Material Analysis
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Fast UV aging of EAA
Problem Phenomenon
After 48h of UV irradiation, the mechanical properties of EAA decrease by >20% and it yellows
Cause Analysis
EAA molecular chains rapidly degrade by photo-oxidation under UV; surface molecular chains break to form microcracks
Solution
1) Add 0.3-0.5wt% UV absorber to block UV; 2) Add 0.2wt% HALS for radical scavenging; 3) 2wt% carbon black to physically shield UV
Key Takeaway
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key
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