Material Analysis
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MP fast UV aging
Fenómeno do problema
MP after 48h UV irradiation, mechanical properties decline >20%, yellowing
Análise das causas
MP molecular chains rapidly degrade by photo-oxidation under UV; surface molecular chains break forming microcracks
Solução
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
Conclusão principal
fast UV aging is caused by photo-oxidation; UV absorber and HALS are key
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