Polymer dielectrics essentially revolutionized the electrical power system, pervasively used in nearly all the key electronic and electrical devices, due mainly to their suitably large bandgaps. However, insufficient attention has been paid to the bandgap in the design of new polymer dielectrics for high temperatures. In this paper, we present a unified principle for the design of flexible, high temperature polymer dielectrics. As exemplified by our recently discovered poly(oxa)norbornenes (POFNB), saturated bicyclics with varying carbonyl and ether groups in the bicyclic repeat units, connected by unconjugated alkenes and freely rotatable single bonds in conjunction with freely rotating fluorinated benzene ring side-groups, can impart flexibility yet retain thermal stability while providing large bandgaps to olefinic polymers. The results indicate that POFNB has stably low conduction current under concurrent high electric field and elevated temperatures beneficial from its large band gap of ∼5 eV and high glass transition temperature of 186 °C.

中文翻译：

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用于新兴大电气化的柔性高温聚合物电介质设计的评论——以聚（氧杂）降冰片烯为例

聚合物电介质从根本上彻底改变了电力系统，主要由于其适当的大带隙，几乎普遍用于所有关键的电子和电气设备。然而，在设计用于高温的新型聚合物电介质时，对带隙的关注不够。在本文中，我们提出了设计柔性高温聚合物电介质的统一原则。正如我们最近发现的聚（氧杂）降冰片烯 (POFNB) 所示，饱和双环在双环重复单元中具有不同的羰基和醚基团，通过非共轭烯烃和可自由旋转的单键与自由旋转的氟化苯环侧基相连，可以赋予柔韧性，同时保持热稳定性，同时为烯烃聚合物提供大的带隙。