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Interfacial Effect on Dielectric Properties of Self-Assembled Polythiourea-Based Copolymers for Ultrahigh Energy Storage
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2021-12-01 , DOI: 10.1002/marc.202100700 Yang Feng 1 , Liuhao Jiang 1 , Anqi Yang 1 , Xia Liu 1 , Liuqing Yang 1 , Guanghao Lu 1 , Shengtao Li 1
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2021-12-01 , DOI: 10.1002/marc.202100700 Yang Feng 1 , Liuhao Jiang 1 , Anqi Yang 1 , Xia Liu 1 , Liuqing Yang 1 , Guanghao Lu 1 , Shengtao Li 1
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Polymer dielectrics are highly desirable in capacitor applications due to their low cost, high stability, and reliability. However, there still remains a lack of feasible methods to prepare polymer dielectrics with high energy density and low dielectric loss, which severely hampers the development of compact and efficient power electronics. Here, an amphiphilic block copolymer, polythiourea-b-polydimethylsiloxane (PTU-b-PDMS), with an extraordinarily high energy density of 29.8 J cm−3 and a low loss is synthesized via polyaddition polymerization. This is highly relevant to the block molecule conformation in the interfacial region of the self-assembled PTU-b-PDMS. The block molecule in the interface adopts an extended conformation when the PTU forms nanodots, whereas the block molecule adopts a coiled conformation when the PTU forms nanostrands. The observation and characterization have proved that the coiled block molecule in the interfacial region can simultaneously induce extra strong charge trapping sites and dipolar polarization. It substantially improves the breakdown strength from 652 to 1166 MV m−1, while maintaining a high dielectric constant of 5 and a low loss of <0.01. This work offers unprecedented structural insights into the conformation-induced interfacial effect and enables rational design of self-assembled copolymers to boost their dielectric properties and energy density.
中文翻译：
界面效应对超高储能自组装聚硫脲基共聚物介电性能的影响
聚合物电介质因其低成本、高稳定性和可靠性而在电容器应用中非常受欢迎。然而，目前仍缺乏可行的方法来制备高能量密度和低介电损耗的聚合物电介质，这严重阻碍了紧凑高效电力电子器件的发展。在这里，通过加聚聚合合成了具有29.8 J cm -3的极高能量密度和低损耗的两亲嵌段共聚物聚硫脲- b -聚二甲基硅氧烷 (PTU- b -PDMS)。这与自组装 PTU- b界面区域的嵌段分子构象高度相关-PDMS。当PTU形成纳米点时，界面中的嵌段分子采用扩展构象，而当PTU形成纳米链时，界面中的嵌段分子采用卷曲构象。观察和表征证明，界面区盘绕的嵌段分子可以同时诱导超强的电荷俘获位点和偶极极化。它显着提高了从 652 到 1166 MV m -1的击穿强度，同时保持了 5 的高介电常数和 <0.01 的低损耗。这项工作为构象诱导的界面效应提供了前所未有的结构见解，并使自组装共聚物的合理设计能够提高其介电性能和能量密度。
更新日期：2021-12-01
中文翻译：
界面效应对超高储能自组装聚硫脲基共聚物介电性能的影响
聚合物电介质因其低成本、高稳定性和可靠性而在电容器应用中非常受欢迎。然而，目前仍缺乏可行的方法来制备高能量密度和低介电损耗的聚合物电介质，这严重阻碍了紧凑高效电力电子器件的发展。在这里，通过加聚聚合合成了具有29.8 J cm -3的极高能量密度和低损耗的两亲嵌段共聚物聚硫脲- b -聚二甲基硅氧烷 (PTU- b -PDMS)。这与自组装 PTU- b界面区域的嵌段分子构象高度相关-PDMS。当PTU形成纳米点时，界面中的嵌段分子采用扩展构象，而当PTU形成纳米链时，界面中的嵌段分子采用卷曲构象。观察和表征证明，界面区盘绕的嵌段分子可以同时诱导超强的电荷俘获位点和偶极极化。它显着提高了从 652 到 1166 MV m -1的击穿强度，同时保持了 5 的高介电常数和 <0.01 的低损耗。这项工作为构象诱导的界面效应提供了前所未有的结构见解，并使自组装共聚物的合理设计能够提高其介电性能和能量密度。
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