Abstract
Statistical fractal characteristics are examined for polymer-based interfaces. Interfacial fracture behavior is modulated via exposure to varying levels of chemical contaminant concentration so as not to affect the initial interface roughness. The results of 1D height–height correlation analysis show a strong correlation between the interfacial fracture toughness and the resulting fracture surface roughness, and a toughness-independent roughness exponent; \(\beta \approx\) 0.35 ± 0.04, which is the slope of the self-affine domain. The cut-off length scale of the self-affinity is found to scale with interface toughness, and equal the combined length scales of interfacial cohesive length and plastic zone size within the adhesive layer. The reported statistical characteristics of interfacial fracture surfaces is among the first to show the quantitative inter-correlation between interfacial adhesion and the resulting fracture surface roughness. With additional examination of other systems, the observed correlations have the potential to assess the interfacial fracture toughness for a wide range of polymer-based interfaces.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
This work was supported by National Science Foundation under contract No. DMR-1807545, and by the Office of Naval Research (ONR) under Contract No. 104728. The authors would also like to acknowledge Redwood Scientific, Inc. on grades of contamination. Special thanks to an anonymous reviewer who has greatly helped in integrating the presentation of the paper.
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Yavas, D., Bastawros, A.F. Correlating interfacial fracture toughness to surface roughness in polymer-based interfaces. Journal of Materials Research 36, 2779–2791 (2021). https://doi.org/10.1557/s43578-021-00218-1
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DOI: https://doi.org/10.1557/s43578-021-00218-1