碳酸钙填充β-成核PP复合材料的力学性能

为研究β-晶对碳酸钙填充PP复合材料力学性能的影响,该文采用负载β-成核剂的纳米碳酸钙(β-CC)混合纳米碳酸钙(CC)或微米碳酸钙(WC)填充PP制备了β-PP复合材料及其PP-g-MA、POE-g-MA和EVA-g-MA作为相容剂的增容复合材料。力学性能研究结果表明,随着CC和WC用量增加,PP拉伸强度降低、模量提高;β-CC填充PP复合材料模量提高,拉伸强度变化不大。PP-g-MA增容提高填充PP复合材料拉伸强度、杨氏模量和冲击强度;POE-g-MA增容明显提高冲击强度,EVA-g-MA增容降低拉伸性能。β-CC/PP复合材料冲击强度随着β-CC用量增加而提高,β-CC/CC/PP和β-CC/WC/PP冲击强度高于CC/PP(w(CC)/w(PP)=5/95)和WC/PP(w(WC)/w(PP)=5/95)复合材料归结于高韧性β-晶形成。

Mechanical Properties of CaCO3 Filled β-Polypropylene Composites

In order to investigate the influence of β-phase on the mechanical properties of CaCO₃/polypropylene (CaCO₃/PP) composites, β-PP composites were prepared by PP filled with the mixture of nano CaCO₃ (CC) supported with β-nucleating agent (β-CC) and CC or micro CaCO₃ (WC). Using PP-g-MA, POE-g-MA and EVA-g-MA as compatibilizers, the compatibilized composites were also prepared. The results indicated that the tensile strength of PP composites decreased and tensile modulus increased with increasing the content of CaCO₃. Addition of β-CC increased tensile modulus of PP and had no influence on the tensile strength of PP. Compatibilization of PP-g-MA increased the tensile strength, tensile modulus and impact strength of filled PP composites. Compatibilization of POE-g-MA significantly increased the impact strength of filled PP composites. Compatibilization of EVA-g-MA decreased the tensile properties of filled PP composites. The impact strength of β-CC/PP composites increased with increasing the content of β-CC and the impact strength of β-CC/CC/PP and β-CC/WC/PP were higher than those of CC/PP(w(CC)/w(PP)=5/95) and WC/PP(w(WC)/w(PP)=5/95),due to the formation of β phase.