【摘要】 在碱性条件下，借助三氯甲烷（CHCl₃）将醛基引入二苯并-18-冠-6（DB18C6）中，制得二甲酰基二苯并-18-冠-6（DDB18C6）；以DDB18C6与可溶性脱乙酰甲壳素（CTS）为原料，利用Schiff反应合成了小分子冠醚质量分数递增的接枝冠醚CTS膜，将其命名为C_a-CTS膜（a=m（DDB18C6）/m（C_a-CTS膜））；将C_a-CTS膜于碱液中进行离子交换，C_a-CTS膜通过氧空穴结构吸附K⁺，进而制得C_a-CTSK膜；对各阶段的样品膜进行了结构表征和性能测试。结果表明，随着冠醚接枝度的增加，CTS的热稳定性得到改善；当a=0.20时，C_0.20-CTSK膜的接枝度可达43.91%，吸水率可达168.6%,IEC为1.38 mmol/g；在温度为70℃的条件下，C_0.20-CTSK膜的电导率可达46.8 m S/cm；冠醚的接枝引入改善了该系列膜的耐碱稳定性；C_a-CTSK系列膜在6 mol/L的KOH溶液中浸泡480 h，电导率降低幅度仅为4.0%。更多还原

【Abstract】 Under alkaline conditions,the aldehyde group is introduced into dibenzo-18-crown-6 （DB18C6） with the help of chloroform （CHCl₃） to prepare dimethyl dibenzo-18-crown-6 （DDB18C6）.Then,using DDB18C6 and soluble deacetylated chitin（CTS） as raw materials,Schiff reaction was used to synthesize a grafted crown ether CTS membrane with an increasing mass fraction of small molecule crown ethers,which was named C_a-CTS membrane （a=m（DDB18C6）/m（C_a-CTS membrane））.The C_aCTS membrane is ion exchanged in alkali solution.The C_a-CTS membrane absorbs K⁺through the oxygen hole structure,and then the C_a-CTSK membrane is prepared.Eeach stage the sample membrane was subjected to structural characterization and performance testing.The results show that with the increase of the crown ether grafting degree,the thermal stability of CTS can be improved;when a=0.20,the grafting degree of C_0.20-CTSK membrane can reach 43.91%,the water absorption rate can reach168.6%,the IEC value is 1.38 mmol/g.At a temperature of 70℃,the conductivity of C_0.20-CTSK membrane can reach 46.8 m S/cm;the introduction of grafting of crown ether improves the alkali resistance stability of this series of membranes.After the C_aCTSK series membranes are soaked in 6 mol/L KOH solution for 480 hours,the conductivity decreases only 4.0%.更多还原