纳米CaCO_3/PVC复合材料结构形态与冲击性能

Relationship between the Structure and Impact Property of Nano-CaCO3/PVC Composite

对改性纳米CaCO3/PVC复合材料进行冲击强度的测试。结果表明,改性纳米CaCO3可提高PVC复合材料的裂缝引发能和裂缝增长能,其中裂缝增长能的提高尤为明显。复合材料的单缺口冲击强度达到81.1kJ m-2。用透射电子显微镜及扫描电子显微镜观察了纳米CaCO3/PVC复合材料的微观结构及断面形态,发现表面改性后纳米CaCO3在PVC基体中达到了纳米级的分散,复合材料的断面产生了大量的网丝状结构。复合材料的微观结构进一步证实了纳米CaCO3对PVC基体的显著增韧作用。

Treated inorganic nanoparticle as a new function material can toughen polymer remarkably. The impact strength of nano-CaCO3/PVC composites was investigated. The results showed that the energy of crack initiation and energy of crack propagation of PVC composites were improved by the addition of treated nano-CaCO3 particles. The single-notched impact strength of the PVC nanocomposite reached 81.1kJm-2. And the microstructure of dispersed calcium carbonate nanoparticles in the nanocomposites was observed by the aid of electronic microscope. It was found that the treated CaCO3 nanoparticles were well-dispersed in PVC matrix at nano-scale. Using SEM the fracture section of composites was also observed. The microstructure of composites and fracture section further confirmed that the toughness of PVC was remarkably improved by the addition of treated nano-CaCO3 particles.