Preparation and flammability of a novel intumescent flame-retardant poly(ethylene-co-vinyl acetate) system |
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Authors: | De-Yi Wang Ming-Hai Qu Jun-Sheng Wang |
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Institution: | a Center for Degradable and Flame-Retardant Polymeric Materials, Key Laboratory of Green Chemistry and Technology (MoE), College of Chemistry, Sichuan University,Chengdu 610064, China b Department of Textile Engineering, Dezhou University, Dezhou 253015, China c State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610064, China |
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Abstract: | A phosphorus-containing flame retardant, 4-(5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinan-2-yloxymethyl)-2,6,7-trioxa-1-phospha-bicyclo2.2.2]octane-1-oxide (MOPO), was synthesized successfully and characterized. The flame retardancy and thermal behavior of a new intumescent flame-retardant (IFR) system for EVA, which was made of MOPO and ammonium polyphosphate (APP), were investigated by limiting oxygen index (LOI) test, vertical burning test (UL-94), cone calorimeter, and thermogravimetric analysis (TGA). An LOI value of 28.4 and UL-94 V-0 rating can be achieved when the total loading of MOPO and APP was 30 wt.%. The results from cone calorimeter indicate that both the heat release rate (HRR) and the total heat release (THR) of IFR-EVA decreased significantly compared with those of neat EVA. TG curves showed that the amount of residues increased significantly when intumescent additives were added; it also could be found that the LOI values increased with the increase in char residues. Meanwhile, morphology of the residues obtained from burning IFR-EVA in LOI test was studied through the SEM observations and rich compact char layers could explain the excellent flame retardance. |
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Keywords: | Flame retardance Intumescence Cone calorimeter Poly(ethylene-co-vinyl acetate) |
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