Polyphosphazene hybridized perovskite copper hydroxystannate microspheres effectively improve the flame retardant and mechanical properties of Poly(vinyl Chloride) Resin

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Abstract
To effectively reduce the fire hazard of flexible polyvinyl chloride (PVC), this study explored the synthesis of perovskite‐type copper hydroxystannate (CuSn(OH) 6 ) microspheres by co‐precipitation method. Then an organic–inorganic hybrid microsphere (CuSn(OH) 6 @PZS) with core‐shell structure was fabricated by in situ coating with poly(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphenol) (PZS). The results showed that CuSn(OH) 6 @PZS performs most significantly in reducing the total heat release, while the CuSn(OH) 6 alone achieves the best smoke suppression effect. The limiting oxygen index (LOI) value of the PVC composites is improved from 29.0% to a maximum of 35.3%. During combustion, the peak heat release rate (PHRR) and total smoke production (TSP) decrease by a maximum of 50.8% and 44.9%, respectively. Significantly, the presence of the PZS coating also improves the interfacial compatibility with PVC. The mechanical properties were significantly improved and the elongation at break improving by 40.9%.
Funding Information
  • National Natural Science Foundation of China (52173073)

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