Material Analysis
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PBT Toughening Modification Route
Problem Phenomenon
Pure PBT has insufficient toughness and snap-fits break, while after toughening modification the fluidity decreases and filling becomes difficult
Cause Analysis
The addition of toughening agents inevitably leads to decreased fluidity; polymerization modification introduces flexible chain segments, and blending modification using reactive compatibilizers such as POE-g-GMA can take both interfacial bonding and toughness improvement into account
Solution
①For blending modification select the reactive compatibilizer POE-g-GMA; ②Select toughening agents with little effect on fluidity; ③Re-verify snap-fit parts according to the toughened grade
Key Takeaway
PBT toughening is a trade-off between fluidity and toughness; reactive compatibilization technology is the mainstream route to take both into account; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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