Abstract
The influence of annealing temperature on the fracture behaviour of a commercial extrusion-grade isotactic polypropylene was studied. Fracture mechanics analysis was carried out at room temperature and at a low crosshead speed underJ-controlled conditions. Parameters characterizing fracture initiation,J IC, and crack propagation,T M, were determined. Some thermal treatments induced “ductile instability” after a certain amount of crack extension while others strongly enhanced the fracture toughness parameters and promoted completely stable behaviour. Aiming to correlate mechanical properties with the supermolecular structure, the different morphologies induced by thermal treatments were studied by differential thermal analysis. In addition, a qualitative fracture surface analysis was carried out by SEM. Craze formation appeared to be the principal plastic deformation mechanism present. The degree of crystallinity and the degree of interconnection related to the thermal treatment the sample had undergone, are the main structural factors controlling fracture performance.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
J. Runt andM. Jacq,J. Mater. Sci. 24 (1989) 1421.
R. Greco andG. Ragosta,ibid. 23 (1988) 4171.
M. R. Braga, M. Rink andA. Pavan,Polymer 32 (1991) 3152.
A. O. Baranov andE. V. Prut,J. Appl. Polym. Sci. 44 (1992) 1557.
M. A. Kay,Br. Polym. J. 21 (1989) 285.
J. I. Ito, K. Mitani andY. Mizutani,Jpn Appl. Phys. Soc. 46 (1992) 1221.
Y. L. Huang andN. B. Nito,J. Polym. Sci. B Polym. Phys. 29 (1991) 129.
R. Seguela andF. Rietsch,Polymer 27 (1986) 532.
B. Wunderlich, “Macromolecular Physics” Vol. 3 (Academic Press, New York, 1980) p. 63.
S. Hashemi andJ. G. Williams,Polym. Eng. Sci. 26 (1986) 760.
C. R. Bernal, P. M. Frontini andR. Herrera,Polym. Test. 11 (1992) 271.
J. R. Rice,J. Appl. Mech. 35 (1968) 379.
P. C. Paris, H. Tada, A. Zahoor andH. Ernst, “Elastic Plastic Fracture”, ASTM STP 668 (American Society for Testing and Materials, Philadelphia, PA, (1979) p. 5.
J. Varga,J. Mater. Sci. 27 (1992) 2557.
W. F. Msuya andC. Yue,J. Mater. Sci. Lett. 8 (1989) 1266.
Y. S. Yadav andP. C. Jain,Polymer 27 (1986) 721.
T. Vu-Khanh, B. Sancharuin andB. Fisa,Polym. Compos. 6 (1985) 249.
T. Vu-Khanh andB. Fisa,Theor. Appl. Fract. Mech. 13 (1990) 11.
I. Narisawa,Polym. Eng. Sci. 27 (1987) 41.
S. F. Xavier, J. M. Schutz andK. Friedrich,J. Mater. Sci. 25 (1990) 2411.
J. G. Williams, “Fracture Mechanics of Polymers” (Ellis Horwood, London, 1984) p. 173.
S. Hashemi andJ. G. Williams,J. Mater. Sci. 26 (1991) 621.
I. Narisawa andTakemori,Polym. Eng. Sci. 28 (1988) 1462.
E. Hornbogen andK. Friedrich,J. Mater. Sci. 15 (1980) 2175.
L. H. Lee, J. F. Mandel andF. J. McGarry,Polym. Eng. Sci. 27 (1987) 1128.
D. E. Spahr, K. Friedrich, J. M. Schultz andR. S. Bailey,J. Mater. Sci. 25 (1990) 4427.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Frontini, P.M., Fave, A. The effect of annealing temperature on the fracture performance of isotactic polypropylene. J Mater Sci 30, 2446–2454 (1995). https://doi.org/10.1007/BF01184599
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01184599