碳酸钙填充PP的断裂韧性研究

Studies of the Fracture Toughness of CaCO_3 filled PP Composite

用仪器化落重式冲击实验装置研究CaCO_3填充PP复合材料的断裂韧性。测量了CaCO_3含量为10wt%～40wt%复合材料试样的冲击强度、G_(?)(临界应变能释放速率)和K_(?)(临界应力强度因子)。结果表明,在上述CaCO_3含量范围内,CaCO_3填充PP的断裂韧性高于纯PP,当CaCO_3含量为20～30wt%时,断裂韧性达最大值。由此说明,在一定条件下,CaCO_3可改善PP的断裂韧性。此外,还简要地讨论了增韧机理。

The fracture toughness of CaCO_3 filled PP comopsite was studied by means of instrumented falling—weigh impact test. The impact strength, Gc (critical strain energy releasing rate)and Kc (critical stress strength factor)of the samples containing CaCO_3 from 1O wt% to 40 wt% were measured. The results showed that the fracture toughness of the above mentioned CaCO_3 filled PP was higher than that of pure PP, and the fracture toughness was maximum when the CaCO_3 content was 20～30 wt%. It was showed that the fracture toughness of PP could be improved by filling certain amount of CaCO_3. The toushening mechanism was also discussed briefly.