原位聚合Gemini型阳离子分子-苯乙烯嵌段聚合物构筑阴离子导电膜

doi:10.11944/j.issn.1000-0518.2016.06.150309

摘要/Abstract

摘要：

借助引发剂过硫酸钾(KPS),采用原位聚合法将苯乙烯(St)与Gemini型阳离子分子顺丁烯二酸二乙酯撑基双[辛烷基二甲基氯/溴化铵](G_8-2-8)在季铵化壳聚糖(QCS)的醋酸溶液中,引发聚合形成不同嵌段比例(St与G_8-2-8的摩尔比)的嵌段聚合物。然后利用戊二醛(GA)为交联剂将QCS交联形成网状结构,将上述线性嵌段聚合物“锁定”在交联的QCS网状结构中,制备了一系列具有半互穿网络结构(Semi-IPN)的阴离子导电膜。性能测试的结果表明,该系列膜具有较高的机械性能和电导率。当G_8-2-8含量为QCS质量的20%,嵌段比例为5:1时,表现出最高的离子交换量(1.35 mmol/g),断裂伸长率(26.47%)和电导率(70 ℃,6.97×10^-2 S/cm)。热稳定性测定结果表明,该膜具有良好的热稳定性能,最低分解温度高于210 ℃。

关键词: 季铵化壳聚糖, Gemini型表面活性剂, 苯乙烯, 嵌段聚合物, 阴离子导电膜

Abstract:

Block copolymers with different block raties(n(St):n(G_8-2-8)) were prepared through in-situ polymerization in the acetic acid casting solution of quaternized chitosan(QCS), using styrene(St) and Gemini-type cationic molecules maleic acid diethyl brace base pairs [essien alkyl dimethyl chloride/ammonium bromide](G_8-2-8) as raw materials and potassium persulfate(KPS) as the initiator. A series of semi-interpenetrating network structure(Semi-IPN) of anion conducting membranes was prepared using glutaraldehyde(GA) as the crosslinking agent. The above linear block polymer was locked in the QCS network structure. The experimental results show that the anion conducting membrane has high mechanical properties and high anionic conductivity. The anion conducting membrane(n(St):n(G_8-2-8)=5:1, m(G_8-2-8):m(QCS)=20:100) shows the highest ion exchange capacity(1.35 mmol/g ), elongation at break(26.47%) and conductivity(70 ℃, 6.97×10^-2 S/cm). TGA results show that the membrane has good thermal stability and the initiate decomposition temperature is higher than 210 ℃.

Key words: quaternized chitosan, gemini surfactant, styrene, block copolymers, anion conducting membrane

张帆, 王璐璐, 王吉林, 封瑞江, 张扬. 原位聚合Gemini型阳离子分子-苯乙烯嵌段聚合物构筑阴离子导电膜[J]. 应用化学, 2016, 33(6): 693-700.

ZHANG Fan, WANG Lulu, WANG Jilin, FENG Ruijiang, ZHANG Yang. Gemini-type Cationic Molecules-Styrene Block Polymer Anion Conducting Membrane Prepared by in-situ Polymerization[J]. Chinese Journal of Applied Chemistry, 2016, 33(6): 693-700.

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