庚二酸钙/纳米碳酸钙协同增强增韧聚丙烯

Synergistic effects of Ca HA/nano-CaCO_3 on reinforced and toughened PP

采用庚二酸钙(CaHA)与纳米CaCO_3作为复配改性剂,通过熔融共混的方法制备了聚丙烯复合材料,并研究了复合材料的微观形态、热性能和力学性能。结果表明:当纳米CaCO_3和CaHA的质量分数分别为1.0%时,复合材料的力学性能最优,拉伸强度、弯曲强度和冲击强度分别为40.3 MPa,32.2 MPa,34.1 k J/m^2,较只加入1.0%的CaHA分别提高了3.6%,1.9%,2.4%,说明纳米CaCO_3和CaHA对于增强增韧聚丙烯具有明显的协同作用;加入纳米CaCO_3可提高复合材料的熔点和结晶温度,但w(CaCO_3)超过1.0%容易发生团聚而降低复合材料的力学性能。

Polypropylene（PP） composites were prepared via melt blending method with calcium pimelate（CaHA） and nano-calcium carbonate（CaCO3） as complex nucleating agents. The microscopic morphology,thermal and mechanical properties of the composites were investigated. The results show that the composites have the optimal mechanical properties when the mass fraction of Ca HA and nano-CaCO3 are 1.0% respectively,whose tensile strength,flexural strength and impact strength are 40.3 MPa,32.2 MPa and 34.1 k J/m^2 respectively,increasing by 3.6%,1.9% and 2.4% than those of the composites with CaHA of 1.0% only. It represents that CaCO3 and Ca HA play synergistic roles in reinforcing and toughening PP. The addition of nano-CaCO3 helps to enhance the melting point and crystallization temperature of the composites,while the agglomeration phenomenon occurs and weakens the mechanical properties of the material when the mass fraction of CaCO3 is beyond 1.0%.