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. 2016 Apr 23;8(4):162. doi: 10.3390/polym8040162

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Plot of the intensity ratio $I_{1} / I_{3}$ as a function of temperature for PNNPAM, PNIPAM and NIPMAM solutions mixed with pyrene as well as pure pyrene as reference; (b) To quantify the VPTT, the first derivative of $I_{1} / I_{3}$ with respect to temperature as a function of temperature is presented. The concentration of all microgel solutions was 0.1 wt %.