Material Analysis
15 visualizaciones
PET products embrittle at low temperatures
Fenómeno del problema
PET products become brittle in low-temperature environments below -20°C and easily shatter under impact.
Análisis de la causa
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.
Solución
Use toughened modified PET (PET/elastomer blend); avoid sharp corners in product design; reduce internal stress (increase mold temperature and anneal).
Conclusión clave
PET low-temperature brittleness is an inherent material characteristic and needs to be improved through formulation and design optimization.
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!