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. 2019 May 29;20:257. doi: 10.1186/s12891-019-2644-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Evaluation of the physiochemical properties of the hydrogel of different PVA/CS ratios in the control and experimental groups. a Gross examination of PVA/CS composite hydrogel pieces of various thickness. b The WC of the hydrogel of varying PVA/CS ratios. c The SR of the hydrogel of varying PVA/CS ratios. d DSC curve of the hydrogel of varying PVA/CS ratios. e IR spectrum of pure PVA and CS. f IR spectrum of blends of PVA and CS of varying PVA/CS ratios