CORRELATION BETWEEN ACCELERATED ULTRAVIOLET AGING AND OUTDOOR 、EXPOSURE (WUHAN AND LASA WITH THE SAME LATITUDE) TESTING OF MACROMOLECULAR MATERIALS

摘要

Correlation between accelerated ultraviolet aging and outdoor exposure (Wuhan and Lasa with the same latitude) testing of macromolecular materials was investigated by means of testing changes of carbonyl exponent of polythene and ultraviolet absorbance of polycarbonate, environment aging intensity of Wuhan and Lasa was also studied in this paper. The results were obtained as follows: By testing variations of carbonyl exponent of polythene and absorbance of polycarbonate, degradation behavior of materials could be studied.The ratio of carbonyl exponent after outdoor exposure for 1 month in Wuhan and Lasa to cycle accelerated ultraviolet exposure for 100h was in range of 0.7344-0.8094 and 0.7455-0.8194 separately. Year cumulative absorbance of polycarbonate in Wuhan and Lasa was equal to cycle accelerated ultraviolet exposure for 250h, 500h respectively. The ratio of environment aging intensity of Lasa to Wuhan was around 1.2. With the prolongation of cycle accelerated ultraviolet exposure time, the variations of carbonyl exponent of polythene and absorbance of polycarbonate were in the same shape of first order exponential decay curve. Accompany light of ultraviolet, existence of H2O in the sample further aggravate the degradation behavior of ultraviolet to polythene.