Material Analysis
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MP fast UV aging
Fenómeno del problema
MP after 48h UV irradiation, mechanical properties decline >20%, yellowing
Análisis de la causa
MP 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 key
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