聚四氟乙烯导电复合膜的电化学制备和表征分析

PTFE

聚苯胺／聚四氟乙烯导电复合膜的电化学制备和表征分析
Electrochemical Synthesis and Characterization of Polyaniline/Polytetrafluoroethylene Conductive Composite Films
作　　者：邓姝皓[1,2] 王玉[1,2]

DENG Shuhao, WANG Yu（1 School of Materials Science and Engineering, Central South University, Changsha 410083;2 The Key  Laboratory of Nonferrous Metal, Changsha 410083）

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]有色金属教育部重点实验室,长沙410083

出　　处：《材料导报》 2012年第26卷第2期 34-39页,共6页

Materials Review

基　　金：中南大学研究生创新基金

摘　　要：在聚四氟乙烯（PTFE）微孔膜上电化学制备硫酸和磺基水杨酸（SSA）共掺杂的导电聚苯胺（PANI）复合膜，采用四因素三水平的正交设计法优化工艺条件，并在其上继续沉积银，研究了沉积银电流密度和时间及拉伸对复合膜电导率的影响。采用拉曼光谱、X射线衍射和扫描电镜对复合膜进行了表征。结果表明，在最佳工艺条件下制备的PTFE-PANI复合膜电导率可达36．9S／cm，此复合膜经20mA／cm2沉积4min的银可使其电导率显著提高到5379S／cm。对最优条件制备的PANI-PTFE和PANI—PTFE-Ag复合膜进行适当程度的拉伸均可提高其电导率，PT—FE系列复合膜展现出较优异的力学性能。拉曼光谱表明PTFE、PANI和银复合良好。复合膜有一定的结晶度。经拉伸后复合膜结晶度增大，电导率显著提高；PANI在PTFE上呈颗粒状生长，颗粒尺寸均匀，直径约为200nm，Ag呈树枝状镶嵌、覆盖在PANI颗粒间，与PANI复合很好并形成三维导电网络。

The synthesis of conductive polyaniline（PANI） co-doped by 5-sulfosalicylic acid（SSA） and sulfuric acid（H2 SO4 ） were achieved using electrochemical method in polytetrafluoroethylene（PTFE） supporting film, and the optimum condition of process was confirmed by orthogonal design. The influences of deposited current density, deposited time of silver（Ag） and tensile on the conductivity of composite films were also studied. The composite films were characterized by Raman spectroscopy, X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results show that the conductivity of PANI-PTFE composite film is 36.9S/cm synthesised under optimum condition. Deposited Ag by 20mA/em2 current density for 4 minutes into prior film sequentially, the conductivity of film increases to 5379S/cm significantly. Through appropriate tension for PANI-PTFE and PANI-PTFE-Ag composite films, the conductivity can be enhanced. Raman spectroscopy show that PANI, Ag and PTFE compound well. The composite films have crystallinity to some extent, and can be improved after tensile. PANI is small pellet which has a uniform diameter about 200nm, Ag is dentrites covered on or inlaid among the grains of PANI to forming three-dimensional conductive network.

关键词：聚苯胺 聚四氟乙烯 电化学制备 导电复合膜
polyaniline, polytetrafluoroethylene, electrochemical synthesis, conductive composite film ;

分类号：TQ151.4 [工业技术 > 化学工业 > 电化学工业 > 电解工业] TQ153.1 [工业技术 > 化学工业 > 电化学工业 > 电镀工业]

全文快照：conductive composite film 聚苯胺(PAN1)具有稳定性好、电导率高、掺杂机制特殊等优点，且制备成本低，是最具应用前景的导电高聚物之一，但由于分子间的强烈作用和高刚性链导致其难溶熔、难加工，在很大程度上限制了应用[1 ]。由于聚四氟乙烯(PT—FE)、聚乙烯醇、聚砜等是综合性能很优异的塑料，具有优良的化学稳定性，并且具有较好的力学性能[4 ]，将PANI与其复合在一定程度上可以提高PANI的可加工性_6J。本实验采用恒电流氧化法首次在PTFE微孔膜上电聚合PANI，制备出热稳定性高、力学性能优异的导电复合膜。为进一步提高电导率，又在其表面继续电沉积银，并发现沉积少量银即可大幅提高复合膜的电导率，使其电导率与金属接近，但制备成本较单纯金属箔或在绝缘高分子中掺入金属要低很多，使高分子膜金属复合有较好的应用前景。1 实验1．1 PTFE-PANI复合膜和PTFE—PANI-Ag复合膜的制备将含有硫酸(1mol／L)一苯胺(O．