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. 2019 Jan 24;9:504. doi: 10.1038/s41598-018-37052-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Evaluation of fracture energy and anti-hydrolysis property of the Al/PI interface. (a) Illustration showing how the interfacial fracture energy was quantitatively measured via an asymmetric double cantilever beam (ADCB) test. The right photograph showing how the ADCB test was actually conducted. (b) to (d) Initial aluminum, fracture aluminum surface, and zoom-in image of in (c). (e) to (g) Initial polyimide, fracture polyimide surface, and zoom-in image of in (f). All the fracture surfaces were taken from crack tip ahead of the blade. To enhance topographical contrasts, (c), (f) and (g) were taken at a tilt angle 30°. (h) Photograph showing the ADCB-tested specimen after the temperature humidity storage (85 °C/85RH%) for 1000 h. The blade was inserted from the upper edge of the specimen down into the interface.

Inline graphic — Evaluation of fracture energy and anti-hydrolysis property of the Al/PI interface. (a) Illustration showing how the interfacial fracture energy was quantitatively measured via an asymmetric double cantilever beam (ADCB) test. The right photograph showing how the ADCB test was actually conducted. (b) to (d) Initial aluminum, fracture aluminum surface, and zoom-in image of in (c). (e) to (g) Initial polyimide, fracture polyimide surface, and zoom-in image of in (f). All the fracture surfaces were taken from crack tip ahead of the blade. To enhance topographical contrasts, (c), (f) and (g) were taken at a tilt angle 30°. (h) Photograph showing the ADCB-tested specimen after the temperature humidity storage (85 °C/85RH%) for 1000 h. The blade was inserted from the upper edge of the specimen down into the interface.