PVC与纳米碳酸钙复合材料的结构与性能研究

Investigation on Structure and Properties of PVC/Nano-CaCO_3 Composites

采用拉伸强度、断裂伸长率、冲击强度等力学参数对聚氯乙烯(PVC)/纳米CaCO3复合材料进行评价,并结合热重差示扫描量热仪、扫描电镜对复合材料的热稳定性和断面结构进行表征。结果表明:采用超声分散方法,选用NDZ-311/SG-Al 821复合改性剂改性的纳米CaCO3明显提高了PVC基复合材料的缺口冲击强度、断裂伸长率和热稳定性;当纳米CaCO3填充质量分数达15%时,PVC/纳米CaCO3复合材料的缺口冲击强度达22.34 kJ/m2,比未填充纳米CaCO3的提高了60.5%;当纳米CaCO3填充质量分数不高于20%时,用超声技术改性纳米CaCO3能很好地分散在PVC基体中。

The mechanical properties of PVC/nano-CaCO3 composites, such as tensile strength, elongation at break, and notched impact strength ect. were appraised. The thermal stability of the composites was analyzed by the method of TG-DSC, and the morphology of their fracture surface was observed by SEM. The results show that the notched impact strength, elongation at break, and thermal stability of PVC composites are improved remarkably by adding nano-CaCO3 modified NDZ-311/SG-Al 821 composite modification agent by ultrasonic dispersion technology. The notched impact strength of PVC/CaCO3 composites reaches 22.34 kJ/m^2 when nano-CaCO3 is 15%, and the notched impact strength increases by 60.5% than that of PVC. Nano-CaCO3 modified by ultrasonic dispersion technology can he dispersed uniformly in PVC when nano-CaCO3 is no more than 200%.