直写成型制备PVDF薄膜的电学性能  

Electrical properties of PVDF films fabricated by direct ink writing

作　　者：杨红 赵连仲 张妍 罗行 王日初 张斗 王小锋 YANG Hong;ZHAO Lian-zhong;ZHANG Yan;LUO Hang;WANG Ri-chu;ZHANG Dou;WANG Xiao-feng(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy(Central South University),Changsha 410083,China)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]State Key Laboratory of Powder Metallurgy(Central South University),Changsha 410083,China

出　　处：《Journal of Central South University》2023年第5期1477-1489,共13页中南大学学报（英文版）

基　　金：Project(2020JJ4729)supported by the Natural Science Foundation of Hunan Province,China。

摘　　要：本文采用直写成型(DIW)制备聚偏二氟乙烯(PVDF)薄膜。研究了打印墨水的流变性能,并通过SEM、FTIR、DSC、介电性能、铁电性能和压电性能测试,系统研究了工艺参数对材料性能的影响。结果表明,采用打印针头规格为27G,打印速度为20 mm/s的打印参数制备的薄膜,其有效β相含量为52.38%,相比于溶液流延法制备的薄膜提升了51.47%,高β相含量改善了薄膜的电学性能。这主要归因于打印针头处产生的牵伸力以及挤出时产生的剪切力对PVDF分子链的定向作用。在手指敲击测试中,随手指距离传感器高度的增加,响应的压电输出电压近似线性增加,制备的传感器具有78 mV/N的灵敏度,这与采用传统溶液铸造并电极化处理的薄膜性能相当。说明本实验制备的无极化传感器,在微小形变监测中具有应用潜力。In this study,direct ink writing(DIW)was applied to preparing polyvinylidene fluoride(PVDF)film.The rheological properties of inks were studied,and the influence of process parameters on material properties was systematically investigated by SEM,FTIR,DSC,dielectric,ferroelectric and piezoelectric properties testing.The results show that effectiveβ-phase content of PVDF film prepared by printing parameters with printing needle size of 27G and printing speed of 20 mm/s was 52.38%,which was improved by 51.47%compared with the film prepared by solution casting.The highβ-phase content improved the electrical properties of film.This is attributed to the orientation of PVDF molecular chains by the drawing force generated at printing needle and the shear force generated during extrusion.The piezoelectric output voltage increases approximately linearly with increasing finger height from the sensor.The sensitivity of the sensor is 78 mV/N,which is comparable to the performance of one prepared by solution casting and treated with electric polarization.The excellent piezoelectric performance of PVDF film demonstrates application potential in small deformation monitoring.

关 键 词：PVDF薄膜 3D打印 压电器件 直写成型 电学性能 

分 类 号：TB383.2[一般工业技术—材料科学与工程]