Nanoindentation-induced delamination of submicron polymeric coatings

Kebin Geng, Fuqian Yang, Thad Druffel, Eric A. Grulke

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


An elastic model is developed to estimate the interfacial strength between a submicron surface coating and a compliant substrate. The analysis uses a shear-lag model and assumes the plane-stress state in the surface coating. The critical indentation load for the indentation-induced delamination of the coating from the substrate increases with the third power of the indentation depth and is a linear function of the reciprocal of the coating thickness. The indentation-induced delamination of SR399 ultrathin surface coatings over acrylic substrate has been evaluated, using the nanonindentation technique for coating thicknesses of 47, 125, 220 and 3000 nm. For the submicron coatings, the dependence of the critical indentation load on the coating thickness supports the elastic model. The interfacial strength is found to be 46.9 MPa. In contrast, the polymeric coating of 3000 nm displays multiple "excursions" in the loading curve, and the critical indentation load is a linear function of the indentation depth.

Original languageEnglish
Pages (from-to)841-848
Number of pages8
Issue number3
StatePublished - Jan 26 2007

Bibliographical note

Funding Information:
FY is grateful for support from NSF grant CMS-0508989 and from General Motors Corporation. KG and EG are grateful for support from Optical Dynamic Corporation.


  • Interfacial strength
  • Nanoindentation
  • Ultrathin polymeric coating

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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