Facile modification of aluminum hypophosphate and its flame retardancy for polystyrene  

作　　者：Wensheng Li Liangyuan Qi Daolin Ye Wei Cai Weiyi Xing 

机构地区：[1]State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China [2]Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China [3]Suzhou Key Laboratory of Urban Public Safety,Suzhou Institute for Advanced Study,University of Science and Technology of China,Suzhou 215000,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第8期90-98,共9页中国化学工程学报（英文版）

基　　金：financially supported by the Youth Innovation Promotion Association CAS (2019448);Fundamental Research Funds for the Central Universities (WK2480000007);the Excellent Young Scientist Training Program of USTC (KY2320000018);USTC Tang Scholar, Youth Innovation cross-team fund project of Qinghai Salt Lake Research Institute (LJCTD-2022-3)。

摘　　要：A phosphorus-containing flame retardant, aluminum hypophosphite(AHPi), has been modified by(3-aminopropyl) triethoxysilane(KH550) to prepare flame-retardant polystyrene(PS). The influence of modified AHPi on the morphology and characterization was investigated, and differences in flame retardant properties of the PS/AHPi and PS/modified AHPi were compared. The PS composite can pass the vertical burning tests(UL-94 standard) with a V-0 rating when the mass content of modified AHPi reaches20%, compared with the mass content of 25% AHPi. The element mapping of the PS composite shows that modified AHPi has better dispersion in PS than AHPi. Thermogravimetric analysis results indicated that adding modified AHPi can advance the initial decomposition temperature of the composite material.With the addition of modified AHPi, the decrease in peak heat release rate(p HRR) is more evident than AHPi, and the char yield of the resultant PS composites gradually increased. With the addition of 25%modified AHPi, the p HRR and total heat release of PS composites decreased by 81.4% and 37.6%. The modification of AHPi promoted its dispersion in the PS matrix and improved the char formation of PS composites. The results of real-time infrared spectrometry of PS composites, Fourier transform infrared spectra and X-ray photoelectron analysis of the char layer indicated that modified AHPi has flame retardancy in condensed and gas phases.

关 键 词：NANOMATERIALS Safety Thermodynamic properties Aluminum hypophosphite Char formation mechanism 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]