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Summary A series of cross‐linked blend membranes based on a linear poly(2,6‐dimethyl phenylene oxide) (PPO) and a hyperbranched poly(4‐vinylbenzyl chloride) (HVBC) are prepared via a simple solution casting procedure, followed by a cross‐linking treatment. The experiment indicates that the “HVBC enhancing PPO” membranes can have a looser cross‐linked “linear‐hyperbranched” blend structure, which is expected to improve the water absorption and dimensional stability. As a result, the excellent overall properties including high anion conductivity, low swelling, high strength, and excellent oxidative‐alkaline stability can be achieved simultaneously. A maximum conductivity of PPO‐HVBC‐100 (ion exchange capacity [IEC] ~ 1.88 mmol/g) is up to 135.9 mS/cm at 80°C, which is 2.9 times higher than that of pristine PPO membrane (IEC ~ 1.62 mmol/g). All the results reveal that the hyperbranched HVBC with a unique multi‐cation structure is a preferred “performance‐enhancing component” for the PPO‐based membranes, and this study also provides a novel idea for the preparation of high‐performance AEMs.

The sulfonic containing polymer bead was synthesized using sodium p-styrenesulfonate (SSS) and N,N′-methylenebisacrylamide (MBA) through inverse suspension polymerization and evaluated as catalyst for esterification of of n-octanol and acrylic acid. The influence of some principal factors, such as combination dispersant, crosslink agent content, posttreatment methods, and porogen types, was investigated in detail. The results showed that the morphology and characteristics of polymer beads were controllable. The polymer beads with 20wt% crosslink agent showed the best catalysis ability achieving almost 96% esterification conversion at the first time and 80% after 5 cycles.