Thermal degradation behavior and flame retardant properties of PET/DiDOPO conjugated flame retardant composites

Yushu Xiang; Yun Gao; Guomin Xu; Min He; Shuhao Qin; Jie Yu

doi:10.3389/fchem.2022.1018998

Thermal degradation behavior and flame retardant properties of PET/DiDOPO conjugated flame retardant composites

Front Chem. 2022 Oct 7:10:1018998. doi: 10.3389/fchem.2022.1018998. eCollection 2022.

Authors

Yushu Xiang^{1

2}, Yun Gao^{1

2}, Guomin Xu^{1

2}, Min He^{1

2}, Shuhao Qin^{1

2}, Jie Yu^{1

2}

Affiliations

¹ College of Materials and Metallurgy, Guizhou University, Guiyang, China.
² National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, China.

Abstract

PET/DIDOPO conjugated flame retardant composites were prepared by melt blending of styrene bridged DOPO (DIDOPO) into polyethylene terephthalate (PET). The flame retardancy, rheological behavior, and thermal degradation behavior of the composite were characterized by vertical combustion test (UL-94), limit oxygen index test (LOI), rotational rheometer, and thermogravimetry (TG). The results showed that the flame retardant composite with V-0 grade was obtained when the amount of DIDOPO is 12.5wt%, and the corresponding LOI value was 56.87% higher than that of PET. The thermogravimetry-fourier infrared spectroscopy (TG-FTIR) test results showed that DIDOPO could promote the degradation of PET/DIDOPO materials, and release phosphorus-containing free radicals to quench the flame, therefore slowing down the combustion process, and mainly playing the key flame retardant role in gas-phase.

Keywords: DOPO derivative; PET; flame retardant; rheological behavior; thermal degradation behavior.