摘要
目前有机薄膜电容器中的介质材料多为线性电介质,这类聚合物的介电常数通常较低,造成电容器储能密度普遍偏低,而新型高储能聚合物介质材料一般又存在介质损耗高的问题。聚甲基丙烯酸甲酯(PMMA)与高储能含氟聚合物的相容性较好,常被用来改善后者的力学和击穿性能,但市售的PMMA存在本征介质损耗过高的问题。为了降低PMMA的介质损耗,本文用甲基丙烯酸甲酯(MMA)与苯乙烯(St)合成MMA-St共聚物(MS),将不同比例的MS掺入本体聚合的PMMA中形成复合体系,并研究复合体系的介电特性、储能特性及绝缘特性。结果表明:该复合体系可以显著降低PMMA的介质损耗,相较于PMMA更适合作为高储能聚合物的改性材料。其中复合10%MS的介质膜在5 500 kV/cm电场下获得了5 J/cm^(3)的放电能量密度,充放电效率达到83%。
Currently,the dielectric of plastic film capacitors is usually linear dielectric polymers with a low dielectric constant,leading to a relatively low energy storage density of capacitors.High-energy-density dielectric polymers under research often suffer from excessive dielectric loss,limiting their practical utilization.Poly(methyl methacrylate)(PMMA)has been commonly employed to enhance the mechanical and breakdown properties of high-energy-density fluoropolymer beceause of their good compatibility between them.However,the commercially available PMMA also exhibits too high intrinsic dielectric loss.In order to decrease the dielectric loss of PMMA,a copolymer named MS was synthesized from methyl methacrylate(MMA)and styrene(St).Subsequently,a series of composites were fabricated by incorporating low content of MS into bulk polymerized PMMA,and their dielectric properties,energy storage characteristics,and insulating peoperties were investigated.The results show that the composites can significantly reduce the dielectric loss of PMMA,making it more suitable as the modified material of high-energy-density polymer compared to PMMA.Under 5500 kV/cm of electric field,the discharge energy density of the dielectric film composed of 10%MS achieves 5 J/cm^(3),and its charge-discharge efficiency can attain 83%.
作者
蔡博
赵月涛
孟祥硕
周榆久
王礼坤
叶虎
潘齐凤
徐建华
CAI Bo;ZHAO Yuetao;MENG Xiangshuo;ZHOU Yujiu;WANG Likun;YE Hu;PAN Qifeng;XU Jianhua(Ocean College,Jiangsu University of Science and Technology,Zhenjiang 212003,China;China Zhenhua(Group)Xinyun Electronic Components and Development Company Limited,Guiyang 550018,China;School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China)
出处
《绝缘材料》
CAS
北大核心
2024年第4期22-27,共6页
Insulating Materials
基金
国家自然科学基金青年科学基金资助项目(62201231)
中国博士后科学基金面项目(2022MD713827)
江苏省产学研合作项目(BY2022711)。
关键词
聚甲基丙烯酸甲酯
介质损耗
储能
全有机复合介质膜
polymethyl methacrylate
dielectric loss
energy storage
all-organic composite dielectric film
