writer：Liu Y, Fang ZP*
keywords：Intumescent flame retardant; Montmorillonite; Flame retardancy; Synergism; ethylene-vinyl acetate copolymer
source：期刊
specific source：J. Polym. Eng., 2015, 35(5): 443-449
Issue time：2015年
Different flame retardant ethylene-vinyl acetate copolymer (EVA) formulations were prepared to evaluate the synergistic effect between organo-montmorillonite (OMMT) and a Schiff-base polyphosphate ester (PAB) on the combustion behavior of EVA. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that montmorillonite platelets selectively dispersed in the PAB phase. EVA/PAB/OMMT(80/15/5) had better thermal stability and flame retardancy than EVA/PAB(80/20), as indicated by the results of thermogravimetric analysis (TGA), limited oxygen index (LOI), vertical burning test (UL-94) and microscale combustion colorimeter (MCC), showing a synergism between OMMT and PAB. For example, the onset decomposition temperature (T5%) increased from 233?C to 296?C, the char residue at 600?C increased from 6.6% to 11.0%, and the peak heat release rate (PHRR) decreased from 718.1W/g to 706.6W/g. This is caused by the silicoaluminophosphate (SAPO) structure formed by reactions between the phosphoric acid generated from PAB and OMMT.