INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Nanoindentation, nanoscratch and fragmentation tests applied to PVC films with organic-inorganic coatings.
Autor/es:
LAURA FASCE; VALERIA PETTARIN; CLAUDIA MARANO; MARTA RINK; PATRICIA FRONTINI
Lugar:
Les Diablerets, Switzerland
Reunión:
Conferencia; 5th International Conference on Fracture of Polymers, Composites and Adhesives; 2008
Institución organizadora:
European Structural Integrity Society - Technical Committee 4
Resumen:
Hybrid organic-inorganic coatings find applications in different fields such as optics, microelectronics, packaging and biomedical. For these applications, the mechanical properties of the coating and the adhesion between coating and substrate have to be known because they play a crucial role in coating efficiency. This work is concerned with systems consisting of an organic/inorganic coating applied on a PVC substrate. Two parameters were varied in system’s preparation: the thickness of the coating (0.4 and 1 mm) and the condition of coating’s curing (24, 50 and 168 h at 60°C). The systems were studied and different parameters were estimated combining tensile (elastic modulus of the coating Ec), fragmentation (coating’s strength smax, and interfacial shear strength t), nano-indentation (reduced nanoindentation modulus Er) and nano-scratch tests (critical load Pc). Ec was independent of coating’s thickness and curing conditions. smax was not affected by the curing time while was higher if the coating’s thickness was lower, due to a lower volume concentration of the defects in the material. t was not affected by the coating thickness but increased with curing time Er decreased with the ratio between the penetration depth and the coating thickness, hc/t, tending to asymptotically to the reduced modulus of the PVC substrate. No effect of the coating’s curing conditions on Er was again observed. Pc was determined in coincidence with an abrupt change in the load-displacement curve eventually indicating the failure or detachment of the coating. Pc, which can be used as a qualitative measure of the coating substrate adhesion, increased with curing time. Experimental work and data analysis are still in progress for the interpretation of the results in light of the models proposed in literature for similar systems.