The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS

The temperature and mechanism of phase transition of poly(N-isopropylacrylamide-co-acrylic acid) [P(NiPAAm-co-AAc)], which is one of the multi-stimuli responsive polymers, were investigated at various pHs using infrared (IR) spectroscopy, two-dimensional (2D) gradient mapping, and two-dimensional co...

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Autores principales: Park, Yeonju, Kim, Minkyoung, Chung, Hae-jin, Woo, Ah-hyun, Noda, Isao, Jung, Young-mee
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8125589/
https://www.ncbi.nlm.nih.gov/pubmed/33947128
http://dx.doi.org/10.3390/polym13091447
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author Park, Yeonju
Kim, Minkyoung
Chung, Hae-jin
Woo, Ah-hyun
Noda, Isao
Jung, Young-mee
author_facet Park, Yeonju
Kim, Minkyoung
Chung, Hae-jin
Woo, Ah-hyun
Noda, Isao
Jung, Young-mee
author_sort Park, Yeonju
collection PubMed
description The temperature and mechanism of phase transition of poly(N-isopropylacrylamide-co-acrylic acid) [P(NiPAAm-co-AAc)], which is one of the multi-stimuli responsive polymers, were investigated at various pHs using infrared (IR) spectroscopy, two-dimensional (2D) gradient mapping, and two-dimensional correlation spectroscopy (2D-COS). The determined phase transition temperature of P(NiPAAm-co-AAc) at pH 4, 3, and 2 based on 2D gradient mapping and principal component analysis (PCA) showed that it decreases with decreasing pH, because COOH group in AAc changes with variation of pH. The results of 2D-COS analysis indicated that the phase transition mechanism of P(NiPAAm-co-AAc) hydrogel at pH4 is different from that at pH2 due to the effect of COOH group of AAc.
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spelling pubmed-81255892021-05-17 The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS Park, Yeonju Kim, Minkyoung Chung, Hae-jin Woo, Ah-hyun Noda, Isao Jung, Young-mee Polymers (Basel) Article The temperature and mechanism of phase transition of poly(N-isopropylacrylamide-co-acrylic acid) [P(NiPAAm-co-AAc)], which is one of the multi-stimuli responsive polymers, were investigated at various pHs using infrared (IR) spectroscopy, two-dimensional (2D) gradient mapping, and two-dimensional correlation spectroscopy (2D-COS). The determined phase transition temperature of P(NiPAAm-co-AAc) at pH 4, 3, and 2 based on 2D gradient mapping and principal component analysis (PCA) showed that it decreases with decreasing pH, because COOH group in AAc changes with variation of pH. The results of 2D-COS analysis indicated that the phase transition mechanism of P(NiPAAm-co-AAc) hydrogel at pH4 is different from that at pH2 due to the effect of COOH group of AAc. MDPI 2021-04-29 /pmc/articles/PMC8125589/ /pubmed/33947128 http://dx.doi.org/10.3390/polym13091447 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Park, Yeonju
Kim, Minkyoung
Chung, Hae-jin
Woo, Ah-hyun
Noda, Isao
Jung, Young-mee
The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title_full The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title_fullStr The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title_full_unstemmed The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title_short The Study of pH Effects on Phase Transition of Multi-Stimuli Responsive P(NiPAAm-co-AAc) Hydrogel Using 2D-COS
title_sort study of ph effects on phase transition of multi-stimuli responsive p(nipaam-co-aac) hydrogel using 2d-cos
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8125589/
https://www.ncbi.nlm.nih.gov/pubmed/33947128
http://dx.doi.org/10.3390/polym13091447
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