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. 2017 Jun 15;7:3615. doi: 10.1038/s41598-017-03851-1

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© The Author(s) 2017

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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Characterization of vascular grafts. (A) The schematic diagram for preparation of hybrid PCL/PDS grafts. (B) The morphology of vascular grafts was evaluated by SEM and CLSM. SEM images of cross-section of PCL (I) and PCL/PDS grafts (II) showed that they had favorable tubular structure. Fluorescent images of hybrid PCL/PDS grafts with red PCL fibers labled with DiI and green PDS fibers labled with DiO (III). SEM images of lumen surface of vascular grafts (IV,V,VI) showed all the fibers had a smooth surface with well-defined fiber morphology. The average fibers diameter (C) and pore size (D) of vascular grafts was calculated based on the SEM images of grafts lumen surface. (E) Surface hydrophilic/hydrophobic performance analyzed by WCA analysis (n = 4), and the corresponding images of water droplets on the different surfaces after contact of 20 seconds. (F,G and H) The transverse mechanical properties of vascular grafts (n = 3). *p < 0.05, ^# p < 0.001.