And
this experiment provided an evidence for that the HTCC in the
blend was crosslinked by GA. However, the crosslinked blend
films still showed a high antibacterial activity. The reactivity of Ntrimethylated
quaternary ammonium salt groups in HTTCC with
GA was lower than –NH2 due to steric effect, and much lower
than hydroxyl group in PVA. Thus much of groups with strong
bacterial activity in HTCC had not reacted with aldehyde groups
of GA and showed a high antibacterial efficacy. The high antibacterial
efficacy and its controllability of the crosslinked PVA–HTCC