The synthesis and the characterization of crosslinked ABC triblock copolymer, i.e. polystyrene-b-poly (hydroxyethyl methacrylate)-b-poly(styrene sulfonic acid), (PS-b-PHEMA-b-PSSA) is reported. PS-b-PHEMA-b-PSSA triblock copolymer at 20:10:70 wt% was sequentially synthesized via atom transfer radical polymerization (ATRP). The middle block was crosslinked by sulfosuccinic acid (SA) via the esterification reaction between -OH of PHEMA and -COOH of SA, as demonstrated by FTIR spectroscopy. As increasing amounts of SA, ion exchange capacity (IEC) continuously increased from 2.13 to 2.82 meq/g but water uptake decreased from 181.8 to 82.7%, resulting from the competitive effect between crosslinked structure and the increasing concentration of sulfonic acid group. A maximum proton conductivity of crosslinked triblock copolymer membrane at room temperature reached up to 0.198 S/cm at 3.8 w% of SA, which was more than two-fold higher than that of Nafion 117(0.08 S/cm). Transmission electron microscopy (TEM) analysis clearly showed that the PS-b-PHEMA-b-PSSA triblock copolymer is microphase-separated with a nanometer range and well developed to provide the connectivity of ionic PSSA domains. The membranes exhibited the good thermal properties up to 250 °C presumably resulting from the microphase-separated and crosslinked structure of the membranes, as revealed by thermal gravimetric analysis (TGA).

中文翻译：

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电解质膜交联聚苯乙烯-b-聚甲基丙烯酸羟乙酯-b-聚苯乙烯磺酸三嵌段共聚物的合成

合成和交联的ABC三嵌段共聚物，聚苯乙烯-即的表征b -聚（甲基丙烯酸羟乙酯） - b -聚（苯乙烯磺酸），（PS- b -PHEMA- b -PSSA）被报告。PS- b -PHEMA- b经由原子转移自由基聚合（ATRP）依次合成20:10:70 wt％的-PSSA三嵌段共聚物。FTIR光谱表明，中间嵌段通过磺基琥珀酸（SA）通过PHEMA的-OH与SA的-COOH之间的酯化反应交联。随着SA含量的增加，离子交换容量（IEC）从2.13 meq / g连续增加，但吸水率从181.8降低到82.7％，这是由于交联结构与磺酸基团浓度增加之间的竞争作用所致。在SA 3.8 w％的条件下，交联三嵌段共聚物膜在室温下的最大质子传导率达到0.198 S / cm，比Nafion 117（0.08 S / cm）高两倍。透射电子显微镜（TEM）分析清楚地表明PS-b -PHEMA- b -PSSA三嵌段共聚物经过微相分离，具有纳米范围，并且经过良好开发，可提供离子PSSA域的连接性。该膜在高达250°C的温度下具有良好的热性能，这大概是由于膜的微相分离和交联结构所致，如热重分析（TGA）所揭示。