【摘要】：為得到具有高電導(dǎo)率和穩(wěn)定性的陰離子交換膜,采用兩步聚合法合成了含芴的序列式聚芳醚砜,經(jīng)付克氯甲基化、季銨化及堿化制備了季銨化聚芳醚砜,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))為交聯(lián)劑,通過直接交聯(lián)及后交聯(lián)法分別制備了2類序列交聯(lián)型陰離子交換膜.制得的膜材料離子交換容量為1.59~2.12 mmol/g,柔韌結(jié)實.與具有相似離子交換容量的非交聯(lián)膜相比,交聯(lián)膜的抗溶劑性能、尺寸穩(wěn)定性、離子電導(dǎo)率等性能均得到了提高.交聯(lián)膜在高溫水中的水解穩(wěn)定性、強(qiáng)堿性條件下的化學(xué)穩(wěn)定性顯著增強(qiáng).探討了直接澆鑄交聯(lián)處理及成膜后交聯(lián)處理2種交聯(lián)方式對膜性能的影響,結(jié)果表明,后交聯(lián)處理可以有效避免澆膜過程凝膠的形成,而且膜的穩(wěn)定性相對于未交聯(lián)膜有大幅度提高.尤其以TMHDA為交聯(lián)劑的后交聯(lián)膜的各項性能均優(yōu)于相應(yīng)非交聯(lián)膜,IEC為2.17 mmol/g的PCL-M(H)膜,在30°C時吸水率為99%,膜徑向尺寸變化率為15%,電導(dǎo)率為23.8 mS/cm,90°C時電導(dǎo)率達(dá)到82 mS/cm,經(jīng)過4 mol/L的NaOH溶液室溫處理240 h后,離子電導(dǎo)率損失為7.6%,100°C水處理24 h后重量損失為5.1%,表現(xiàn)出較好的穩(wěn)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 擄C, and the change rate of the radial dimension of the membrane was 15%. When the conductivity is 23.8 mS/cm,90 擄C, the conductivity of 82 mS/cm, is up to 82 mS/cm, the loss of ionic conductivity is 7.6 鈩，

本文編號：2344518