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5955485 
Journal Article 
Combustion Behavior and Thermal Oxidative Degradation of EVA Containing Intumescent Flame Retardant 
Wu, Kun; Shen, M; Hu, Y 
2010 
1 
Polymer - Plastics Technology and Engineering
ISSN: 0360-2559
EISSN: 1525-6111 
49 
15 
1527-1533 
WOS:000285059900005 
Microencapsulated ammonium polyphosphate (VAPP) with poly(vinyl alcohol)-melamine-formaldehyde (VMF) shell was introduced in ethylene vinyl acetate copolymer (EVA) to improve its flame retardancy. Due to the presence of VMF shell, VAPP shows better compatibility, flame retardancy and water resistance compared with ammonium polyphosphate (APP) in EVA. The flammability of EVA and its flame-retarded composites was studied by LOI, UL-94 and cone calorimeter. The composite containing 40wt% VAPP can pass V-0 in UL-94 test, and hot water treatment shows few effects on its LOI value and UL-94 rating. The cone results indicated that the use of VAPP in EVA can significantly decrease heat release rate and total heat release compared with APP. To understand the mechanism of action of VAPP, dynamic FTIR experiments were carried out on EVA and EVA/VAPP composites. Based on above studies, the flame retardant mechanism of VAPP in EVA composite is discussed. © Taylor & Francis Group, LLC. 
Ammonium polyphosphate; EVA; Intumescent flame retardant; Microencapsulation; Thermal oxidative degradation