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. 2018 Jan 31;8:1963. doi: 10.1038/s41598-018-20385-2

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© The Author(s) 2018

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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Effects of the chemical composition of photo-curable resin on temperature responsive swelling of PNIPAAm. (a) Low temperature swelling of PNIPAAm is determined by the molar ratio of cross-linker to NIPAAm monomer. (b) High temperature shrinkage of PNIPAAm is determined by the NIPAAm concentration. Solid and dashed lines are for the samples fabricated using PμSL and a UV oven, respectively. Blue and red lines are for the swelling ratio at 10 °C and 50 °C, respectively. The photo images show the size of corresponding PNIPAAm disk samples at 10 °C and 50 °C. All scale bars indicate 1 mm.