Thermal degradation behavior of hyperbranched polyphosphate acrylate/tri(acryloyloxyethyl) phosphate as an intumescent flame retardant system |
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Authors: | Zhanguang Huang |
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Institution: | State Key Laboratory of Fire Science and Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China |
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Abstract: | The hyperbranched polyphosphate acrylate (HPPA) was blended in different ratios with tri(acryloyloxyethyl) phosphate (TAEP) to obtain a series of UV curable intumescent flame retardant resins. The thermal degradation mechanism of their cured films in air was studied by thermogravimetric analysis and in situ Fourier-transform infrared spectroscopy. The results showed that the addition of HPPA reduced the initial decomposition temperature (Tdi) but increased the char residue. Moreover, the decomposition was considered to be divided into three stages: firstly the degradation of phosphate group, secondly ester group and finally alkyl chain. The morphological structure of the formed char was observed by scanning electron microscopy, demonstrating the formation mechanism of the intumescent charred crust. |
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Keywords: | Flame retardance Hyperbranched Phosphate Intumescence UV curing |
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