Understanding Thermal Behavior of Poly(ethylene glycol)-block-poly(N-isopropylacrylamide) Hydrogel Using Two-Dimensional Correlation Infrared Spectroscopy

Author:

Park Yeonju1,Kim Minkyoung2,Noda Isao3ORCID,Jung Young Mee12ORCID

Affiliation:

1. Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon, Korea

2. Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon, Korea

3. Department of Materials Science and Engineering, University of Delaware, Newark, USA

Abstract

In this study, one of the thermoresponsive polymers, block copolymer consisting of poly(ethylene glycol) and poly( N-isopropylacylamide), was investigated using Fourier transform infrared (FT-IR) spectroscopy, principal component analysis (PCA), and two-dimensional correlation spectroscopy (2D-COS). The apparent trend of the spectral changes in the temperature-dependent FT-IR spectra of poly(ethylene glycol)- block-poly( N-isopropylacylamide) (PEG- b-PNiPAAm) hydrogel during the heating process looks similar to that during the cooling process. The results of the PCA and 2D-COS, however, clearly indicate an irreversible phase transition mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes. It has been also shown that PEG affects the phase transition mechanism of PEG- b-PNiPAAm hydrogel, especially during the heating process. Consequently, we can successfully determine the phase transition temperature and the mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes using PCA and 2D-COS, respectively.

Funder

Ministry of Education, Korea

National Research Foundation of Korea

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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