Anode-selective coating of titanium(IV) oxide (TiO2) using electrophoretic sulfone-containing click polyester

We synthesized, at room temperature, aliphatic (1-4) and aromatic (5-8) poly(ester-sulfide) s, via a thiolene click polymerization of bis(pentenyl) methylsuccinate (BPMSA) and bis(pentenyl) phthalate (BPPh), respectively, with several dithiols including 1,2-ethanedithiol (EtDt), 1,3-propanedithiol (PrDt), 1,4butanedithiol (BuDt), and 1,5-pentanedithiol (PeDt) (M-n = 0.7-5.2 Chi 10(4), M-w/M-n = 1.6-2.6). Subsequent Oxone oxidation of poly(BPPh-alt-BuDt) (7), as an example, led to the corresponding poly(ester-sulfone) 7 ' (M-n = 30 000, M-w/M-n = 1.8). We then prepared a composite of 7 ' and TiO2 by using electrophoretic deposition (EPD). The TiO2/poly(ester-sulfone) 7 ' composite was selectively deposited onto a stainlesssteel anode. The electrode's morphology was confirmed by scanning electron microscopy. We characterized the relationship between the structure of the composite-coated electrode and the zeta potential of an N, N-dimethylformamide/alcohol suspension of poly(ester-sulfone) 7 '. The measured values, -(33.27-18.3) mV, indicate that the composite had indeed been selectively deposited on the anode. Notably, from the suspension with the negative potential of -33.27 mV, the thickest composite film was obtained. Furthermore, photo-catalytic activity occurred on the surface of the composite when immersed in aqueous rhodamine-B for 1 month.