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. 2020 Oct 12;10:17048. doi: 10.1038/s41598-020-73863-x

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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SEM images of both sides (top and bottom) of PCL membranes prepared by addition of different amount of PEG. PEG/PCL w/w ratio is 0 (A), 1:5 (B), 2:5 (C), 1:1 (D) and 3:2 (E). Only the ratio of 3:2 PEG/PCL formed pores in both sides, which is selected to be used as the Film in the knee plug. The average size of the formed pores in the Film is 10 µm.