Journal of Materials Science

, Volume 46, Issue 20, pp 6618–6626 | Cite as

Aminofunctional silane layers for improved copper–polymer interface adhesion

  • Mari HonkanenEmail author
  • Maija Hoikkanen
  • Minnamari Vippola
  • Jyrki Vuorinen
  • Toivo Lepistö


The aim of this study was to characterize two different copper grades, oxygen-free copper, and phosphorous deoxidized copper, with aminofunctional silane layers on them and to study these silane layers as coupling agents in the injection-molded thermoplastic urethane–copper hybrids. The copper surfaces were as-received and modified, i.e., polished and oxidized. The copper surfaces and silane layers which were grown from solution concentrations of 0.25 and 0.5 vol% were studied with reflection absorption infrared spectroscopy (RAIRS), atomic force microscope (AFM), scanning electron microscope (SEM), and transmission electron microscope (TEM). The adhesive strengths of the copper–polymer joints were measured with peel tests and peeled surfaces were further studied with RAIRS, AFM, and FESEM. On the as-received copper surface, the silane layer was irregular and existed mainly in the surface roughness sites. This was the reason why hybrids manufactured with the as-received copper failed mostly in the silane layer. Hybrids manufactured with the oxidized copper sheets had a uniform silane layer and the hybrids failed mostly cohesively in thermoplastic urethane and had excellent peel strength values. In all silane-treated copper samples, Si–O–Si groups were formed confirming the cross-linking in the silane layer.


Field Emission Scanning Electron Microscope Cu2O Silane Layer Copper Surface Peel Test 



The authors thank Graduate School of Processing of Polymers and Polymer-based Multimaterials, Finnish Funding Agency for Technology and Innovation, and Finnish industry for financial support.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Mari Honkanen
    • 1
    Email author
  • Maija Hoikkanen
    • 2
  • Minnamari Vippola
    • 1
  • Jyrki Vuorinen
    • 2
  • Toivo Lepistö
    • 1
  1. 1.Laboratory of Materials Characterization, Department of Materials ScienceTampere University of TechnologyTampereFinland
  2. 2.Laboratory of Plastic and Elastomer Technology, Department of Materials ScienceTampere University of TechnologyTampereFinland

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