Electrical properties of PVDF/PZT composite films prepared by direct ink writing  

直写成型制备PVDF/PZT复合薄膜的电学性能

作　　者：ZHOU Run-kai YANG Hong PENG Chao-qun WANG Ri-chu ZHANG Dou FANG Guang-qiang WANG Xiao-feng 周润恺;杨红;彭超群;王日初;张斗;房光强;王小锋(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;National Key Laboratory of Aerospace Mechanism,Institute of Aerospace System Engineering Shanghai,Shanghai 201108,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 [3]National Key Laboratory of Aerospace Mechanism,Institute of Aerospace System Engineering Shanghai,Shanghai 201108,China

出　　处：《Journal of Central South University》2025年第1期71-81,共11页中南大学学报(英文版)

基　　金：Project(22020JJ4729)supported by the Natural Science Foundation of Hunan Province,China。

摘　　要：Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated.The composite films were characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),Flourier transform infrared spectroscope(FTIR)and differential scanning calorimeter(DSC).The results show that,surface modified PZT powder(PZT@PDA)is successfully coated by polydopamine(PDA),resulting in a large number of polar groups that interact with the-CF_(2)-groups in PVDF,inducing the generation of polarβphase due to hydrogen bonding formed in the interaction.Theβphase content in composite film increases with increasing PZT@PDA content,up to 28.09%as with 5 [e-mail]@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity.Moreover,the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films.The composite film with 5 wt.%PZT@PDA possesses the highest dielectric constant(8.61)and residual polarization value(0.6803μC/cm^(2)).采用直写成型技术制备了聚偏氟乙烯/锆钛酸铅(PVDF/PZT)复合薄膜,研究了锆钛酸铅(PZT)含量对薄膜结晶行为和电学性能的影响。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和差示扫描量热仪(DSC)对薄膜进行了表征。结果表明,经表面改性后的PZT粉末(PZT@PDA)成功被聚多巴胺(PDA)包覆,形成的大量极性基团与PVDF中的—CF_(2)—基团之间形成氢键,因而诱导了薄膜内β极性相的生成。该β相含量随着PZT@PDA含量的增加而增加。5 wt.%PZT@PDA复合薄膜的β相含量最高,为28.09%。PZT@PDA作为成核剂促进了复合薄膜中极性相的生成,同时也作为杂质阻碍晶核的生长,从而降低结晶度。此外,界面处PZT@PDA的存在为界面极化效应的发生提供了更多位点,从而改善薄膜的电学性能。5 wt.%PZT@PDA复合薄膜的介电常数(8.61)和残余极化值(0.6803μC/cm^(2))均最高。

关 键 词：polyvinylidene fluoride(PVDF) lead zirconate titanate(PZT) direct ink writing crystallization behaviour electrical properties 

分 类 号：TB383.2[一般工业技术—材料科学与工程]