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将吸附有FeCl3的聚酰亚胺(PI)膜悬于不同溶剂的3,4-乙撑二氧噻吩(EDOT)溶液中,在PI膜表面原位合成了导电聚3,4-乙撑二氧噻吩(PEDOT)涂层.以UV-vis分析溶剂的溶剂化效应,以红外光谱和X射线光电子能谱分析PEDOT的分子结构和氧化态,研究溶剂对液相沉降聚合PEDOT的共轭链长度和掺杂度及导电性的影响.在研究的正庚烷、环己烷、甲苯和氯仿中,溶剂的溶剂化作用依次增强,在其EDOT溶液中沉降聚合产物PEDOT的共轭链长度和掺杂度也依次增大,PEDOT涂层的电导率分别为33.7 S/cm,43.8 S/cm,163.2 S/cm和77.2 S/cm,对PI膜的附着力由0级上升到5B级.溶剂的溶解能力和溶剂化效应增强,液相沉降聚合PEDOT分子的共轭链长度和掺杂度上升,涂层的电导率和附着力增加;溶剂化效应的影响尤为突出.

Polyimide(PI) films with adsorbed FeCl3 were suspended in EDOT solutions with different solvents and conducting poly(3,4-ethylenedioxythiophene) (PEDOT) coatings on PI films were synthesized in situ.The solubility of the solvents to EDOT and FeCl3 was checked by spectrophotometer and the solvating extents were examined by UV-vis-NIR spectroscope.The molecular structures of synthesized PEDOT were analyzed by ATR-FT-IR and the doping degrees were determined by XPS spectroscope.The sheet resistances of the PEDOT coatings were measured by four-point probe meter and the interface bonding was evaluated by tape detaching testing.The effects of solvents on the conjugative length and doping degree of synthesized PEDOT as well as electrical conductivity were investigated.From n-heptane,cyclohexane,toluene to chloroform,their solubility and solvating extent increase.The conjugative length and doping degree of PEDOT synthesized in their EDOT solutions increase in the same order.The electrical conductivity of PEDOT coatings synthesized in n-heptane,cyclohexane,toluene and chloroform solutions is 33.7 S/cm,43.8 S/cm,163.2 S/cm and 77.2 S/cm,respectively and the interface bonding alters from 0 grade to 5B grade.The conjugative length,doping degree,conductivity and interface bonding of PEDOT synthesized by liquid phased depositional polymerization increase with the solubility and solvating of the solvents adopted and solvation has more promising contribution to the increments.