Effects of Acidic Sites in HA Zeolite on the Fire Performance of Polystyrene Composite

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• 作者：Mingzhe Dong ; Xiaoyu Gu ; Sheng Zhang ; Hongfei Li ; Peng Jiang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：July 3, 2013
• 年：2013
• 卷：52
• 期：26
• 页码：9145-9154
• 全文大小：635K
• 年卷期：v.52,no.26(July 3, 2013)
• ISSN：1520-5045

文摘

A Lewis acid has been considered as a char promoter during the combustion of polymers. The acidified 4A zeolites (HA zeolite) containing Lewis acid sites (4A-L zeolite) and Br酶nsted-acid sites (4A-H⁺ zeolite) were prepared and their crystallinity and acidic site structure were characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The thermal behavior and flammability of a polystyrene (PS) composite containing different types of zeolite were investigated by thermogravimetric analysis (TGA), volatile gas and condensed phase FTIR analysis, limiting oxygen index (LOI), and cone calorimeter. Both 4A-L and 4A-H⁺ zeolite could enhance the flame retardancy of a PS composite significantly. The heat release rate (HRR) of a PS composite could be decreased by 48% after adding 2% 4A-L. It is suggested that Lewis acidic sites in HA zeolite can alter the degradation route and enhance the char formation of a PS composite.