Fig. 7. (a) Static contact angles of water and ethylene glycol on P1 thin films with different E/Z ratios (n = 4), and (b) γ^d and γ^p of the surface free energies. The 0% Z isomer highlighted in light gray is E-P1. The others are prepared by photoirradiation of Z-P1. Illustration of interchain (orange) and intrachain (blue) hydrogen bonding between urethane linkages and hydrogen bonding between urethane linkage and water (gray) in (c) E-P1 and (d) Z-P1 thin films. Static contact angles of water and ethylene glycol on (e) P2 and (g) P3 thin films with different E/Z ratios (n = 4), and γ^d and γ^p of surface free energies of (f) P2 and (h) P3 thin films. Small standard deviations are added to (a), (e), and (g) as error bars but buried.