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2020 Vol.30, Issue 3
Failure Mechanism of Cu/PET Flexible Composite Film with Anisotropic Interface Nanostructure
Sang Jin Park
,
Jun Hyun Han†
Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
†Corresponding author E-Mail : jhhan@cnu.ac.kr (J. H. Han, Chungnam Nat’l Univ.)
March 2020. pp. 105-110
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Abstract

Cu/PET composite films are widely used in a variety of wearable electronics. Lifetime of the electronics is determined by adhesion between the Cu film and the PET substrate. The formation of an anisotropic nanostructure on the PET surface by surface modification can enhance Cu/PET interfacial adhesion. The shape and size of the anisotropic nanostructures of the PET surface can be controlled by varying the surface modification conditions. In this work, the effect of Cu/PET interface nanostructures on the failure mechanism of a Cu/PET flexible composite film is studied. From observation of the morphologies of the anisotropic nanostructures on plasma-treated PET surfaces, and cross-sections and surfaces of the fractured specimens, the Cu/PET interface area and nanostructure width are analyzed and the failure mechanism of the Cu/PET film is investigated. It is found that the failure mechanism of the Cu/PET flexible composite film depends on the shape and size of the plasmatreated PET surface nanostructures. Cu/PET interface nanostructures with maximal peel strength exhibit multiple craze-crack propagation behavior, while smaller or larger interface nanostructures exhibit single-path craze-crack propagation behavior.

Keywords
Cu/PET
interface nanostructure
adhesion
failure
craze-crack
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 30
  • No :3
  • Pages :105-110
  • Received Date : 2020-01-11
  • Revised Date : 2020-02-11
  • Accepted Date : 2020-02-12
  • DOI :https://doi.org/10.3740/MRSK.2020.30.3.105
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