采用超临界流体技术和原位聚合法合成了聚苯胺-聚氨酯导电复合材料。本法由超临界流体插嵌技术向聚氨酯基体树脂中引入苯胺单体和后期的氧化掺杂技术组成,扫描电镜、电导率测定和热重TGA实验都显示了导电复合物的合成,并且在低压条件下制备得到的产品具有更高的电导性能。总体上复合材料的电导率在10^-4 - 10^-3S/cm范围。
The preparation of an electrical conducting polymeric composite consisting of polyaniline (PAni) and an insulating host polyure- thane (PU) is reported in this study. The host polymer was blended with aniline monomer using supercritical carbon dioxide (SCCO2 ) as the carrying solvent. After the blending process, the blended host polymer was soaked in an oxidant solution. Scanning electron microscope (SEM) and electrical conductivity analyses, as well as the thermal decomposition temperatures from the TGA curves where temperatures rise from pure PU to doped composite, indicate blending took place in SCCO2 , and polymerization was proceeding when the aniline/PU blend was soaking in the oxidant and doping solution. The maximum conductivity of the polymer composites was obtained with a lower pressure in SCCO2 , which is determined by the specific malti-phase effect. In general, the composites show conductivity in the range from 10^-4 - 10^-3 S/ cm.