Material Analysis
13 مشاهدة
PET products embrittle at low temperatures
ظاهرة المشكلة
PET products become brittle in low-temperature environments below -20°C and easily shatter under impact.
تحليل الأسباب
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.
الحل
Use toughened modified PET (PET/elastomer blend); avoid sharp corners in product design; reduce internal stress (increase mold temperature and anneal).
الخلاصة الأساسية
PET low-temperature brittleness is an inherent material characteristic and needs to be improved through formulation and design optimization.
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