悬浮液流变行为对涂层电极成型的影响  

Influence of Rheological Behavior of Suspensions on Forming Process of Coated Electrodes

作　　者：明皓 关银燕 刘诗月 高瑛俊 高维春 田雪咏 梁吉艳 Hao Ming;Yinyan Guan;Shiyue Liu;Yingjun Gao;Weichun Gao;Xueyong Tian;Jiyan Liang(School of Environmental and Chemical Engineering,Shenyang University of Technology,Shenyang 110870,China;Department of Environmental and Biological Engineering,Shenyang Institute of Science and Technology,Shenyang 110167,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳科技学院环境与生物工程系,辽宁沈阳110167

出　　处：《高分子材料科学与工程》2023年第4期110-114,共5页Polymer Materials Science & Engineering

基　　金：辽宁省“兴辽英才计划”(XLYC1908034,XLYC2007170);辽宁省“百千万人才工程”资助项目(2018921006);辽宁省教育厅科学研究经费项目(20201362101,LQGD2020014)。

摘　　要：为探究电容去离子电极涂覆成型过程中各组分间的相互作用和微观结构,采用流变学分析手段考察了聚合物黏结剂分子链构型对电极结构的影响,建立通过流动状态识别微观结构的机制,以引导电极成型。结果表明,聚合物链结构显著影响悬浮液流变性质和涂层状态。2种聚合物均可与粒子形成物理交联网络;对于直链聚乙烯醇(PVA),链末端较少,网络的形成依靠桥接絮凝,因此黏度调控窗口较宽,分子内及分子间氢键作用使涂层坚硬,弹性低;而支化的聚乙烯亚胺(PEI),具有丰富的末端基团,与粒子作用所形成物理网络交联密度高,因此悬浮液剪切变稀显著,低分子量时涂层脆易开裂。基于此,提出了涂层电极黏结剂和成型条件选择的流变学方法。In order to investigate the microstructure and interactions between the components in coating process of capacitive deionization electrode,linear and branched polymer binders were used to research the influence on the surface morphology of coated electrode through rheological behavior analysis.Based on this,connect the flow behavior and microstructure to guide the molding process of electrode.Results show that chain structure plays an important role on rheological property and morphology.For linear polyvinyl alcohol(PVA),less chain end crosslinked networks were formed by bridging flocculation between polymer and particles,leading a wider processing window.And the electrode film is firm and nonelastic cause of hydrogen bond.While for branched polyethyleneimine(PEI),abundant end groups form highly crosslinked networks,leading a significant shear thinning.And the electrode is brittle and easy cracking.Based on the above analysis,a rheological method for binder selection and operation of coating was proposed.

关 键 词：涂层电极 涂覆 流变行为 链结构 黏结剂 

分 类 号：TQ430.7[化学工程]