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Journal of Fire Sciences, Vol. 26, No. 2, 93-108 (2008)
DOI: 10.1177/0734904107083863

Combustion and Thermal Behavior of Polyurethane Acrylate Modified with a Phosphorus Monomer

Xilei Chen

State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, P R China

Yuan Hu

State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, P R China, yuanhu{at}ustc.edu.cn

Lei Song

State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, P R China

Weiyi Xing

State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, P R China

A series of UV curable flame retardant resins were obtained by blending bis(2-acryloxyethyl) 2.6.7-trioxa-1-phosphabicyclo[2.2.2.]octane-4-methylol-1-oxide phosphate (MDMPE) in certain ratios with a commercial polyurethane acrylate (PUA). It has been found that the cured film shows good flame retardancy when the MDMPE is at 30% additive level. The cone calorimeter results show that the heat release rate decreases in comparison with the pure PUA. The thermogravimetric analysis (TGA) and real time Fourier-transform infrared spectroscopy measurements (RTFTIR) results show that the phosphate group in MDMPE first degrades to form poly(phosphoric acid) before the degradation of PUA. Then, the formed poly(phosphoric acid) effectively promotes the conversion of PUA to form char, which prevents the sample from further burning. It can be concluded that MDMPE could catalyze the degradation of PUA to form char residue, and could be used as a UV curable flame retardant which acts by a condensed phase mechanism.

Key Words: flame retardant • UV curable • polyurethane acrylate • combustion.


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