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Top: schematic of the amino functionalization of the PU-DMPA cast film and bulk polymer solution by 1,4-BDA and PLL, respectively, followed by the incorporation of HA. Bottom: ATR-FTIR spectra of the BDA-modified PU-DMPA (a), the PLL-modified PU-DMPA (b), the HA-modified PU-DMPA-BDA (c), and the HA-modified PU-DMPA-PLL (d).
