INVESTIGADORES
BERNAL Celina Raquel
artículos
Título:
Mechanical and fracture behavior of PP/EVOH/Na blends
Autor/es:
M. MONTOYA, M.J. ABAD, L. BARRAL LOSADA AND C. BERNAL
Revista:
EUROPEAN POLYMER JOURNAL
Editorial:
Elsevier
Referencias:
Año: 2006 vol. 42 p. 265 - 273
ISSN:
0014-3057
Resumen:
In this work the deformation and fracture behavior of PP/EVOH blends compatibilized with ionomer Na+ at room
and low temperature was studied. Uniaxial tensile tests on dumb-bell samples and fracture tests on single-edge notched
bending (SENB) specimens were performed for 10 wt.% and 20 wt.% EVOH blends with different ionomer content at
23 C and 20 C. The incorporation of EVOH to PP led to less ductile materials in tension as judged by the lower
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
and low temperature was studied. Uniaxial tensile tests on dumb-bell samples and fracture tests on single-edge notched
bending (SENB) specimens were performed for 10 wt.% and 20 wt.% EVOH blends with different ionomer content at
23 C and 20 C. The incorporation of EVOH to PP led to less ductile materials in tension as judged by the lower
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
+ at room
and low temperature was studied. Uniaxial tensile tests on dumb-bell samples and fracture tests on single-edge notched
bending (SENB) specimens were performed for 10 wt.% and 20 wt.% EVOH blends with different ionomer content at
23 C and 20 C. The incorporation of EVOH to PP led to less ductile materials in tension as judged by the lower
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
C and 20 C. The incorporation of EVOH to PP led to less ductile materials in tension as judged by the lower
values of the ultimate tensile strain displayed by all PP/EVOH blends in comparison to neat PP. In contrast, the ionomer
Na+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
+ addition partially counteracted this effect. The compatibilizing effect of ionomer Na+ was also evident in fracture
results since higher values of the fracture parameter were obtained for the ternary blends. SEM observations also
confirmed this effect. On the other hand, PP/EVOH blends exhibited different fracture behavior with test temperature.
All blends showed pseudo stable behavior at room temperature characterized by apparently stable crack growth that
could not be externally controlled. On the contrary, blends behaved as semi-brittle at 20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.
20 C with some amount of stable
crack growth preceding unstable brittle fracture. Finally, irrespectively of the temperature or the ionomer content all
PP/EVOH blends exhibited more ductile fracture behavior with a higher tendency to stable crack propagation than neat
polypropylene.