序列式含芴季铵化聚芳醚砜阴离子交换膜的制备及交联改性
发布时间：2018-11-20 09:18
【摘要】：为得到具有高电导率和稳定性的阴离子交换膜,采用两步聚合法合成了含芴的序列式聚芳醚砜,经付克氯甲基化、季铵化及碱化制备了季铵化聚芳醚砜,并以脂肪族二胺(N,N,N′,N′-四甲基丙二胺(TMPDA)及N,N,N′,N′-四甲基己二胺(TMHDA))为交联剂,通过直接交联及后交联法分别制备了2类序列交联型阴离子交换膜.制得的膜材料离子交换容量为1.59~2.12 mmol/g,柔韧结实.与具有相似离子交换容量的非交联膜相比,交联膜的抗溶剂性能、尺寸稳定性、离子电导率等性能均得到了提高.交联膜在高温水中的水解稳定性、强碱性条件下的化学稳定性显著增强.探讨了直接浇铸交联处理及成膜后交联处理2种交联方式对膜性能的影响,结果表明,后交联处理可以有效避免浇膜过程凝胶的形成,而且膜的稳定性相对于未交联膜有大幅度提高.尤其以TMHDA为交联剂的后交联膜的各项性能均优于相应非交联膜,IEC为2.17 mmol/g的PCL-M(H)膜,在30°C时吸水率为99%,膜径向尺寸变化率为15%,电导率为23.8 mS/cm,90°C时电导率达到82 mS/cm,经过4 mol/L的NaOH溶液室温处理240 h后,离子电导率损失为7.6%,100°C水处理24 h后重量损失为5.1%,表现出较好的稳定性.
[Abstract]:In order to obtain an anion exchange membrane with high conductivity and stability, a series of poly (aryl ether sulfone) containing fluorene was synthesized by two-step polymerization. The quaternary ammonium polyaryl ether sulfone was synthesized by chloromethylation, quaternary ammonium and alkalization of fluorene. Two kinds of serially crosslinked anion exchange membranes were prepared by direct crosslinking and post-crosslinking methods, respectively, using (TMPDA) and (TMHDA) as crosslinkers. The ion exchange capacity of the prepared membrane is 1.59 ~ 2.12 mmol/g,. Compared with the non-crosslinked membrane with similar ion exchange capacity, the antisolvent performance, dimensional stability and ionic conductivity of the cross-linked membrane were improved. The hydrolytic stability of the crosslinked membrane in high temperature water was significantly enhanced, and the chemical stability was enhanced under strong alkalinity. The effects of two kinds of crosslinking methods on the properties of the films were discussed. The results showed that the gel formation during the casting process could be effectively avoided by the post-crosslinking treatment. Moreover, the stability of the membrane was greatly improved compared with that of the uncrosslinked membrane. In particular, the properties of the post-crosslinking membrane with TMHDA as crosslinking agent were superior to those of the corresponding non-crosslinking membrane. When the IEC was 2.17 mmol/g, the water absorption of the PCL-M (H) membrane was 99% at 30 掳C, and the change rate of the radial dimension of the membrane was 15%. When the conductivity is 23.8 mS/cm,90 掳C, the conductivity of 82 mS/cm, is up to 82 mS/cm, the loss of ionic conductivity is 7.6 鈩，
本文编号：2344518
[Abstract]:In order to obtain an anion exchange membrane with high conductivity and stability, a series of poly (aryl ether sulfone) containing fluorene was synthesized by two-step polymerization. The quaternary ammonium polyaryl ether sulfone was synthesized by chloromethylation, quaternary ammonium and alkalization of fluorene. Two kinds of serially crosslinked anion exchange membranes were prepared by direct crosslinking and post-crosslinking methods, respectively, using (TMPDA) and (TMHDA) as crosslinkers. The ion exchange capacity of the prepared membrane is 1.59 ~ 2.12 mmol/g,. Compared with the non-crosslinked membrane with similar ion exchange capacity, the antisolvent performance, dimensional stability and ionic conductivity of the cross-linked membrane were improved. The hydrolytic stability of the crosslinked membrane in high temperature water was significantly enhanced, and the chemical stability was enhanced under strong alkalinity. The effects of two kinds of crosslinking methods on the properties of the films were discussed. The results showed that the gel formation during the casting process could be effectively avoided by the post-crosslinking treatment. Moreover, the stability of the membrane was greatly improved compared with that of the uncrosslinked membrane. In particular, the properties of the post-crosslinking membrane with TMHDA as crosslinking agent were superior to those of the corresponding non-crosslinking membrane. When the IEC was 2.17 mmol/g, the water absorption of the PCL-M (H) membrane was 99% at 30 掳C, and the change rate of the radial dimension of the membrane was 15%. When the conductivity is 23.8 mS/cm,90 掳C, the conductivity of 82 mS/cm, is up to 82 mS/cm, the loss of ionic conductivity is 7.6 鈩，
本文编号：2344518
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