摘要：以正硅酸乙酯 (TEOS) 为硅源, 对碳酸钙进行包覆改性得到CaCO₃-SiO₂, 采用原位聚合法制备聚苯胺 (PANI) 包覆的碳酸钙基导电复合粉体 (CaCO₃-SiO₂-PANI) ;用扫描电子显微镜 (SEM) 、X射线衍射 (XRD) 、热重分析 (TG) 和电阻率测试等手段对样品进行分析表征, 探讨CaCO₃-SiO₂复合粉体与苯胺 (An) 质量比对导电复合粉体形貌、结构和电导率的影响。结果表明:随着m (CaCO₃-SiO₂) ∶m (An) 从1∶1增加至3∶1, 复合导电粉体的电导率从5.6×10^-2 S·cm^-1减小至5.7×10^-3 S·cm^-1;质量比为3∶1时, 导电复合粉体形貌变化明显, 产物中生成少量硫酸钙;聚苯胺包覆不会改变碳酸钙的晶型;该导电复合粉体在温度200℃以下具有良好的耐热性和较高的电导率。

关键词：导电复合粉体；碳酸钙；形貌；结构；电导率

Abstract：Calcium carbonate (CaCO₃) was successfully coated by SiO₂, then pol yaniline (PANI) was in situ polymerized to form a novel CaCO₃-SiO₂-PANI conductivity composite powders. The samples were characterized by the means of SEM, XRD, TG and resistivity meter, the effects of mass ratio m (CaCO₃-SiO₂) :m (An) on the morphology, structure and conductivity of CaCO₃-SiO₂-PANI powders were studied. The results shows that conductivity of CaCO₃-SiO₂/PANI powders decrease from 5.6 ×10^-2to 5.7 ×10^-3S·cm^-1with increasing mass ratio m (CaCO₃-SiO₂) :m (An) from 1:1 to 3:1. The morphology of CaCO₃-SiO₂-PANI changes obviously when mass ratio was 3:1 and CaSO₄ formed, coating with PANI did not change the structure of CaCO₃. The conductivity composite powders show good heat resistance and excellent conductivity when the temperature below 200 ℃.

Keywords: conductivity composite powders；calcium carbonate；morphology；structure；conductivity