Air‐Stable Polyphosphazene‐Functionalized Few‐Layer Black Phosphorene for Flame Retardancy of Epoxy Resins,Small

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Air‐Stable Polyphosphazene‐Functionalized Few‐Layer Black Phosphorene for Flame Retardancy of Epoxy Resins
Small ( IF 13.0 ) Pub Date : 2019-02-04 , DOI: 10.1002/smll.201805175
Shuilai Qiu _{1,

2} , Yifan Zhou ₁ , Xia Zhou ₁ , Tao Zhang ₁ , Chenyu Wang ₁ , Richard K. K. Yuen ₂ , Weizhao Hu ₁ , Yuan Hu ₁

Affiliation

Similar to graphene, few‐layer black phosphorus (BP) features thermal stability, mechanical properties, and characteristic dimension effects, which has potential as a new member of nanofillers for fabricating polymer nanocomposites. Herein, a cross‐linked polyphosphazene‐functionalized BP (BP‐PZN) is developed with abundant –NH₂ groups via a one‐pot polycondensation of 4,4′‐diaminodiphenyl ether and hexachlorocyclotriphosphazene on the surface of BP nanosheets. Whereafter, the resulting BP‐PZN is incorporated into epoxy resin (EP) to study the flame‐retardant property and smoke suppression performance. Cone results show that the introduction of 2 wt% BP‐PZN distinctly improves the flame‐retardant property of EP, for instance, 59.4% decrease in peak heat release rate and 63.6% reduction in total heat release. The diffusion of pyrolysis products from EP during combustion is obviously suppressed after incorporating the BP‐PZN nanosheets. Meanwhile, the EP/BP‐PZN nanocomposites exhibit air stability after exposure to ambient conditions for four months. The air stability of the BP nanosheets in EP matrix is assigned to surface wrapping by PZN and embedded in the polymer matrix as dual protection. As a new member of the 2D nanomaterials, BP nanosheets have potential to be a new choice for fabricating high‐performance nanocomposites.

中文翻译：

空气稳定的聚磷腈功能化的几层黑色磷光体，可用于环氧树脂的阻燃

与石墨烯相似，很少层的黑磷（BP）具有热稳定性，机械性能和特征尺寸效应的特点，具有作为制造聚合物纳米复合材料的纳米填料的新成员的潜力。本文中，开发了一种交联的聚磷腈官能化的BP（BP-PZN），其中含有丰富的–NH ₂通过BP纳米片表面上的4,4'-二氨基二苯醚和六氯环三磷腈的一锅缩聚反应形成基团。之后，将所得的BP-PZN掺入环氧树脂（EP）中，以研究其阻燃性能和抑烟性能。圆锥结果表明，引入2 wt％的BP-PZN可以显着提高EP的阻燃性，例如，峰值放热速率降低59.4％，总放热降低63.6％。掺入BP-PZN纳米片后，燃烧过程中EP的热解产物的扩散得到明显抑制。同时，EP / BP-PZN纳米复合材料在暴露于环境四个月后显示出空气稳定性。EP基质中的BP纳米片的空气稳定性通过PZN分配给表面包裹，并作为双重保护嵌入聚合物基质中。作为2D纳米材料的新成员，BP纳米片有潜力成为制造高性能纳米复合材料的新选择。

更新日期：2019-02-04

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