Abstract
Polypropylene (PP) was injection moulded several times to mimic the effect of recycling procedures. The influence of the recycling was studied by following changes in chemical structure, melt viscosity, crystallisation behaviour, and tensile and fracture properties. The main effect of recycling is the lowering of the melt viscosity, which is attributed to molecular weight decrease. Recycled PP exhibits greater crystallisation rate, higher crystallinity and equilibrium melting temperature than those measured for virgin PP. Elastic modulus and yield stress increase with the number of recycling steps. However, elongation at break and fracture toughness decrease.
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REFERENCES
C. D. Papaspyrides and J. G. Poulakis, in “The Polymeric Materials Encyclopedia, ” edited by J. C. Salomone (CRC Press, Inc, 1996) p. 7403.
M. Marrone and F. P. La Mantia, Polymer Recycling 2 (1996) 9.
J. G. Poulakis and C. D. Papaspyrides, Resources, Conservation and Recycling 20 (1997) 31.
V. A. GonzÁlez gonzÁlez, G. Neira-VelÁzquez and J. L. Angulo SÁnchez, Polym. Degrad. Stab. 60 (1998) 33.
F. Catalina, Rev. Plas. Mod. 75 (1998), 391.
B. E. Tiganis and R. A. Shanks, Y. Long, J. Appl. Polym. Sci. 59 (1996) 663.
Q. Ying, Y. Zhao and Y. Liu, Makromol. Chem. 192 (1991) 1041.
M. Marrone and F. P. La Mantia, Polymer Recycling 2 (1996) 17.
H. Hinsken, S. Moss, J.-R. Pauquet and H. Zweifel Polym. Degrad. Stab. 34 (1991), 279.
Y. Long, R. A. Shanks and Z. H. Stachurski, Prog. Polym. Sci 20 (1995) 651.
J. Varga, J. Mater. Sci. 27 (1992) 2557.
M. Patkar and S. A. Jabarin, J. Appl. Polym. Sci. 47 (1993) 1749.
H. S. Bu, S. Z. D. Cheng and B. Wunderlich, Makromol. Chem. Rapid Commun. 9 (1988) 76.
J. G. Williams, “Fracture Mechanics of Polymers” (Ellis Horwood, Chichester, 1987).
J. Varga, in“Polypropylene Structure, Blends and Composites, ” Vol. 1, edited by J. Karger-Kocsis (Chapman & Hall, London, 1995) Ch. 3.
M. Gahleitner, J. Wolfschwenger, C. Bachner, K. Bernreitner and W. Neissl, J. Appl. Polym. Sci. 61 (1996) 649.
A. Sharples, “Introduction to Polymer Crystallization” (Edwar Arnold, London, 1966).
A. Galeski, in “Polypropylene Structure, Blends and Composites, ” Vol. 1, edited by J. Karger-Kocsis (Chapman & Hall, London, 1995) Ch. 4.
N. Brown, in “Failure of Plastics, ” edited by W. BROSTOW and R. D. CORNELIUSSEN (Hanser, Munich, 1986) Ch. 6.
Y. Liu, C. H. L. Colin, R. W. Truss and N. J. Calos, Polymer 38 (1997) 2797.
R. Greco and F. Coppola, Plast. Rubb. Process. Applic. 6 (1986) 35.
J. Karger-Kocsis, in “Polypropylene Structure, Blends and Composites: Composites, ” Vol. 3, edited by J. Karger-Kocsis (Chapman & Hall, London, 1995) Ch. 2.
A. O. Ibhadon, J. Appl. Polym. Sci. 69 (1998) 2657.
R. Greco and G. Ragosta, J. Mater. Sci. 23 (1988) 4171.
M. Sugimoto, M. Ishikawa and K. Hatada, Polymer 36 (1995) 3675.
S. C. Tjong, J. S. Shen and R. K. Y. Li, ibid. 37 (1996) 2309.
J. Jancar, A. Dianselmo, T. Dibenedetto and J. Kucera, ibid. 34 (1993) 1684.
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Aurrekoetxea, J., Sarrionandia, M.A., Urrutibeascoa, I. et al. Effects of recycling on the microstructure and the mechanical properties of isotactic polypropylene. Journal of Materials Science 36, 2607–2613 (2001). https://doi.org/10.1023/A:1017983907260
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DOI: https://doi.org/10.1023/A:1017983907260