Processing Machinery
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PBAT poor compatibility with PLA
Problem Phenomenon
The PBAT/PLA blend system has poor compatibility, obvious phase separation, and limited improvement in mechanical properties.
Cause Analysis
Molecular polarity difference between PBAT and PLA; thermal degradation during processing produces reactive functional groups; weak phase interface bonding; insufficient chain extender.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Add chain extender (ADR etc.) which also acts as a compatibilizer; ②optimize processing temperature to reduce degradation; ③compatibilizer selection; ④blending process optimization.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBAT/PLA compatibility requires chain extender compatibilization; temperature management reduces degradation; compatibilization and chain extension are dual functions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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