INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Essential Work of Fracture of Photo-oxidized LDPE/EVA blends
Autor/es:
L. FASCE; G. CHIAVERANO; R. LACH; P. FRONTINI
Revista:
MACROMOLECULAR SYMPOSIA
Editorial:
Wiley InterScience
Referencias:
Año: 2006 vol. 247 p. 271 - 281
ISSN:
1022-1360
Resumen:
The Essential Work of Fracture approach (EWF) was used to determine how
UV-C irradiation alters the fracture behaviour of LDPE/EVA films. Complementary
characterization was performed by FTIR, DSC, TOM, and uniaxial tensile testing. The
crosslinking reactions that govern photo-oxidation process at initial stage of
exposure stiffened the amorphous phase of the polymer, leading to films with
enhanced elastic modulus, yield stress and ultimate strength, but impaired strain at
break. In the fracture experiments carried out on films irradiated within 0 and 5 days,
EWF methodology requirements were met and the corresponding fracture toughness
parameters (we and bwp ) turned out to be sensitive to UV-C irradiation. Longer
irradiation time triggered the development of microcracks, which not allowed further
stable crack growth and invalidated the application of EWF approach.we and bwp ) turned out to be sensitive to UV-C irradiation. Longer
irradiation time triggered the development of microcracks, which not allowed further
stable crack growth and invalidated the application of EWF approach.