L. Wang, W. Yang, B. B. Wang, Y. Wu, Y. Hu, L. Song and R. K. K. Yuen (2012) The Impact of Metal Oxides on the Combustion Behavior of Ethylene-Vinyl Acetate Coploymers Containing an Intumenscent Flame Retardant. Journal/Industrial &, Engineering Chemistry Research 51 7884-7890. [In English]
Web link: http://dx.doi.org/10.1021/ie202502s
Keywords: LANTHANUM OXIDE, FIRE RETARDANCY, PARTICLE-SIZE, INTUMESCENT, COMPOSITES, SYSTEM, FORMULATIONS, COPOLYMER, FILLERS, BLENDS
Abstract: The objective of this work was to compare the flame retardancy of intumescent flame retardant ethylene vinyl acetate (EVA/IFR) composites containing different metal oxides including lanthanide oxide, iron oxide, the mixture of iron oxide and lanthanide oxide, and lanthanum ferrite nanocrystalline (LaFeO3). A novel compound containing iron and lanthanum, LaFeO3 was successfully prepared. The EVA/IFR composites with these different coadditives were then fabricated through a melt blending process. Thermogravimetric analysis data showed that these different coadditives could increase the char residue formation. Cone calorimeter results revealed that these different coadditives and IFR could clearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as heat release rate, total heat release, average mass loss rate, average smoke extinction area, and so on. Moreover, significant improvements were obtained in limited oxygen index and Underwriters Laboratories 94 ratings. Among all of the samples, the fire risk of EVA/IFR/LaFeO3 system was the lowest. The residue characterization demonstrated that LaFeO3 could promote the formation of the homogeneous and compact intumescent char layer.

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