Material Drying
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PSU Trace Moisture High-temperature Degradation
Problem Phenomenon
[Problem Phenomenon] PSU equilibrium water absorption is only 0.6%, yet melt degradation and strength decline still occur due to moisture
Cause Analysis
PSU molecular structure has no hydrophilic groups and absorbs little water, but trace moisture triggers melt degradation under high temperatures above 280°C and strong shear; high processing temperatures amplify the effect of low moisture content
Solution
Fully dry before '2079851475616104452 and verify moisture content; manage moisture strictly under high-temperature grade processes; when degradation signs (discoloration, embrittlement) appear, check drying first; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low water absorption of PSU does not mean water-tolerant processing; even trace water degrades under high-temperature shear; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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