A high molecular weight, carboxyl functionalisedsolid rubber was added to an epoxy resin-aromaticamino system developed for autoclave curing of honeycombcore composite structures. The achievement of an optimalbalance of viscous flow and viscoelasticity of the resin, bycontrolling the nature and extent of cross-linking of the functionalisedrubber, was proposed as a route to void-free honeycombskins. The aim of the present investigation is tounderstand howthe concentration of carboxylic groups of therubber, prereacted with one of the epoxy monomers, affectsthe matrix resin flow properties. The concentration of carboxylgroups was changed by reacting them with a monofunctionalepoxy resin. Dynamic shear viscosity profiles varyingfrequency, temperature and as function of time during isothermalcure have been determined for blends with differentlyfunctionalised rubbers. Carbon fibre wettability and laminateconsolidation quality have been evaluated, making compositesamples according to conventional prepregging andautoclave curing processes, through electron microscopy offracture surfaces from transverse flexural strength tests.
|Numero di pagine||11|
|Rivista||Macromolecular Chemistry and Physics|
|Stato di pubblicazione||Published - 2005|
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