Effect of the Phosphorus鈥揘itrogen-Containing Quaternary Ammonium Salt Structure on the Flammability Properties of Poly(methyl methacrylate)/Montmorillonite Nanocomposites

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• 作者：Guobo Huang ; Haichang Guo ; Jianguo Yang ; Xu Wang ; Jianrong Gao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 20, 2013
• 年：2013
• 卷：52
• 期：11
• 页码：4089-4097
• 全文大小：491K
• 年卷期：v.52,no.11(March 20, 2013)
• ISSN：1520-5045

文摘

A series of phosphorus鈥搉itrogen-containing quaternary ammonium salts (PNQASs) were designed and synthesized for use as clay modification reagents to investigate the impact of their chemical structure on the morphology and flammability properties of nanocomposites obtained by in situ polymerization. The composition, chain length, and polarity of PNQASs are closely related to the formation of nanocomposites and thus affect the flame retardancy of the materials. The dispersion of montmorillonite (MMT) modified by a PNQAS (PNQAS鈥揗MT) in a poly(methyl methacrylate) matrix was identified by using wide-angle X-ray scattering (WAXS) and transmission electron microscopy (TEM). The WAXS and TEM results showed well-dispersed systems obtained by introducing a phosphorus鈥搉itrogen group into the PNQAS or increasing the chain length of the PNQAS. Thermogravimetic analysis and cone calorimeter experiments showed that the thermal stability and flammability properties were improved for the PMMA/PNQAS鈥揗MT systems, particularly for the well-dispersed clay modified with high phosphorus and nitrogen content PNQAS composites. This understanding should lead to better design of clay modifications for use in flame-retardant polymer nanocomposites.