Mechanical Degradation Of Polypropylene: Effect Of Uv Irradiation

In studies of polymer degradation, one relates physical and chemical property changes to ageing conditions under the effect, usually, of a single initiating process. In order to study the possible existence of associated effects in the combined photo and mechanical degradation of polypropylene, the behavior of oriented and non-oriented film samples irradiated under load have been investigated, as well as the effect of UV-irradiation on samples being mechanically tested. Results indicate the existence of photo-tribo-chemical effects which have been detected by stress relaxation and stress-strain measurements, and by carbonyl index determinations. © 1993.4015964Allen, Fatimikun, Henman, Thermal and photochemical oxidation of polypropylene. Influence of residual catalyst levels in unstabilised diluent and gas phase polymers (1983) European Polymer Journal, 7, p. 551Geuskens, Nedelkos, (1987) Poly. Deg. & Stab., 19, p. 365Allen, Kotecho, Gardette, Lemaire, (1985) Poly. Deg. & Stab., 11, p. 181Vink, (1983) Degradation and Stabilization of Polyolefins, , N.S. Allen, Applied Science Publishers, LondonSchnabel, (1981) Polymer Degradation, Principles and Practical Applications, , Carl Hanser Verlag, MunichAllen, (1986) New Trends in the Photochemistry of Polymers, , N.S. Allen, J.F. Rabek, Elsevier, LondonBaumhardt-Neto, De Paoli, (1990) Quim. Nova, 13, p. 104Baumhardt-Neto, R. & De Paoli, M.-A., Poly. Deg. & StabIto, Okada, Kuriyama, (1980) Radiat. Phys. Chem., 16, p. 481Landi, Easterbrook, (1978) Polym. Engng Sci., 18, p. 113