Processing Machinery
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PLA products are very brittle and easy to break
Problem Phenomenon
Products break brittlely upon impact, with low elongation at break.
Cause Analysis
PLA has a high glass transition temperature and slow crystallization rate, forming a rigid structure with inherently large brittleness; pure PLA is not suitable for products with high impact or flexibility requirements.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Add toughening agents or blend with elastic biopolymers such as PBSA; ② use epoxy compatibilizers such as Joncryl to improve the interface; ③ evaluate plasticizers to improve toughness; ④ perform impact verification for load-bearing applications.
Key Takeaway
Brittleness is PLA's most prominent performance shortcoming; blending and toughening is the mainstream solution, and compatibilizers can significantly increase elongation at break.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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