Material Analysis
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DSTDP fast UV aging
Problem Phenomenon
After 48h UV irradiation, DSTDP mechanical properties decrease >20%, yellowing
Cause Analysis
DSTDP 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
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