辐照
材料科学
低密度聚乙烯
流变学
高密度聚乙烯
聚乙烯
粘弹性
高分子化学
活化能
化学工程
复合材料
化学
有机化学
物理
核物理学
工程类
作者
A. Marek,Vincent Verney
标识
DOI:10.1016/j.eurpolymj.2015.09.003
摘要
The photo-rheology method was applied to determinate the differences in the rheological behavior of selected polyolefins (PP, HDPE and LDPE) over a range of temperatures, higher than melting temperatures (160–200 °C) and during UV irradiation as a coupled degradative conditions in air atmosphere. Both, UV mercury lamp and UV LED were used as irradiation source. Multiwave experiments were performed and viscoelastic data were plotted in the complex plane to obtain Cole–Cole plots at different conditions. It helped to assess the molecular evolution of the examined materials. The competition between chain scissions and chain recombination (crosslinking) was observed. Chain scission reactions occurred in PP and for HDPE and LDPE crosslinking reactions predominated, especially over 180 °C. UV irradiation intensified these effects. In the case of HDPE chain scission reactions were also observed especially below 180 °C in processes performed without UV. At higher temperature and under UV irradiation crosslinking reactions and increase of viscosity began to dominate. Despite different energy and emission spectra of irradiation sources, the similar effects were observed.
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