Abstract：
Polymer dielectrics with high energy density are of urgent demand in electric and electronic devices, but the tradeoff between dielectric constant and breakdown strength is still unsolved. Herein, the synthesis and molar mass control of three alternating [1.1.1]propellane-(meth)acrylate copolymers, denoted as P-MA, P-MMA, and P-EA, respectively, are reported. These copolymers exhibit high thermal stability and are semi-crystalline with varied glass transition temperatures and melting temperatures. The rigid bicyclo[1.1.1]pentane units in the polymer backbone promote the orientational polarization of the polar ester groups, thus enhancing the dielectric constants of these polymers, which are 4.50 for P-EA, 4.55 for P-MA, and 5.11 for P-MMA at 10 Hz and room temperature, respectively. Moreover, the high breakdown strength is ensured by the non-conjugated nature of bicyclo[1.1.1]pentane unit. As a result, these copolymers show extraordinary energy storage performance; P-MA exhibits a discharge energy density of 9.73 J cm-3 at 750 MV m-1 and ambient temperature. This work provides a new type of promising candidates as polymer dielectrics for film capacitors, and offers an efficient strategy to improve the dielectric and energy storage properties by introducing rigid non-conjugated bicyclo[1.1.1]pentane unit into the polymer backbone.
摘要：
具有高能量密度的聚合物电介质在电气和电子器件中具有迫切的需求,但介电常数和击穿强度之间的权衡仍未解决。在这里，我们报告了三种交替的[1.1.1]推进剂-（甲基）丙烯酸酯共聚物的合成和摩尔质量控制，表示为P-MA，P-MMA,和P-EA,分别。这些共聚物表现出高的热稳定性并且是具有变化的玻璃化转变温度和熔融温度的半结晶。聚合物骨架中的刚性双环[1.1.1]戊烷单元促进极性酯基的取向极化,从而提高这些聚合物的介电常数，P-EA为4.50，4.55对于P-MA，和5.11的P-MMA在10Hz和室温下，分别。此外，双环[1.1.1]戊烷单元的非共轭性质确保了高击穿强度。因此,这些共聚物表现出非凡的能量储存性能;P-MA在750MV/m和环境温度下表现出9.73J/cm3的放电能量密度。这项工作提供了一种新型的有前途的候选薄膜电容器的聚合物电介质，并通过在聚合物主链中引入刚性非共轭双环[1.1.1]戊烷单元来提供改善介电和储能性能的有效策略。本文受版权保护。保留所有权利。
