Molding Process
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Low low-temperature impact strength of PLA
Problem Phenomenon
PLA products have low impact strength at low temperature (<0°C) and are easy to break.
Cause Analysis
The inherent brittleness of PLA is more prominent at low temperature; Tg is about 55-60°C, and below Tg the molecular chain movement is severely restricted.
Solution
Use toughened modified PLA; avoid notches in product design; do not use in low-temperature impact applications.
Key Takeaway
The low-temperature brittleness of PLA is its inherent weakness.
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