Freeze-drying and hot-pressing strategy to embed two-dimensional Ti_(0.87)O_(2) monolayers in commercial polypropylene films with enhanced dielectric properties  

作　　者：Wenchao Tian Fei Yan Cailing Cai Zeyi Wu Chenchen Zhang Ting Yin Sijia Lao Linfeng Hu 

机构地区：[1]Department of Materials Science,Fudan University,Shanghai,200433,China [2]State Grid Anhui Electric Power Institute,Hefei,230022,China [3]China Electric Power Research Institute,Beijing,100192,China

出　　处：《Journal of Advanced Ceramics》2021年第2期368-376,共9页先进陶瓷（英文）

基　　金：financially supported by the Researching Program of State Grid Corporation of China(GYW17201800011):Research and Application of Key Technologies to Improve the Performance of Film Insulator for High Voltage Capacitive Equipment。

摘　　要：The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging–discharging and ultrahigh power density.Nevertheless,its energy density is still limited by the low dielectric constant(≈2.2)of the commercial dielectric polypropylene(PP).The conventional enhancement strategy by embedding inorganic fillers in PP matrix is still difficult and challenging due to that PP hardly dissolves in any inorganic/organic solvent.In this work,we develop a new strategy including freeze-drying,surface functionalization,and hot-pressing to incorporate Ti_(0.87)O_(2) monolayers in PP film.A series of uniform composited Ti_(0.87)O_(2)@PP film has been successfully fabricated with Ti0.87O2 content range of 0–15 wt%.The maximum dielectric constant of the as-prepared Ti_(0.87)O_(2)@PP film is 3.27 when the Ti_(0.87)O_(2) content is 9 wt%,which is about 1.5 times higher than that of pure PP.Our study provides a feasible strategy to embed two-dimensional material into commercial PP thin-film with superior dielectric performance for practical application.

关 键 词：Ti_(0.87)O_(2)nanosheets polypropylene(PP) FREEZE-DRYING surface functionalization HOT-PRESSING dielectric constant 

分 类 号：TM53[电气工程—电器] TB383.2[一般工业技术—材料科学与工程]