氧树脂的阻燃性

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摘要

Boron nitride nanosheets (BNNSs) were combined with ammonium polyphosphate (APP) and zinc ferrite (ZF) nanoparticle to prepare APP/BNNS/ZF composite aerogels via a freeze-drying method. Then, epoxy resin (EP) was incorporated into the pores of the as-obtained aerogels via a vacuum-assisted infiltration method to afford APP/BNNS/ZF-EP composites with greatly improved fire resistance. The flame-retardant performance of the as-prepared composites was evaluated by cone calorimetry test; and the flame-retardant mechanism of the aerogels was discussed in relation to thermogravimetric-infrared analysis of the pyrolysis products. Findings demonstrate that the APP/BNNS/ZF-EP composite containing 24.0 wt % of the APP/BNNS/ZF aerogel exhibits superior flame-retardant performance; and its peak heat release rate and total heat release are reduced by 86.2 and 86.5% as compared with those of pristine EP. The reason lies in that APP can be decomposed in the early stage of burning to generate phosphoric acid, thereby promoting the formation of char layer; ZF can catalyze the charring process; and BNNS can act as the physical barrier to retard the burning of EP. In addition, the APP10/BNNS1/ZF0.1-EP composite can be endowed with superhydrophobicity via the modification of polydimethylsiloxane and hydrophobic nanosilica, which could contribute to broadening its scope of application. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48609. Highlights
机译：将氮化硼纳米片（BNNS）与多磷酸铵（APP）和锌铁氧体（ZF）纳米颗粒合并，通过冷冻干燥方法制备APP / BNNS / ZF复合气凝胶。然后，通过真空辅助的渗透方法将环氧树脂（EP）掺入AS获得的气凝胶中，得到应用/ BNNS / ZF-EP复合材料，具有极大地改善的耐火性。通过锥形量热法检测评估了制备的复合材料的阻燃性能;并且讨论了气动凝胶的阻燃机制与热解产物的热重红外分析有关。调查结果表明，含有24.0wt％APP / BNNS / ZF Airgel的APP / BNNS / ZF-EP复合材料表现出优异的阻燃性能;与原始EP相比，其峰值热释放速率和总热释放减少了86.2和86.5％。该应用程序的原因在于燃烧的早期阶段可以分解以产生磷酸，从而促进炭层的形成; ZF可以催化炭化过程;并且BNN可以充当延迟EP燃烧的物理障碍。此外，APP10 / BNNS1 / ZF0.1-EP复合材料可以通过多二甲基硅氧烷和疏水性纳米硅藻的改性来赋予超细侵害，这可能有助于扩大其应用范围。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48609。亮点

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