Material Analysis
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Fast PVA UV aging
Fenómeno del problema
After 48h UV irradiation, PVA mechanical properties decrease >20%, yellowing
Análisis de la causa
PVA molecular chains rapidly degrade by photo-oxidation under UV; surface molecular chains break forming microcracks
Solución
1) Add UV absorber 0.3-0.5wt% to block UV; 2) Add HALS 0.2wt% for radical scavenging; 3) Carbon black 2wt% to physically shield UV
Conclusión clave
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key
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