Abstract
Changes in [η] and crystallinity of commercial samples of isotactic polypropylene (i-PP), heterophasic ethylene–propylene copolymers [E–P copolymer] containing <16 mol% of ethylene and their fractions (having ethylene content 40.9 and 55.7 mol%) upon polychromatic irradiation in air at 55°C were studied by comparing unirradiated samples. Crystallinity was evaluated by DSC and X-ray diffraction. Viscosity results showed a decrease of molecular weight upon irradiation. DSC and X-ray studies revealed that the transition of α-modification to β-phase of polypropylene and also that crystallinity of the copolymer decreased initially upon irradiation. However, upon longer irradiation, the crystallinity increased again.
Similar content being viewed by others
Article PDF
References
S. Sivaram and R. P. Singh, Adv. Polym. Sci., 101, 169 (1991).
B. Ranby and J. F. Rabek, “Photodegradation, Photooxidation and Photostabilization of Polymers,” Wiley, London, 1975.
D. J. Carlsson, D. W. Grattan, T. Suprunchuk, and D. M. Wiles, J. Appl. Polym. Sci., 22, 2217 (1978).
M. Fujiyama, H. Awaya, and K. Azuma, J. Polym. Sci., Polym. Lett. Ed., 18, 105 (1980).
R. P. Singh, J. Lacoste, R. Arnaud, and J. Lemaire, Polym. Degradation and Stability, 20, 49 (1988).
G. Gueskens and M. S. Kabamba, Polym. Degradation and Stability, 4, 69 (1982).
S. K. L. Li and J. E. Guillet, Macromolecules, 17, 111 (1984).
J. C. Randall, Macromolecules, 11, 33 (1978).
L. E. Alexander, “X-Ray Diffraction in Polymer Science,” John Wiley and Sons, New York, N.Y., 1969, p 379.
J. K. Kocsis, L. Kiss, and V. N. Vuleznev, Polym. Commun., 25, 122 (1984).
F. De Canadia, R. Russo, and V. Vittoria, J. Macromol. Sci., B18, 257 (1980).
P. H. Herman and A. Weildinger, Macromol. Chem., 24, 44 (1961).
G. Natta and P. Corrdani, Nuvo Cimento, 15, 40 (1960).
A. Turner Jones, J. M. Aiglewood, and D. R. Becket, Macromol. Chem., 75, 134 (1964).
T. Hirosaka, Polym. J., 5, 111 (1973).
F. J. Padden and H. D. Keith, J. Appl. Phys., 30, 1479 (1959).
H. J. Leugering, Macromol. Chem., 109, 209 (1967).
G. Guerra, V. Petraccone, P. Corradini, C. De Rosa, R. Napolitano, and B. Pirrozi, J. Polym. Sci., Polym. Chem. Ed., 22, 1029 (1980).
H. H. G. Jellinek and F. Flagsman, J. Polym. Sci., 8, 711 (1970).
S. Z. D. Cheng and B. Wunderlich, J. Polym. Sci., Polym. Phys. Ed., 24, 595 (1986).
L. C. Lapez and G. L. Wilkes, Polymer, 29, 106 (1988).
J. K. Kocsis, A. Kallo, A. Szafner, G. Bodor, and Zs. Senyei, Polymer, 20, 37 (1979).
M. Joshi, A. Mishra, and S. N. Maiti, J. Appl. Polym. Sci., 43, 311 (1991).
A. J. Lovinger, J. O. Chua, and C. C. Gryte, J. Polym. Sci., Polym. Phys. Ed., 15, 641 (1977).
C. E. Locke and D. R. Paul, Polym. Eng. Sci., 13, 308 (1973).
R. P. Singh, R. Mani, S. Sivaram, J. Lacoste, and D. Vaillant, J. Appl. Polym. Sci., 50, 1871 (1993).
F. H. Winslow, C. J. Aloisio, W. L. Hawkins, W. Matrgek, and S. Matsuoka, Chem. Ind. (London), 533 (1963).
F. H. Winslow, C. J. Aloisio, W. L. Hawkins, W. Matrgek, and S. Matsuoka, Chem. Ind. (London), 1465 (1963).
C. De Rosa, G. Guerra, R. Napolitano, V. Petraccone, and B. Pirrozi, Eur. Polym. J., 20, 937 (1984).
H. W. Starkweather, F. A. Van Catledge, and R. N. Mc Donald, Macromolecules, 15, 1600 (1982).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mani, R., Singh, R., Sivaram, S. et al. Effect of UV Irradiation on The Structure of Heterophasic Ethylene-Propylene Copolymers. Polym J 26, 1132–1141 (1994). https://doi.org/10.1295/polymj.26.1132
Issue Date:
DOI: https://doi.org/10.1295/polymj.26.1132