Journal of Materials Science

, Volume 54, Issue 7, pp 5952–5960 | Cite as

Sandwich-type porous polyimide film with improved dielectric, water resistance and mechanical properties

  • Le Xu
  • Yingyi MaEmail author
  • Junwen Xie
  • Wenlong ZhangEmail author
  • Zijian Wu
  • Zhenfeng He


The simultaneous improvement of dielectric, mechanical and water resistance properties of dielectric materials is extremely important for their practical use, but rarely been realized. Here, the comprehensive properties of polyimide (PI) film were enhanced through the construction of sandwich-type porous film using the microemulsion method. Due to the introduction of porous structure on both sides of PI film, apparent decreases were observed in dielectric constant (16.50%) and water absorption (82.7%), accompanied by increases in tensile strength (5.14%) and tensile modulus (41.17%), compared to flat PI film. Furthermore, excellent durability of low dielectric constant of the sandwich-type porous film under moist environment was demonstrated since 1.76% of increase was found upon exposing to 75% R.H. for 32 h. This provides a novel method to optimize the comprehensive properties of dielectric materials and also displays underlying insight for the development of functional materials in electronic and electric areas.



The authors acknowledge the financial support from National Natural Science Foundation of China (21604019, 21504037), the Postdoctoral Research Fund of Heilongjiang Province (LBH-Q17079), Natural Science Foundation of Heilongjiang Province of China (QC2018011), China Postdoctoral Science Foundation (2017M610212).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringHarbin University of Science and TechnologyHarbinChina
  2. 2.School of Chemical Engineering and TechnologyNorth University of ChinaTaiyuanChina

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