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Polymers and Polymer Composites

Effect of red phosphorus masterbatch on flame retardancy and thermal stability of polypropylene/thermoplastic polyurethane blends

February 1, 2015 By: Yang Xu; Mengqi Tang; Xiaolang Chen; Man Chen; Jie Yu; Yonghong Ma; Zhidan Sun; Zhibin Zhang; Jun Lv Research article

Title: Effect of red phosphorus masterbatch on flame retardancy and thermal stability of polypropylene/thermoplastic polyurethane blends
Page Range: p.113-120
Author(s): Yang Xu; Mengqi Tang; Xiaolang Chen; Man Chen; Jie Yu; Yonghong Ma; Zhidan Sun; Zhibin Zhang; Jun Lv
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.2

Abstract
In this work, red phosphorus masterbatch (RPM) was filled into polypropylene/thermoplastic polyurethanes (PP/ TPU) blends as a halogen-free flame retardant. The flammability behaviour, thermal stability and mechanical properties were investigated by limit oxygen index (LOI), UL-94 vertical burning, cone calorimeter tests (CCT), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The results showed that the addition of RPM improved the flame retardant performance of PP/TPU blends. The LOI values of the composites with RPM were higher than that of the PP/TPU blends, and the UL-94 V-2 rating was achieved for PP/TPU/RPM composites. The CCT results further indicated that the heat release rates (HRR), total heat release (THR), and the CO2 production rate (CO2P) decreased in comparison with the PP/TPU blends. TGA data indicated that RPM greatly enhanced the thermal stability and char residues of PP/TPU blends. The addition of RPM deteriorated the tensile strength of the PP/TPU/RPM composites. However, the impact strength of the composites was improved. 24 Refs.

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