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. 2017 May 19;21:7. doi: 10.1186/s40824-017-0093-7

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© The Author(s). 2017

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. 2 — SEM micrographs of a fracture surface of a 20%PEEK/80%CS specimen prepared at a P:L ratio of 0.85 g/mL (a) prior to heat treatment and (b) after heat treatment. (c) FT-IR spectra between 500 cm⁻¹ and 4000 cm⁻¹ wavenumbers of PEEK and CSH (CaSO₄.0.5H₂O) starting powders, and a powdered 20%PEEK/80%CS specimen after heat treatment