A series of formic acid MOFs/polylactic acid blending composites with the improved dielectric performance in Co(Ⅱ)systems  

作　　者：Zhuting Hao Danhong Yang Zhicheng Zhang Qin-Xiang Jia Wen Zhang 

机构地区：[1]School of Chemistry Xi’an Jiaotong University No.28,Xianning West Road,Xi’an 710049,Shaanxi,P.R.China [2]School of Mechanical Engineering Xi’an Jiaotong University No.28,Xianning West Road,Xi’an 710049,Shaanxi,P.R.China

出　　处：《Journal of Advanced Dielectrics》2024年第4期2-19,共18页先进电介质学报（英文）

基　　金：financial support from the Natural Science Foundation of Shaanxi Province(Grant Nos.2023-JCYB-125 and 2019JM-242);the Key Research and Development projects in Shaanxi Province(2021GXLH-Z-074).

摘　　要：In order to improve the limited compatibility of existing polymer/ceramic dielectric composites and further enhance the energy storage density,MOF/polymer composite dielectrics have been explored,which exhibit good compatibility to the polymer matrix from abundant organic groups of the inorganic–organic hybrid metal-organic framework(MOF)fillers.However,they still lack a clear composition–structure–property rule,and the precise design of MOF fillers and polymer matrix becomes a prominent problem in these composites due to the diversity of the metal ions and the organic groups.Thus,in this paper,we present a series of formic acid MOFs/polylactic acid dielectric composites in which ferroelectric formic acid MOFs,namely PDLLA/[NH_(3)(CH_(2))_(4)NH_(3)][M^(Ⅱ)(HCOO)_(3)]_(2)and PDLLA/[CH_(3)NH_(3)][M^(Ⅱ)(HCOO)_(3)]_(2),in which the formic acid MOFs are with different structures and different metal ions as fillers,including[NH_(3)(CH_(2)T_(4)NH_(3))][M^(Ⅱ)(HCOO)_(3)]_(2)(namely MOF–Co(M=Co),MOF–Mg(M=Mg),MOF–Mn(M=Mn),with 1,4-butanediamine ion as guest)and[CH_(3)NH_(3)][M^(Ⅱ)(HCOO)_(3)]_(2)(namely MOF–Co_(2)(M=Co),MOF–Ni_(2)(Ni),with methylamine ion as guest).The composition and morphology of composite films were characterized by XRD,IR,SEM,DSC and UV,respectively,while the dielectric characterizations of the composites including the dielectric permittivity,the dielectric loss,the breakdown field strength and the energy density were also performed.The composition–structure–property relationships were also investigated including the influence of MOF content and MOF category.With the introduction of MOFs,the dielectric constant of the polylactic acid substrate was improved slightly while the breakdown field strength can be improved in some systems.Interestingly,the Co(Ⅱ)-containing formic acid MOF has advantages over other formic acid MOFs with similar structure for the enhancement of the dielectric constant and breakdown field strength.Also,in some composite films with methylamine ion guest

关 键 词：Dielectrics MOF/polymer composite energy storage density PERMITTIVITY breakdown field strength 

分 类 号：TM21[一般工业技术—材料科学与工程]