酸浓度和聚合周期对DBSA掺杂PANI结构性能的影响

Study on Effect of Acid Concentration and Polymerization Cycle on PANI Doped with DBSA

摘要:

采用循环伏安法在镀金PET膜上聚合了十二烷基苯磺酸（DBSA）掺杂的聚苯胺（PANI）膜，通过对比不同条件下所得PANI膜的红外光谱、微观形貌、循环伏安特性、X-射线衍射谱和紫外-可见光-近红外反射光谱，研究了DBSA浓度和聚合时间对PANI结构和性能的影响。结果表明：DBSA-可以通过电化学聚合过程掺入PANI分子链，由于长链烷基的增容作用，PANI呈纤维状。电化学聚合过程中，随DBSA浓度增大，PANI成核速率增加，易形成片状致密结构，造成PANI膜结晶度升高、离子空间位阻变大，且膜的光谱反射率逐渐降低。随聚合时间的增加，PANI表面形貌逐渐变差，出现团簇现象，成核速率逐渐增加，PANI纤维横向生长形成带状。

Abstract:

Polyaline(PANI) films doped with dodecyl benzene sulfonic acid (DBSA) were polymerized by cyclic voltammetry on gold-plated PET films. To research the effect of acid concentration and polymerization cycle on PANI, infrared spectra, micro morphology, cyclic voltammetry curves, X-ray diffraction patterns and UV-vis-NIR reflection spectra were measured respectively. Results show that DBSA- could incorporate into PANI molecular chains, which lead to form PANI fibers by compatibilization of long-chain alkyl in DBSA-. In polymerization progress, the polymerization rate increased as DBSA concentration increasing, which lead to flaky dense structure, high degree of crystallinity, large ion steric hindrance and low spectral reflectance. With the increase of polymerization time, surface morphology of PANI becomes worse and appears clusters phenomenon, nucleation rate gradually increase and fibers grow laterally into bands.