Time-resolved in situ ATR-IR observations of the process of sorption of water into a poly(2-methoxyethyl acrylate) film

Shigeaki Morita, Masaru Tanaka, Yukihiro Ozaki

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124 Citations (Scopus)

Abstract

A process of water sorption into a biocompatible polymer, poly (2-methoxyethyl acrylate) (PMEA), was investigated by time-resolved, in situ, attenuated total reflection infrared spectroscopy. Evidence for three different types of hydrated water in PMEA, that is, nonfreezing water, freezing bound water, and freezing water, were found. Each hydration structure was elucidated at the functional group level. Nonfreezing water, which never crystallizes, even at -100 °C, has a C=O⋯H-O type of hydrogen bonding interaction with the carbonyl group of PMEA. Freezing bound water, which crystallizes in a heating process below 0 °C, interacts with the methoxy moiety in the PMEA side chain terminal. Freezing water, which crystallizes -0 °C, has bulk-water-like structure with an O-H⋯O-H hydrogen bonds network. It has been concluded from the present study that the methoxy moiety in the PMEA side chain terminal plays an important role for the excellent biocompatibility of PMEA.

Original languageEnglish
Pages (from-to)3750-3761
Number of pages12
JournalLangmuir
Volume23
Issue number7
DOIs
Publication statusPublished - Mar 27 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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