Electrochemical studies for the electroactivity of amine-capped aniline trimer on the anticorrosion effect of as-prepared polyimide coatings

Advanced anticorrosive coatings prepared from electroactive polyimide/graphene nanocomposites with synergistic effects of redox catalytic capability and gas barrier properties

“…The results in Figure 8 and Table 1 indicate that the EPI-coated CRS coupon shows a higher E corr value than does the uncoated CRS, which is consistent with the results of earlier studies [15][16][17][18]. Moreover, the EPGN materials showed a higher E corr , R p , and P EF and lower I corr values than does the EPI.…”

“…In this study, the polymers were characterized by CV using a three-electrode electrochemical cell. As shown in Figure 7, the electrochemical CV results indicate that the EPGN materials (e.g., EPGN1) in the form of a coating showed a single oxidation peak, which was similar to the case of the EPI [17]. EPGN1 showed an oxidation current (I ox ) of 271.9 µA/cm 2 and a reduction current (I red ) of 376.6 µA/cm 2 ; the latter was smaller than that of the EPI (I ox = 141.3 µA/cm 2 , I red = 236.8 µA/cm 2 ).…”

“…Rcently, we have reported the synthesis of an EPI with oligoaniline in the main chain via a thermal imidization reaction and further introduced nanomaterials (e.g., clay nanosheets and TiO 2 nanoparticles) into the EPI to prepare EPI nanocomposites [15,16]. All the examined materials exhibited significant enhancement of the corrosion protection of the metallic substrate as compared with that of neat electroactive polymer coatings [17,18] since the well-dispersed nanoclay in the EPI with an aspect ratio of ~200 increasing the length of the diffusion pathways for reactive gases (e.g., oxygen and water vapor) in the polymers [15]. Extensive efforts are devoted to utilizing graphenebased materials such as graphene nanoplatelets (GNPs), graphene nanosheets (GNSs), and graphene oxide (GO) as nanofillers to improve the mechanical, thermal and dielectric properties, and electricity of diverse organic polymers [19][20][21][22][23][24][25][26] since scientists discovered excellent intrinsic properties of graphene sheets.…”

Advanced anticorrosive coatings prepared from electroactive polyimide–TiO2 hybrid nanocomposite materials

“…Furthermore, the electrochemical behaviors of electroactive polyamide with amine-capped aniline pentamer prepared by oxidative coupling polymerization had also been demonstrated by Zhang and co-workers [17][18][19][20][21]. Lately, Yeh et al reported the corrosion protection effect of organo-soluble electroactive polyimide containing amine-capped aniline trimer coated onto cold-rolled steel (CRS) electrode by performing series of electrochemical corrosion measurements in saline condition [22].…”

“…The as-prepared mixture was then stirred for an additional 2 h at room temperature under nitrogen. It was subsequently poured onto the supporting substrate to form the electroactive polyimide and then dried under vacuum at 60 • C for 3 h, 100 • C for 1 h, 200 • C for 1 h and 250 • C for 4 h, sequentially, to give EPI material [22].…”