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Accelerated Aging Process of Carbon Black-Reinforced PVC (CB-PVC) Insulation by UVB-Induced Chemical Degradation
Summary
Researchers examined how UVB radiation degrades carbon black-filled PVC composites, finding a 30% drop in dielectric strength and 28% increase in surface roughness after 500 hours of exposure. Degradation followed a three-phase pattern driven by radical propagation and photo-oxidation, revealing how UV exposure compromises cable insulation materials.
This study examines the UVB-induced (Ultraviolet B radiation) degradation of carbon black-filled polyvinyl chloride (CB-PVC) composites. After 500 h of exposure, the material exhibited a 30.13% drop in dielectric strength, a 27.6% increase in surface roughness, and significant pit formation, indicating substantial physicochemical deterioration. Degradation followed a triphasic kinetic pattern: an initial induction phase, an autocatalytic acceleration, and a stabilization phase, driven by radical propagation and photo-oxidation. These findings highlight the complex role of UVB in the photodegradation of cable sheeting.