INVESTIGADORES
FRONTINI patricia Maria
artículos
Título:
The effect of annealing temperature on the fracture performance of isotactic polypropylene
Autor/es:
A. FAVE; P. M. FRONTINI
Revista:
JOURNAL OF MATERIALS SCIENCE
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 1995 p. 2446 - 2454
ISSN:
0022-2461
Resumen:
The influence of annealing temperature on the fracture behaviour of a commercialextrusion-grade isotactic polypropylene was studied. Fracture mechanics analysis wascarried out at room temperature and at a low crosshead speed under J-controlledconditions. Parameters characterizing fracture initiation, J~c, and crack propagation, TM, weredetermined. Some thermal treatments induced "ductile instability" after a certain amount ofcrack extension while others strongly enhanced the fracture toughness parameters andpromoted completely stable behaviour. Aiming to correlate mechanical properties with thesupermolecular structure, the different morphologies induced by thermal treatments werestudied by differential thermal analysis. In addition, a qualitative fracture surface analysiswas carried out by SEM. Craze formation appeared to be the principal plastic deformationmechanism present. The degree of crystallinity and the degree of interconnection related tothe thermal treatment the sample had undergone, are the main structural factors controllingfracture performance.1.
