Relationship between Dynamic Mechanical Properties and Water Absorption of Naval Composites.

VERA ALVAREZ; ORLANDO DE LA OSA; ANALÍA VÁZQUEZ

París, Francia

Congreso; SAMPE EUROPE 28th International Conference and Forums in cooperation with The JEC Composites show; 2007

The effect water on mechanical and dynamical-mechanical properties ofunsaturated polyester, vinyl-ester and epoxy resins/glass fibers composites wasinvestigated. Studies were carried out at several temperatures. The behaviordepends on the difference between the glass transition temperature and the bathtemperature. The diffusion coefficient increased with the temperature. Mechanicalproperties decreased as a consequence of the poorer fiber/matrix interfacialadhesion (studied by SEM) which also decreased as temperature increased. Theeffect of fibre arrangements was also investigated. For cycling process, the waterabsorbed and the diffusion coefficient were lower in the first cycle because thecracks created in this stage and during drying leads to higher voids content; thiseffect was remarkable for composites and at higher temperatures. Dynamicalmechanicalproperties were modelled.