【作者】 张璐；

【导师】 封伟；

【作者基本信息】 天津大学 ， 材料学， 2007， 硕士

【摘要】 静电纺丝技术是获得微-纳米纤维的相对简单和直观的方法,对聚苯胺静电纺丝微观形貌和电性能可控性的研究有助于加速导电聚合物纳米纤维在电子和纳米导线以及传感器等领域的应用。本文采用掺杂诱导法、乳液聚合-萃取法和乳液聚合法等经典的聚苯胺制备方法合成具有不同分子量和电导率的静电纺丝用聚苯胺。随着聚苯胺纺丝液体系的改变,影响电纺纤维微观形貌的因素是复杂且综合作用的。本文系统地对聚苯胺静电纺丝的溶液参数和过程参数进行讨论。影响聚苯胺电纺纤维微观形貌的溶液参数主要有聚苯胺浓度、PEO浓度、聚苯胺的分子量、电导率以及溶剂等。聚苯胺电导率和分子量的增加有利于提高静电纺丝溶液的可纺性;纤维直径随聚苯胺浓度、PEO浓度、聚苯胺分子量的增加而增大,随溶剂体系介电系数的增加而减小。影响电纺纤维微观形貌的过程参数主要有电压、接收距离和流速等。其中,降低流速有利于减小纤维的直径;纤维直径随电压和接收距离的改变呈抛物线状变化,选择合适的电压和接收距离可以获得状态连续、直径最小且分布均匀的纤维。通过静电纺丝方法制备的纤维膜具有很高的比表面积,同旋涂膜等低孔隙率的膜材料相比,体系电荷传输的影响因素更为复杂。本文讨论了聚苯胺的含量、PEO的含量、孔隙率和溶剂等因素对电纺纤维电导率的影响,聚苯胺膜材料的电导率随聚苯胺的含量、溶剂体系介电系数的增加而增大,随孔隙率的增加而降低,对于纤维膜而言,孔隙率是影响纤维膜电导率的最主要因素。本文通过对聚苯静电纺丝工艺系统的研究,获得了微观形貌可控的高比表面积的膜材料,并通过对纤维膜电性能系统的研究,初步实现了纤维膜电性能的可设计性,具有广泛的参考价值。更多还原

【Abstract】 Electrospinning was a simple method to prepare micro-nanoscaled fibers. The controllability of PANI electrospun fibers’microcosmic pattern and conductivity redounded to accelerate the speed of the application of conducting polymer in electronic area, nano wire and sensing device.In this dissertation, the doping induced method, emulsion polymerization extraction method and emulsion polymerization were adopted to prepare PANI with different molecular weight and conductivity for researching of electrospun process parameters. These influencing factors were complicated and interacted, and the optimum parameters were varied in different polymer solution.The concentration of PANI and PEO, molecular weight, conductivity of PANI, and solvents were primarily influencing factors of electrospun fibers’microcosmic pattern. The increase of polyaniline’s molecular weight and conductivity could improve the electrospun property and fibers’diameter increased with the concentration of PANI and PEO, dielectric constant of solvent and the molecular weight of PANI. The fibers’microcosmic pattern was also related to processing parameters such as electric voltage, acception distance and the polymer solution flow rate. Selecting appropriate voltage and acception distance could obtain optimum electrospun fibers with smaller fibers’diameters and better continuous fibers. Furthermore, the fibers’diameter increased with solution flow rate.Compared with the cast-film, electrospun fibers had huge specific surface area and the influencing factors of charge transfer were intricate. We discussed the mainly factors effected the conductivity of electrospun fibers such as the concentration of PANI and PEO, the porosity and the solvents. The electrospun fibers’conductivity increased with the concentration of PANI and the solvent dielectric constant, and decreased with the porosity. When these factors took place synchronously, the porosity factor was most important.Through our research on process parameters , PANI electrospun fibers with high controllability and specific surface area were preparation. Through the systematic study of electrospun fibers’electrical property, the dream of designable electrospun fibers’conductivity came true and the study possessed extensive reference value.更多还原