Studies on coordination-crosslinking of soap-free polyacrylate hydrosol and metal ion

A new soap-free water-borne coating (solid content ca. 35 wt %) has been obtained by adding the coordination-crosslinking agent M(NH3)42+ into the —COO−-containing polyacrylate hydrosol (P—COO−). The transmission electron microscope analysis has been used to investigate the coordination-crosslinking process of the polyacrylate hydrosol with Zn(NH3)42+ in the water-borne coating of low concentration (solid content ca. 0.05 wt %). The existence of the coordination-crosslinking polymer (P—COO−)nM2+) both in the water-borne coating of low concentration (solid content ca. 0.3 wt %) and in the coating film has been detected by the linear sweep voltammetry polarographic analysis, ultraviolet-visible spectrographic analysis, and IR spectrographic analysis. All the experimental results show that the polyacrylate hydrosol (P—COO−) can take the coordination-crosslinking reaction with metal ion M2+ to form the coordination polymer [(P—COO−)nM2+]. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 2457–2463, 1997