Material Analysis
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Fast UV aging of EMA
Problem Phenomenon
After 48h of UV irradiation, EMA mechanical properties decline >20% and yellowing occurs
Cause Analysis
EMA molecular chains undergo rapid photo-oxidative degradation under UV; surface molecular chains break forming microcracks
Solution
1) Add UV absorber 0.3-0.5wt% to block UV; 2) Add HALS 0.2wt% for radical scavenging; 3) Carbon black 2wt% physically shields UV
Key Takeaway
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are key
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