Polyimide–Epoxy Composites with Superior Bendable Properties for Application in Flexible Electronics

Sangyoup Lee, Taewon Yoo, Youngyu Han, Hanglim Kim, Haksoo Han

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The need for flexible electronics with outstanding bending properties is increasing due to the demand for wearable devices and next-generation flexible or rollable smartphones. In addition, the requirements for flexible or rigid–flexible electronics are sharply increasing to achieve the design of space-saving electronic devices. In this regard, coverlay (CL) film is a key material used in the bending area of flexible electronics, albeit infrequently. Because flexible electronics undergo folding and unfolding numerous times, CL films with superior mechanical and bending properties are required so that the bending area can endure such severe stress. However, because current CL films are only used for a designated bending area in the flexible electronics panel, their highly complicated and expensive manufacturing procedure is a disadvantage. In addition, the thickness of CL films must be decreased to satisfy the ongoing requirement for increasingly thin products. However, due to the limitations of the two-layer structure of existing CL films, the manufacturing process cannot be made more cost effective by simply applying more thin film onto the board. To address this problem, we have developed liquid coverlay inks (LCIs) with superior bendable properties, in comparison with CL films, when applied onto flexible electronics using a screen-printing method. The results show that LCIs have the potential to become one of the leading candidates to replace existing CL films because of their lower cost and faster manufacturing process.

Original languageEnglish
Pages (from-to)4740-4749
Number of pages10
JournalJournal of Electronic Materials
Issue number8
Publication statusPublished - 2017 Aug 1

Bibliographical note

Funding Information:
This work was supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry, and Energy, Republic of Korea (No. 20154010200810).

Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


Dive into the research topics of 'Polyimide–Epoxy Composites with Superior Bendable Properties for Application in Flexible Electronics'. Together they form a unique fingerprint.

Cite this