染料改性壳聚糖阴离子交换膜的制备及其性能研究

Study on The Synthesis of Novel CTS / LCRD Anion-Exchange Membrane and Its Conductive Property

利用1-氨基蒽醌、三聚氯氰、二甲基丙二胺、硫酸二乙酯合成季铵盐阳离子活性染料LCRD,配制壳聚糖醋酸溶液,采用共混-化学交联联用法制备染料改性壳聚糖阴离子交换膜。采用交流(AC)阻抗、傅立叶变换红外(FTIR)光谱、扫描电镜(SEM)、热重分析(TGA)等分析技术考察膜的离子电导率、分子结构、微观形貌、热稳定性和耐碱稳定性等性能。试验结果表明,所制备的CTS/LCRD膜(质量比1︰0.5)电导率达到3.18×10^(-3)s/cm,将其置于KOH溶液(80℃,6 mol/L)中168 h后取出,膜的电导率未下降,相反提高到5.33×10^(-3)s/cm。

1-aminoanthraquinone,cyanuric chloride,dimethyl propylene diamine and diethyl sulfate were used as reactants to synthesize cationic reactive dye LCRD and to prepare chitosan-acetic acid solution. Then,a novel anionexchange membrane was prepared by blending-chemical crosslinking method. Ionic conductivity, molecular structure,microstructure,thermostability and alkali resistance stability of the membrane were investigated through AC-impedance spectroscopy,FTIR spectroscopy,scanning electron microscopy（ SEM） and thermal gravity analysis（ TG）. The results show that the conductivity of CTS/LCRD membrane（ mass ratio 1︰0. 5） reaches 3. 18 ×10-3s / cm.In addition,after it is immersed in the KOH solution（ 80 ℃,6 mol / L） for 168 hours,the conductivity of the membrane doesn’t decrease; on the contrary,it increases to 5. 33 × 10-3s / cm.