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-  2018 


DOI: 10.11951/j.issn.1005-0299.20170327

Keywords: 应力-光氧老化,交联度,缆索护套,凝胶含量,结晶度

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To improve anti-aging performance of bridge cable sheath, the stress light oxygen aging cracking behavior of different cross-linking polyethylene materials was studied by preparing micro crosslinked polyethylene material. The actual internal stress was calculated by measuring the shrinkage of cable sheath; and the cracking and aging behaviors of micro-crosslinked polyethylene under stress were studied by using various tools such as microscopic observation, strain measurement, Fourier Transform Infrared Spectroscopy, differential scanning calorimetry analysis, determination of gel content and so on. It can be found that the breaking time of samples was increased firstly and then decreased as the degree of crosslinking increased, and samples showed the slowest crack growing rate, best aging and cracking resistance at a crosslinking degree of~10%. The results showed that there was a positive correlation between oxidation rate and breaking time; and samples were fully oxidized when the cracks appeared on the surface. The gel content and the crystallinity of samples were increased with aging time.


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