Journal
JOURNAL OF POLYMER ENGINEERING
Volume 35, Issue 5, Pages 443-449Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/polyeng-2014-0291
Keywords
ethylene-vinyl acetate copolymer (EVA); flame retardancy; intumescent flame retardant; montmorillonite; synergism
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Funding
- National Basic Research Program of China [2010CB631105]
- Doctoral Program Foundation of East China Institute of Technology [DHBK2013210]
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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 (T-5%) increased from 233 degrees C to 296 degrees C, the char residue at 600 degrees C increased from 6.6% to 11.0%, and the peak heat release rate (PHRR) decreased from 718.1 W/g to 706.6 W/g. This is caused by the silicoaluminophosphate (SAPO) structure formed by reactions between the phosphoric acid generated from PAB and OMMT.
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