Material Analysis
9 views
MP fast UV aging
Problem Phenomenon
MP after 48h UV irradiation, mechanical properties decline >20%, yellowing
Cause Analysis
MP molecular chains rapidly degrade by photo-oxidation 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!