Impact of oxygen-containing carbonyl and ether groups on dielectric properties of poly(oxa)norbornene cyclic olefins  

作　　者：Chao Wu Ajinkya A.Deshmukh Lihua Chen Rampi Ramprasad Gregory A.Sotzing Yang Cao 

机构地区：[1]Institute of Materials Science,University of Connecticut Storrs,CT 06269,USA [2]School of Materials Science and Engineering,Georgia Institute of Technology Atlanta,GA 30332,USA [3]Department of Electrical and Computer Engineering,University of Connecticut Storrs,CT 06269,USA

出　　处：《Journal of Advanced Dielectrics》2023年第4期65-68,共4页先进电介质学报（英文）

基　　金：supported by the Office of Naval Research through a multidisciplinary university research initiative(MURI)grant(N00014-17-1-2656);a capacitor program grant(N00014-19-1-2340)。

摘　　要：Flexible dielectric polymers that can withstand high electric field and simultaneously have high dielectric constant are desired for high-density energy storage.Here,we systematically investigated the impact of oxygen-containing ether and carbonyl groups in the backbone structure on dielectric properties of a series of cyclic olefin.In comparison to the influence of the-CF3 pendant groups that had more impact on the dielectric constant rather than the band gap,the change of the backbone structure affected both the dielectric constant and band gaps.The one polymer with ether and carbonyl groups in the backbone has the largest band gap and highest discharge efficiency,while it has the lowest dielectric constant.The polymer without any ether groups in the backbone has the smallest band gap and lowest discharge efficiency,but it has the highest dielectric constant.Polymers that have no dipolar relaxation exhibit an inversely correlated dielectric constant and band gap.Enhancing the dipolar relaxation through rational molecular structure design can be a novel way to break through the exclusive constraint of dielectric constant and band gap for high-density energy storage.

关 键 词：Polymer dielectric band gap glass transition conduction energy density DFT 

分 类 号：O63[理学—高分子化学]