双组分超分子凝胶材料的形成机理及流变性能  

The Forming Mechanism and Rheological Properties of Two-component Supramolecular Gel Materials

作　　者：薛敏[1] 张祥 刘璐[1] 常文浩 李蓓蓓 XUE Min;ZHANG Xiang;LIU Lu;CHANG Wenhao;LI Beibei(School of Chemical Engineering,Xi’an University,Xi’an 710065,China)

机构地区：[1]西安文理学院化学工程学院,西安710065

出　　处：《材料导报》2021年第8期201-206,共6页Materials Reports

基　　金：国家自然科学基金青年基金(21403166);陕西省自然科学基金(2020JQ-890);西安市科技计划创新基金(2017CGWL01);大学生创新创业训练计划项目(S201911080057)。

摘　　要：本工作合成了三种取代芳香羧酸化合物——DCn(n=14、16、18),测试了DCn与乙二胺(EDA)在溶剂中形成双组分超分子凝胶的能力。测试结果表明,DCn+EDA(1∶1,物质的量比)能将一些极性较大的溶剂(如H2O、DMF、DMSO等)胶凝。利用扫描电镜(SEM)观察了凝胶的微观形貌;红外光谱研究表明,双组分凝胶的形成是由于DCn与EDA反应生成的羧酸盐将溶剂胶凝;X射线衍射分析(XRD)研究表明,DC16+EDA(1∶1)在水中自组装形成的凝胶具有六方堆积结构。本工作还提出了双组分凝胶可能的多级自组装过程。流变学研究表明,DC18+EDA/DMF双组分凝胶对外界应力具有良好的耐受性,并表现出优异的剪切触变性。Three aromatic carboxylic acids,DCn(n=14,16,18),were synthesized,and their gelation behaviors with ethanediamine(EDA)were tes-ted in different solvents.The gelation tests revealed that DCn+EDA(1∶1)could form two-component supramolecular gels in some solvents with high polarity(H2O,DMF,DMSO).The microstructures of two-component gels were obtained via SEM,and FT-IR spectroscopy studies showed that the carboxylate formed by DCn and EDA gelated the solvents.X-ray diffraction(XRD)analysis revealed that in two-component gels,DC16+EDA(1∶1)took a hexagonal packing mode.On the basis of the results of IR and XRD analysis,a possible multi-stage self-assembly process for the two-component gels was proposed.The rheological studies showed that DC18+EDA/DMF gel had a good tolerance to external forces and possessed a reversible thixotropic property.

关 键 词：双组分凝胶 超分子材料 取代芳香羧酸 自组装 剪切触变性 

分 类 号：O648[理学—物理化学]