A Novel Organophosphorus Hybrid with Excellent Thermal Stability: Core–Shell Structure, Hybridization Mechanism, and Application in Flame Retarding Semi-Aromatic Polyamide

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• 作者：Xue-Bao Lin ; Shuang-Lan Du ; Jia-Wei Long ; Li Chen ; Yu-Zhong Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：8
• 期：1
• 页码：881-890
• 全文大小：683K
• ISSN：1944-8252

文摘

An organophosphorous hybrid (BM@Al-PPi) with unique core–shell structure was prepared through hybridization reaction between boehmite (BM) as the inorganic substrate and phenylphosphinic acid (PPiA) as the organic modifier. Fourier transform infrared spectra (FTIR), solid state ³¹P and ²⁷Al magic angle spinning nuclear magnetic resonance, X–ray diffraction, and element analysis were used to investigate the chemical structure of the hybrids, where the microrod–like core was confirmed as Al-PPi aggregates generated from the reaction between BM and PPiA, and those irregular nanoparticles in the shell belonged to residual BM. Compared with the traditional dissolution–precipitation process, a novel analogous suspension reaction mode was proposed to explain the hybridization process and the resulting product. Scanning electronic microscopy further proved the core–shell structure of the hybrids. BM exhibited much higher initial decomposition temperature than that of Al-PPi; therefore, the hybrid showed better thermal stability than Al-PPi, and it met the processing temperature of semi–aromatic polyamide (HTN, for instance) as an additive-type flame retardant. Limiting oxygen index and cone calorimetric analysis suggested the excellent flame-retardant performance and smoke suppressing activity by adding the resulting hybrid into HTN.