Cover Image, Volume 50, Issue 16


original image

The cover image shows wool fiber modified by amphiphilic graft terpolymers to improve dyeability [green: hydrophobic segments originating from poly(methacrylate)s stems; blue: hydrophilic segments originating from polyethers; yellow: reactive segments for connecting with wool]. In the work by Mitsuhiro Hirata, Takeshi Watanabe, Bungo Ochiai, and Takeshi Endo on page 3259, the amphiphilic graft terpolymers were synthesized by the graft-onto reaction of monoamino-terminated polyethers to poly(methacrylate)s bearing five-membered cyclic dithocarbonate moieties. The modification of wool was conducted via the disulfide exchange reaction between disulfide linkages in wool and the thiol groups in the graft terpolymers. The dyeability toward carthamin, a natural red pigment from safflower, was improved by the modification.