PPおよびPCフィルムの重畳暴露試験による紫外線劣化評価

概要

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The effects of the thickness on the ultraviolet (UV) degradation was investigated for polypropylene (PP) and polycarbonate (PC) using"layering-films exposure test." In this test, the films were stacked up as a layer and exposed to UV-light by the weathermeter. After the exposure, tensile tests were conducted for each film. It was found that the failure strain of PP decreased with the irradiation time irrespective of the mask-film-thickness (MFT) although the tendency of the decrease became weaker for larger value of MFT. On the other hand the failure strain of PC decreased only for MFT=0μm. The fractographic observation by SEM and the chemical analysis by the infrared spectroscopy also confirmed that the UV degradation gradually extended along the thickness direction in PP while it was limited on the irradiated surface layer in PC. The decrease in failure strain was correlated to the irradiation UV energy by taking account of the molecular weight change due to main chain scission.
一般社団法人日本機械学会の論文
1997-02-25