Energy storage and surface protection properties of dianiline co-polymers. Issue 129 (16th December 2015)

• Record Type: Journal Article
• Authors: Thota, Apparao; Arukula, Ravi; Narayan, Ramanuj; Rao, Chepuri R. K.; Raju, K. V. S. N.
• Is Part Of: RSC advances. Volume 5:Issue 129(2015)
• Page Start: 106523
• Page End: 106535
• Publication Date: 2015-12-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra11731c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Phosphoric acid doped co-polyanilines of substituted anilines and dianiline give conductivities up to 9.25 × 10 −2 S cm −1, specific capacitances on a stainless steel capacitor of 110–176.76 F g −1 at 0.5 A g −1 and have high corrosion resistance on a steel surface. Abstract : Conducting co-polyanilines of alkyl/alkoxy substituted anilines with dianiline, namely poly(OT–DA), poly(OA–DA) and poly(DMA–DA), have been synthesized chemically from o -toluedine(OT), o -anisidine(OA), 2, 6-dimethylaniline(DMA) and N -phenyl- p -phenylenediamine (DA). These co-polyanilines were characterized by spectral, thermal and electrochemical techniques. The conductivities of phosphoric acid (PA) doped co-polydianilines are 2.26 × 10 −1 S cm −1 for poly(OT–DA), 7.94 × 10 −2 S cm −1 for poly(OA–DA) and 9.25 × 10 −2 S cm −1 for poly(DMA–DA) at room temperature. The thermal stability of co-polymers is higher in the doped state than in the emeraldine base state. A capacitor has been fabricated using these polymers using stainless steel electrodes. The specific capacitance of the device is 177 F g −1 for poly(OT–DA)–PA, 110 F g −1 for poly(OA–DA)–PA and 121 F g −1 for poly(DMA–DA)–PA at 1 mA cm −2 current density. The anti-corrosion behaviour of co-polydianilines (EB state) coated on mild steel (MS) electrode was investigated by Tafel polarization method and the corrosion rate is found to be 2.07 × 10 −6 mm per year for poly(OT–DA)–EB, 1.42 × 10 −5 mm per year for poly(OA–DA)–EB and 5.3 × 10 −4 mm per year for poly(DMA–DA)–EB.