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Synthesis, Surface and Spreading Properties of Lactobionamide-Grafted Amphiphilic Glycopolysiloxanes

Three lactobionamide-grafted amphiphilic glycopolysiloxanes (LBPS) were synthesized using a two-step method. First, the aminopropyl functional polysiloxanes (APSO) were synthesized by equilibrium polymerization; then, lactobionic acid was conjugated to the APSO to give the glycopolysiloxanes LBPS. The final compositions of the amphiphilic glycopolysiloxanes were characterized by FTIR and 1H NMR. Surface activities and spreading behaviors in aqueous solution of these three glycopolysiloxanes were investigated by surface tension measurements and contact angle measurements. The results show that these three glycopolysiloxanes have much higher surface activity than those of conventional carbon-carbon chain glycopolymers in aqueous solution and the spreading ability of three lactobionamide-grafted amphiphilic glycopolysiloxanes solution on low-energy surfaces is not only solely dependent on surface tension, but also dependent on hydrophilic-lipophilic balance of surfactant.