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Structure-Property Relationships of Novel, Flame-Retarded Prepreg Resins for Applications in Aircraft Interiors

Nowadays, aircraft interior parts like sidewalls, ceilings and hatracks are sandwich structures consisting of a honeycomb core and prepreg face sheets on both sides of the core. The thermosetting prepregs currently used in this application are mainly based on phenolic matrices because of their low material cost and their inherent flame resistance. But these resins also possess major disadvantages such as high shrinkage and elusion of volatiles during curing, as the curing mechanism of the phenolic resins is based on a condensation reaction. Accordingly, the finished parts exhibit low surface quality and need high effort for reworking their surfaces, which tremendously rises manufacturing costs. Consequently, the demand for novel resin systems for use in aircraft interiors, which enable curing in a non-condensation reaction has risen.

Therefore, the aim of the thesis is to evolve the required scientific and technical fundamentals for the formulation of novel epoxy-based prepreg resin systems for use in aircraft interiors. Major effort has to be taken to achieve curing of the resin systems in a non-condensation reaction at temperatures below 160 °C within maximum 60 minutes and to fulfil the fire safety requirements necessary for use in the intended application. Thus, this work focuses on solutions to realize the desired curing cycles and to render the epoxy resins flame retardant by use of halogen free modifiers.

Finally, prepregs based on the optimized resin systems are produced in order to evaluate the properties of relevant sandwich structures. Using these prepregs the processability of the new matrix resin in manual and automated manufacturing processes can be proven. Fire testing on sandwich structures reveals that the relevant characteristics to meet fire safety requirements for aircraft interiors can be fulfilled.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Thomas Neumeyer

Thomas Neumeyer
Lehrstuhl für Polymere Werkstoffe
Universität Bayreuth

Information

Free keywords: fibre reinforced composites, epoxy resins, prepreg, flame retardancy, mechanical properties, curing kinetics, aviation
Institute / chair: Fakutät für Ingenieurwissenschaften der Universität Bayreuth
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr. rer. nat. Manfred Döring
Publication year: 2015
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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