The weathering resistance of quaternary High-density polyethylene (HDPE) composites: Effects of weld lines, formulation and degradation on tensile properties

David Viljoen; Johan Labuschagné; Ines Kuehnert

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The weathering resistance of quaternary High-density polyethylene (HDPE) composites: Effects of weld lines, formulation and degradation on tensile properties

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In this work, the effects of weld lines, additives and the degree of QUV weathering on the tensile behavior of a range of high-density polyethylene composites with calcium carbonate, stabilizers and a carbon black/SEBS masterbatch are studied. The degree of weathering is characterized using FTIR-derived carbonyl, doublebond and carbonate indexes based on curve fitting, to allow for the fairer comparison of specimens with and without calcium carbonate. Weld-line specimens exhibited more rapid degradation than that seen in the reference specimens, while the exposed surfaces of the specimens degraded more quickly than the unexposed surfaces. ISO G154 Cycle 1 and Cycle 6 weathering protocols were compared. The additives were found to be effective at decreasing oxidative degradation, albeit with reduced effects at higher loadings and in mixed systems. These findings were mirrored in the mechanical properties of the specimens, with the modified specimens even exhibiting broadly improved properties with increasing aging. Elongation at break was most sensitive to weathering, with increasing degradation with increasing weathering across almost all specimens.

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来源
《Journal of Polymer Science》 |2023年第16期|1912-1929|共18页
作者
David Viljoen; Johan Labuschagné; Ines Kuehnert;
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作者单位

Polymer Processing Department, Leibniz- Institut für Polymerforschung Dresden e.V., Dresden, Germany;

Department of Chemical Engineering, Institute of Applied Materials, University of Pretoria, Pretoria, South Africa;

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正文语种英语
中图分类有机化学;高分子化学（高聚物）;
关键词
calcium carbonate; carbon black; high-density polyethylene; hindered-amine light stabilizer; QUV; tensile testing; weathering stability; weld lines;

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The weathering resistance of quaternary High-density polyethylene (HDPE) composites: Effects of weld lines, formulation and degradation on tensile properties

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