Abstract
A fracture mechanics approach to the ultraviolet-degradation embrittlement of polypropylene (PP) semi-crystalline homopolymer has been evaluated. The loss in fracture properties results mainly from embrittlement of the surface, resulting in surface defects. Hence, the fracture energies of degraded and single edge notched (SEN) specimens were compared to test to what extend they agree. PP specimens were degraded artificially in a Xenontest. Degradation depth was measured by Fourier transformed infrared (FTIR) spectrometry. Degraded and notched specimens were tested at different deformation velocities in three-point bending. Fracture energies of degraded specimens and specimens notched with a depth equal to that of degradation were compared. Differences were accounted for by different fracture processes which were observed by studying fracture surfaces.
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Schoolenberg, G.E. A fracture mechanics approach to the effects of UV-degradation on polypropylene. J Mater Sci 23, 1580–1590 (1988). https://doi.org/10.1007/BF01115695
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DOI: https://doi.org/10.1007/BF01115695