Material Analysis
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EVOH Hydrolytic Aging
Problem Phenomenon
EVOH products in hot-humid environment show mechanical decline >25%
Cause Analysis
EVOH contains polar groups that hydrolyze and break chains under hot-humid conditions; ester bonds/amide bonds etc. are water-sensitive
Solution
1) Select low-polarity-content grade to reduce hydrolysis tendency; 2) Add anti-hydrolysis stabilizer; 3) Coat product surface with waterproof layer
Key Takeaway
Hydrolytic aging is caused by water-sensitive polar groups; selecting low-polarity grade is key
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