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Synthesis of tris(phenoxy)trifluorocyclotriphosphazenes and study of its effects on the flammable, thermal, optical, and mechanical properties of bisphenol-A polycarbonate

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Abstract

A flame-retardant tris(phenoxy)trifluorocyclotriphosphazenes, 2,4,6-N3P3(OPh)3F3 (TCTP) containing phenoxyl, fluorine, and cyclotriphosphazene ring was synthesized from hexachlorocyclotriphosphazene and added to polycarbonate (PC) to improve flame retardancy. Its chemical structure was confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance. The synthesis of TCTP was designed to improve the flame retardancy of PC without harming PC excellent optical and mechanical performances. The flame retardancy and thermal degradation behavior of PC/TCTP composites were investigated with the limiting oxygen index (LOI), UL-94 vertical burning test, microscale combustion calorimeter, thermogravimetric analysis, and differential scanning calorimetry. Scanning electron microscopy (SEM) analyses and FTIR spectrophotometer were brought together to study the structure of residual char. The optical and mechanical properties of PC were also taken into consideration at the same time. When 10 % TCTP was incorporated, the LOI of composite achieved the maximum of 40 %, and class V-0 of UL-94 test was passed. The phenomena of SEM and FTIR stated that there was interaction between PC and TCTP to form new stable film in mid of residual char. Light transmittance, tensile, and flexural strength of PC/TCTP systems were improved at different levels.

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Acknowledgements

We would like to thank the generous supports by the following: Dr. Tiannan Zhou; the Experiment Center of Polymer Science and Engineering Academy, Sichuan University; Xinhui Science and Technology co., Ltd; National Natural Science Foundation of China, Grant No. 50973066.

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Authors and Affiliations

  1. The State Key Laboratory of Polymer Materials Engineering, Department of Polymer Science and Materials, Sichuan University, Chengdu, 610065, China

    Yunyun Yang, Weibo Kong, Youchuan Wang & Xufu Cai

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  1. Yunyun Yang
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  2. Weibo Kong
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  4. Xufu Cai
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Correspondence to Xufu Cai.

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Yang, Y., Kong, W., Wang, Y. et al. Synthesis of tris(phenoxy)trifluorocyclotriphosphazenes and study of its effects on the flammable, thermal, optical, and mechanical properties of bisphenol-A polycarbonate. J Therm Anal Calorim 122, 805–816 (2015). https://doi.org/10.1007/s10973-015-4737-3

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  • DOI: https://doi.org/10.1007/s10973-015-4737-3

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