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

被引：27

作者：

Dong, Mingzhe ^{[1
]}

Gu, Xiaoyu ^{[1
]}

Zhang, Sheng ^{[1
]}

Li, Hongfei ^{[1
]}

Jiang, Peng ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, Minist Educ, Key Lab Carbon Fiber & Funct Polymers, Beijing 100029, Peoples R China

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2013年 / 52卷 / 26期

关键词：

FORMULATIONS; CLAY;

D O I：

10.1021/ie4011222

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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 Bronsted-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.

引用

页码：9145 / 9154

页数：10

共 29 条

[1] 4A zeolite synergistic agent in new flame retardant intumescent formulations of polyethylenic polymers - Study of the effect of the constituent monomers [J].