A series of pentiptycene-containing disulfonated polysulfone copolymers (PENT-BP) were synthesized via condensation polymerization. Water and salt transport properties (solubility, diffusivity and permeability) were characterized for acid-form membranes (PENT-BP(H)) and compared with triptycene-based sulfonated polysulfones (TRP-BP(H)) and a non-iptycene-containing 4,4′-biphenol-based series (BPS(H)) of polysulfones to investigate the effect of pentiptycene on membrane performance. At comparable water content, the PENT-BP(H) exhibited increased water and salt permeability due to the additional free volume introduced by the pentiptycene units. Enhanced water/salt permeability selectivity of PENT-BP(H) series was also observed due to a significantly higher diffusivity selectivity. At comparable water permeance ($P_w^D~8\times {10}^{-6}c{m}^2/s$), the salt rejection of PENT-BP (H) copolymers obtained from dead-end filtration reached 91–93% at 400 psi, higher than that of a corresponding BPS(H) series. This study suggests that incorporation of iptycene moieties into polymer backbone is an effective strategy to enhance desalination membrane performance.

通过缩聚反应合成了一系列含戊烯的二磺化聚砜共聚物（PENT-BP）。对酸形式膜 (PENT-BP(H)) 的水和盐传输特性（溶解度、扩散性和渗透性）进行了表征，并与基于三苯乙烯的磺化聚砜 (TRP-BP(H)) 和不含异戊烯的聚砜进行了比较4,4'-双酚基系列 (BPS(H)) 的聚砜，用于研究喷丁烯对膜性能的影响。在相当的水含量下，由于戊烯单元引入的额外自由体积，PENT-BP(H) 表现出增加的水和盐渗透性。由于显着更高的扩散选择性，还观察到 PENT-BP(H) 系列的增强的水/盐渗透选择性。在可比的水渗透率 (${磷}_{瓦}^D~8\times {10}^{-6}C{米}^2/秒$)，从死端过滤获得的 PENT-BP (H) 共聚物的盐截留率在 400 psi 下达到 91-93%，高于相应的 BPS(H) 系列。该研究表明，将iptycene 部分掺入聚合物主链是提高海水淡化膜性能的有效策略。