Material Analysis
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PET products embrittle at low temperatures
Problem Phenomenon
PET products become brittle in low-temperature environments below -20°C and easily shatter under impact.
Cause Analysis
PET Tg is about 70-80°C, but secondary transitions and molecular chain segment movement are restricted, resulting in insufficient low-temperature toughness and no toughening modification.
Solution
Use toughened modified PET (PET/elastomer blend); avoid sharp corners in product design; reduce internal stress (increase mold temperature and anneal).
Key Takeaway
PET low-temperature brittleness is an inherent material characteristic and needs to be improved through formulation and design optimization.
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