کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5203885 | 1381943 | 2008 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photoageing of an electron beam cured polyurethane acrylate resin Photoageing of an electron beam cured polyurethane acrylate resin](/preview/png/5203885.png)
Photoageing reactions and kinetics on long wavelength irradiation of an electron beam (EB) cured resin are presented. The material studied is an aliphatic polyurethane acrylate resin. The chemical photoreactivity of the polymer was followed by infrared spectroscopy and UV-visible spectrophotometry. Two periods of photo-oxidation were found. In the first stage the reaction of acrylate functions remaining after EB polymerization leads to additional crosslinking and to oxidized products. The tip of an atomic force microscope was used as an indenter to follow the variation of stiffness at the surface resulting from crosslinking. In the second stage, oxidation rate decreases and photodegradation products are formed at a constant rate. A heterogeneous distribution of residual acrylates was evidenced across the coating thickness (thick films of 100 μm). An oxidation profile was also observed in the depth of the film after photoageing.
Journal: Polymer Degradation and Stability - Volume 93, Issue 6, June 2008, Pages 1122-1130