期刊
EUROPEAN POLYMER JOURNAL
卷 44, 期 3, 页码 704-715出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2008.01.017
关键词
decomposition; DOPO; flame retardancy; composites; thermosets
amino groups directly on the DOPO framework, is investigated with respect to its use as a reactive flame retardant in thermosets. A mechanism for decomposition of the corresponding phosphorus-modified epoxy resin system based on a diglycidylether of bisphenol A DGEBA and 2 (DGEBA/2) is proposed and compared to the systems using DGEBA and 4,4'-diaminodiphenylsulfon (DGEBA/DDS) and to a similar system based on the structurally comparable non-reactive DOPO-based compound (DGEBA/DDS/1). Additive I changed the decomposition characteristics of the epoxy resin only slightly and phosphorus was released. Incorporating 2 induces two-step decomposition and most of the phosphorus remains in the residue. Furthermore, the fire behaviour of neat epoxy resin systems and a representative carbon fibre-reinforced composite based on DGEBA, DDS and 2 (DGEBA/DDS/2) were examined and compared to that of the analogous composite systems based on DGEBA/DDS and DGEBA/DDS/1. Based on different flame retardancy mechanisms both the reactive compound 2 and the additive compound I improve flammability (increase in LOI >13% and achieving V-I behaviour) of the epoxy resin and composites. Under forced flaming only the flame inhibition of the additive compound I acts sufficiently. Lastly, the superior key mechanical properties of the epoxy resin and composite based on 2 are sketched. (C) 2008 Elsevier Ltd. All rights reserved.
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