ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
5 years ago

Hierarchical Polyphosphazene@Molybdenum Disulfide Hybrid Structure for Enhancing the Flame Retardancy and Mechanical Property of Epoxy Resins

Hierarchical Polyphosphazene@Molybdenum Disulfide Hybrid Structure for Enhancing the Flame Retardancy and Mechanical Property of Epoxy Resins
Xia Zhou, Shuilai Qiu, Weiyi Xing, Chandra Sekhar Reddy Gangireddy, Yuan Hu, Zhou Gui
A novel polyphosphazene (PZS) microsphere@molybdenum disulfide nanoflower (MoS2) hierarchical hybrid architecture was first synthesized and applied for enhancing the mechanical performance and flame retardancy of epoxy (EP) resin via a cooperative effect. Herein, using PZS microsphere as the template, a layer of MoS2 nanoflowers were anchored to PZS spheres via a hydrothermal strategy. The well-designed PZS@MoS2 exhibits excellent fire retardancy and a reinforcing effect. The obtained PZS@MoS2 significantly enhanced the flame-retardant performance of EP composites, which can be proved by thermogravimetric and cone calorimeter results. For instance, the incorporation of 3 wt % PZS@MoS2 brought about a 41.3% maximum reduction in the peak heat-release rate and decreased by 30.3% maximum in the total heat release, accompanying the higher graphitized char layer. With regard to mechanical property, the storage modulus of EP/PZS@MoS23.0 in the glassy state was dramatically increased to 22.4 GPa in comparison with that of pure EP (11.15 GPa). It is sensible to know that the improved flame-retardant performance for EP composites is primarily assigned to a physical barrier effect of the MoS2 nanoflowers and the polyphosphazene structure has an positive impact on promoting char formation in the condensed phase.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b08878

DOI: 10.1021/acsami.7b08878

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