Improvement of adhesion between liquid crystalline polymer film and epoxy by cold plasma treatment

Yasuhiro Kurihara, Shinichi Yamazaki, Kunio Kimura, Hiroyuki Ohata, Masahiko Kawaguchi

Research output: Contribution to conferencePaper

Abstract

We investigated the surface modification of thermotropic liquid-crystalline polymer (LCP) film made of wholly aromatic copolyester by O2 reactive-ion-etching (RIE) and O2, N2, N 2/H2(7/3) direct-plasma (DP) to improve the adhesion and the long-term reliability of the adhesion between the LCP film and epoxy, which is typically used as bonding sheet for printed circuit boards. About the peel strength before and after Pressure Cooker Test (PCT), which was conducted to determine the long-term reliability, the peel strength before PCT was increased with decreasing pressure in O2, N2 DP, whereas the peel strength after PCT was decreased with decreasing pressure in O2 RIE and O2, N2 DP . The XPS analysis conducted on the LCP film surface treated with O2 RIE and O2 DP implied that a higher number of phenol hydroxyl groups were generated at low-pressure and the peel strength before and after PCT was affected. Moreover, it is speculated that if N functional groups are introduced by the plasma treatment of the gas containing N2, the decrease of the peel strength after PCT will become significant. The surface roughness of the film was increased with increasing pressure in O2 RIE, and it was assumed that the peel strength before and after PCT was based on the synergistic effect of functional groups and the surface roughness.

Original languageEnglish
Number of pages1
Publication statusPublished - Oct 19 2006
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: May 24 2006May 26 2006

Other

Other55th SPSJ Annual Meeting
CountryJapan
CityNagoya
Period5/24/065/26/06

Keywords

  • Adhesion
  • Cold plasma
  • Liquid crystalline polymer film
  • XPS

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Kurihara, Y., Yamazaki, S., Kimura, K., Ohata, H., & Kawaguchi, M. (2006). Improvement of adhesion between liquid crystalline polymer film and epoxy by cold plasma treatment. Paper presented at 55th SPSJ Annual Meeting, Nagoya, Japan.