We measured N2 sorption isotherms for all SHCP polymers at 77 K to gain information about their porous properties (Figure and). The sulfonated networks showed excellent reproducibility regarding their porous properties. Networks displayed characteristics of both Type I and Type IVa isotherms, with uptake at low relative pressures signalling microporosity and significant hysteresis observed upon desorption deriving from capillary condensation, indicative here of mesoporosity/macroporosity. All SHCPs displayed H2 type hysteresis curves, indicative of broad pore size distributions with narrow pore necks. The absence of a closed hysteresis loop is common in the isotherms of HCPs and likely due to the swelling of the networks during adsorption. With increasing sulfonation density the hysteresis loops upon desorption appear less pronounced, indicating that the mesopore component of the networks decreases. This is reflected in the values for total pore volume, VTOT, and micropore volume, VMICRO (Figure , Table ), which confirmed the broad pore size distribution. Intriguingly, the micropore volume remains relatively constant with increasing degrees of sulfonation from SHCP-3 onward, permitting the careful control of micropore-to-mesopore/macropore ratio in SHCPs.