The influence of carbon black on properties of orientated polypropylene 2. Thermal and photodegradation

摘要: Abstract This paper extends previously reported work and describes the effect of carbon black on thermal photo-oxidative degradation oriented polypropylene (PP) geotextile tapes. PP tapes containing with different particle size, structure (or aggregate shape), specific surface volatile content concentrations have been exposed separately to circulatory air ovens at 130°C UVB lamps 60°C respectively. The were studied using tensile tensiometric, IR spectrophotometric analytical (DSC) techniques. Thermal stabilities filled blacks having low contents are comparable those unfilled At given oven-exposure times, varying sizes structures, except for content, show only slight influence stability was not significantly affected in increased from 2.5 5% w/w highest adversely possibly because oxygenated groups present act as sensitisers. Dynamic analysis shows that magnitude shifts lower temperatures post-fusion oxidative exotherm ( T ) reflect respective losses properties supports previous evidence is a sensitive indicator degree polymer oxidation. However, presence increases UV durability these resistance terms inversely proportional diameter. sample high concentration reactive groups, measured relative inferior similar size. No observed, which agreed results black-containing polyethylene films under UVA exposures. overall suggests smallest will yield optimum stabilization behaviours. ©