材料科学
电介质
聚合物
乳酸
可生物降解聚合物
电容器
生物降解
储能
化学工程
复合材料
有机化学
光电子学
功率(物理)
电压
电气工程
化学
物理
量子力学
生物
细菌
遗传学
工程类
作者
Xu Fan,Weijun Miao,Zhicheng Li,Hao Wang,Xiangping Ding,Yu Cheng,Jinjun Liu,Jinhong Yu,Zhongbin Pan
摘要
Poly(lactic acid)-based (PLA) films with biodegradability and ease of processing are promising dielectrics for application in electrostatic capacitors. Nevertheless, the relative low energy storage capability of the PLA film greatly hampers the development of its further application. Herein, a biodegradable polymer of stereocomplex crystals of poly(lactic acid) is prepared utilizing a solution blending method of the co-blended poly-L-lactic acid (PLLA) and poly-D-lactic acid (PDLA) in a 1:1 ratio. The stereocomplex crystals could prominently improve insulation and mechanical properties of PLLA/PDLA blend films, thus achieving an outstanding energy density (Ud ∼ 13.7 J/cm3) accompanied with high efficiency (η ∼ 92.8%) at a breakdown electric field of 750 MV/m. Additionally, the PLLA/PDLA blend film also exhibit good high-temperature performance and reliability. This work provides a reasonable tailoring strategy for biodegradable polymer dielectrics and demonstrates a great potential of biodegradable polymers for practical applications in environmentally friendly power electronics and electrical systems.
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