FIGURE 3.

(a) Snapshot of simulated geometrical structure of polyvinyl alcohol/tannic acid (PVA‐TA) and the hydrogen bonds between them. For clarity, the TA molecules were marked magenta and the PVA molecules were marked indigo blue. In the enlarged image, the hydrogen bonds are delineated by the yellow dashed lines. (b) The number of close contacts (pairs within 0.35 nm and hydrogen bonds) between TA and PVA molecules. (c) The radial distribution functions (RDFs) of O—H atomic pairs obtained from the molecular dynamics (MD) trajectory.