Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
In studying the fire behavior of composites it is quite important to take into account two different aspects of the problem: reaction to fire, in which material flammability (exclusively in the gas phase) and also combustibility (in the gas and solid phases) are issues; and smoke emission from the material subjected to overheating, in which smoke density and toxicity are major concerns. Improvements in fire properties can be achieved using fire retardants and smoke suppressants. Fire retardants can act chemically, by interfering in the radical chain reactions that take place in combustion processes, or physically, by forming a protective layer, either by giving off non-flammable gases (H sub 2 O, HCl, HBr, etc.) to dilute flammable ones and exclude oxygen from the fire area in the gas phase, or by promoting endothermic reactions or surface dehydration. Smoke suppressants such as zinc compounds can also act both physically and chemically, by formation of metal halides and oxyhalides in redox reactions in the condensed and gas phases. The present work focuses on a study of composite consisting of halogenated polyester resins reinforced with glass fibers. These materials were processed by hand layup at room temperature, followed by post-curing in an oven at 80 deg C for 2 h. The main objective was an exhaustive analysis of the possible effects on fire suppression and mechanical properties, due to the presence of different additives and fillers. This study was carried out using an experimental design aimed at statistical analysis of the results. The scope of the work is focused on a further optimisation of this type of material, in order to obtain a wide range of suitable formulations depending on the performance required. (Additives: alumina trihydrate, dimethylmethyl phosphonate, zinc borate, and zinc hydroxy stannate.)