TY - JOUR
T1 - Local Dynamics of the Hydration Water and Poly(Methyl Methacrylate) Chains in PMMA Networks
AU - Fujii, Yoshihisa
AU - Tominaga, Taiki
AU - Murakami, Daiki
AU - Tanaka, Masaru
AU - Seto, Hideki
N1 - Funding Information:
The neutron experiments at the Materials and Life Science Experimental Facility at J-PARC were performed under user programs (Proposal Nos. 2018B0235 and 2020A0247). This work was supported by the JSPS KAKENHI Grant Numbers JP19H05717 and JP19H05720 (Aquatic Functional Materials).
Publisher Copyright:
Copyright © 2021 Fujii, Tominaga, Murakami, Tanaka and Seto.
PY - 2021/10/29
Y1 - 2021/10/29
N2 - The dynamic behavior of water molecules and polymer chains in a hydrated poly(methyl methacrylate) (PMMA) matrix containing a small amount of water molecules was investigated. Water molecules have been widely recognized as plasticizers for activating the segmental motion of polymer chains owing to their ability to reduce the glass transition temperature. In this study, combined with judicious hydrogen/deuterium labeling, we conducted quasi-elastic neutron scattering (QENS) experiments on PMMA for its dry and hydrated states. Our results clearly indicate that the dynamics of hydrated polymer chains are accelerated, and that individual water molecules are slower than bulk water. It is therefore suggested that the hydration water affects the local motion of PMMA and activates the local relaxation process known as restricted rotation, which is widely accepted to be generally insensitive to changes in the microenvironment.
AB - The dynamic behavior of water molecules and polymer chains in a hydrated poly(methyl methacrylate) (PMMA) matrix containing a small amount of water molecules was investigated. Water molecules have been widely recognized as plasticizers for activating the segmental motion of polymer chains owing to their ability to reduce the glass transition temperature. In this study, combined with judicious hydrogen/deuterium labeling, we conducted quasi-elastic neutron scattering (QENS) experiments on PMMA for its dry and hydrated states. Our results clearly indicate that the dynamics of hydrated polymer chains are accelerated, and that individual water molecules are slower than bulk water. It is therefore suggested that the hydration water affects the local motion of PMMA and activates the local relaxation process known as restricted rotation, which is widely accepted to be generally insensitive to changes in the microenvironment.
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U2 - 10.3389/fchem.2021.728738
DO - 10.3389/fchem.2021.728738
M3 - Article
AN - SCOPUS:85119037652
VL - 9
JO - Frontiers in Chemistry
JF - Frontiers in Chemistry
SN - 2296-2646
M1 - 728738
ER -