Structure of water sorbed into poly(MEA-co-HEMA) films as examined by ATR-IR spectroscopy

Makoto Ide, Takayuki Mori, Ken Ichikawa, Hiromi Kitano, Masaru Tanaka, Akira Mochizuki, Hiroaki Oshiyama, Wataru Mizuno

Research output: Contribution to journalArticle

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Abstract

The structure of water sorbed into poly(2-methoxyethyl acrylate) (PMEA), poly(2-hydroxyethyl methacrylate) (PHEMA), and their copolymers (p(MEA/HEMA)) was investigated by attenuated total reflection infrared (ATR-IR) spectroscopy. The extinction coefficient of the OH stretching band of sorbed water (εOH) was calculated from the band area obtained by IR measurement and the amount of sorbed water obtained by thermogravimetric analysis. When the polymers contacted with water vapor (relative humidity = ∼55%), the eon values were quite similar in all polymers. On the other hand, when the polymers contacted with liquid water, the εOH values were drastically changed by the content of 2-methoxyethyl acrylate (MEA). When the MEA content of the polymers was low (<60 mol %), the εOH value of the water sorbed into polymers in contact with liquid water was equal to that in contact with water vapor. In the higher MEA content (70-100 mol %), on the other hand, the εOH values of the water sorbed into polymers in contact with liquid water were 5-8 times larger than that in contact with water vapor. These results seemed to indicate that the interaction between the primary hydration water around the MEA-containing polymer chain and water molecules surrounding the primarily hydrating water is very weak. Such water with a large εOH value seemed to correspond to "cold-crystallizable" water, which has been observed by DSC as anomalous water other than intermediate and nonfreezable waters. Taking both the experimental results obtained in this work and those thermodynamically obtained previously into consideration, it was strongly suggested that the cold crystallization of water is generated by caging water molecules in a small space by the polymer chains with a small hydration region. The correlation between the εOH value and the blood compatibility of the copolymer was also discussed.

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalLangmuir
Volume19
Issue number2
DOIs
Publication statusPublished - Jan 21 2003

Fingerprint

acrylates
Infrared spectroscopy
infrared spectroscopy
Water
water
Polymers
polymers
Steam
Contacts (fluid mechanics)
water vapor
Water vapor
hydroxyethyl methacrylate
acrylic acid
Hydration
hydration
copolymers
liquids
Liquids
Copolymers
cold water

All Science Journal Classification (ASJC) codes

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

Cite this

Ide, M., Mori, T., Ichikawa, K., Kitano, H., Tanaka, M., Mochizuki, A., ... Mizuno, W. (2003). Structure of water sorbed into poly(MEA-co-HEMA) films as examined by ATR-IR spectroscopy. Langmuir, 19(2), 429-435. https://doi.org/10.1021/la020617p

Structure of water sorbed into poly(MEA-co-HEMA) films as examined by ATR-IR spectroscopy. / Ide, Makoto; Mori, Takayuki; Ichikawa, Ken; Kitano, Hiromi; Tanaka, Masaru; Mochizuki, Akira; Oshiyama, Hiroaki; Mizuno, Wataru.

In: Langmuir, Vol. 19, No. 2, 21.01.2003, p. 429-435.

Research output: Contribution to journalArticle

Ide, M, Mori, T, Ichikawa, K, Kitano, H, Tanaka, M, Mochizuki, A, Oshiyama, H & Mizuno, W 2003, 'Structure of water sorbed into poly(MEA-co-HEMA) films as examined by ATR-IR spectroscopy', Langmuir, vol. 19, no. 2, pp. 429-435. https://doi.org/10.1021/la020617p
Ide, Makoto ; Mori, Takayuki ; Ichikawa, Ken ; Kitano, Hiromi ; Tanaka, Masaru ; Mochizuki, Akira ; Oshiyama, Hiroaki ; Mizuno, Wataru. / Structure of water sorbed into poly(MEA-co-HEMA) films as examined by ATR-IR spectroscopy. In: Langmuir. 2003 ; Vol. 19, No. 2. pp. 429-435.
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