Fig. 4

A Effect of solution pH on the degree of protonation of the P and M chains. B Three possible membrane structures depending on the block copolymer morphology: 1 AB diblock copolymers form an interdigitated membrane with chemically identical faces; 2 ABC triblock copolymers where the central hydrophobic ‘B’ block bridges the membrane with segregated ‘A’ and ‘C’ interfaces; 3 central ‘B’ block of ABC triblock copolymer forms a ‘loop’ within the membrane, with the ‘A’ and ‘C’ chains forming a non-segregated membrane. C Effect of varying the relative volume fractions of the hydrophilic ‘A’ and ‘C’ blocks on the polymersome structure [110]