Yang Lei, Liu Xuyang, Lu Zhouxun, Song Tong, Yang Zhihong, Xu Jianmei, Zhou Wei, Cao Xingzhong, Yu Runsheng, Wang Qing
Faculty of Materials Science and Chemistry, China University of Geosciences Wuhan 430078 China
Zhejiang Institute, China University of Geosciences Hangzhou 311305 China.
RSC Adv. 2022 Aug 31;12(38):24734-24742. doi: 10.1039/d2ra04480c. eCollection 2022 Aug 30.
The free volume effects on the dielectric properties of the polymer are ambiguous, and the quantitative effect of free volume on the dielectric properties has rarely been systematically studied, especially in the high-elastic state dipolar (HESD) polymer. In this work, the free volume of dipolar poly(vinylidene fluoride) (PVDF) is regulated by the addition of AlO, which greatly increase the size of free volume holes. Then the effect of free volume on the dielectric properties of PVDF/AlO composites is discussed. The greatly enlarged size of free volume holes is believed to potentially generate disparate effects on dielectric constant under different frequencies in such kinds of HESD polymer-based composites, bringing about more remarkable frequency dependence of the dielectric constant. The influence of atomic-scale microstructure based on free volume further clarifies the free volume effects on the dielectric properties and provides valuable insights for the research of dielectric behaviour of polymer composites, which is constructive to design novel dielectric materials and further optimize the dielectric properties of dipolar dielectric polymer composites.
自由体积对聚合物介电性能的影响尚不明确，且自由体积对介电性能的定量影响很少得到系统研究，尤其是在高弹性态偶极（HESD）聚合物中。在本工作中，通过添加AlO来调节偶极聚偏氟乙烯（PVDF）的自由体积，这极大地增加了自由体积孔的尺寸。然后讨论了自由体积对PVDF/AlO复合材料介电性能的影响。在这类基于HESD聚合物的复合材料中，自由体积孔尺寸的大幅增大被认为可能在不同频率下对介电常数产生不同影响，导致介电常数具有更显著的频率依赖性。基于自由体积的原子尺度微观结构的影响进一步阐明了自由体积对介电性能的作用，并为聚合物复合材料介电行为的研究提供了有价值的见解，这对设计新型介电材料以及进一步优化偶极介电聚合物复合材料的介电性能具有建设性意义。
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