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Proton-conductive materials formed by coumarin photocrosslinked ionic liquid crystal dendrimers†
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1039/c7tc05009g
Alberto Concellón 1, 2, 3, 4, 5 , Ting Liang 6, 7, 8, 9, 10 , Albertus P. H. J. Schenning 6, 7, 8, 9, 10 , José Luis Serrano 2, 4, 5, 11, 12 , Pilar Romero 1, 2, 3, 4, 5 , Mercedes Marcos 1, 2, 3, 4, 5
Affiliation  

In this work, we have successfully examined for the first time the use of ionic dendrimers as building blocks for the preparation of 1D and 2D proton conductive materials. For this purpose, a new family of liquid crystalline dendrimers has been synthesized by ionic self-assembly of poly(amidoamine) (PAMAM) dendrimers bearing 4, 8, 16, 32 or 64 NH2 terminal groups and a coumarin-containing bifunctional dendron. The noncovalent architectures were obtained by the formation of ionic salts between the carboxylic acid group of the dendron and the terminal amine groups of the PAMAM dendrimer. The liquid crystal properties have been investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). All the compounds exhibited mesogenic behavior with smectic A or hexagonal columnar mesophases depending on the generation of the dendrimer. Coumarin photodimerization was used as a crosslinking reaction to obtain liquid crystalline polymer networks. All the materials showed good proton conductive properties as the LC arrangement leads to the presence of ionic nanosegregated areas (formed by the ion pairs) that favor proton conduction.

中文翻译:

香豆素光交联的离子型液晶树状聚合物形成的质子传导材料

在这项工作中,我们首次成功地检查了离子树状聚合物作为制备1D和2D质子传导材料的基础材料的用途。为了这个目的,已经通过带有4、8、16、32或64个NH 2的聚(酰胺胺)(PAMAM)树状聚合物的离子自组装合成了新的液晶树状聚合物家族。末端基团和含有香豆素的双功能树突。非共价结构是通过在树枝状分子的羧酸基团与PAMAM树枝状大分子的末端胺基团之间形成离子盐获得的。通过偏振光学显微镜(POM),差示扫描量热法(DSC)和X射线衍射(XRD)研究了液晶性质。根据树状聚合物的生成,所有化合物均表现出与近晶A或六边形柱状中间相的介晶行为。将香豆素光二聚化用作交联反应以获得液晶聚合物网络。所有材料均显示出良好的质子传导性能,因为LC排列导致存在有利于质子传导的离子纳米隔离区域(由离子对形成)。
更新日期:2017-12-21
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