Material Analysis
2 views
Fast UV Aging of EVOH
Problem Phenomenon
After 48h UV irradiation, EVOH mechanical properties decline >20% with yellowing
Cause Analysis
EVOH 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% to physically shield UV
Key Takeaway
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are key
Was this helpful?
0 people found this helpful
Thank you for your feedback!