Figure 4.

Surface-pressure increase in monolayers composed of di-18:0 PC induced by the insertion of SMA copolymer fractions obtained from commercial mixtures consisting of SMA 2:1 (A) or SMA 3:1 (B). All surface pressure isotherms were recorded for at least 30 min at room temperature (∼23°C). (C) The final surface-pressure values (t = 30 min) are plotted against the M_n of the SMA fractions. Full circles correspond to SMA fractions purified from commercial SMA 2:1 mixtures, and empty circles to those purified from commercial SMA 3:1 mixtures. SMA mixtures are indicated by diamonds. Error bars represent the range in at least two independent experiments. To see this figure in color, go online.