Hydration mechanism on a poly(methacrylic acid) film studied by in situ attenuated total reflection infrared spectroscopy

被引：19

作者：

Tajiri, Tomokazu ^{[1
,2
]}

Morita, Shigeaki ^{[3
]}

Ozaki, Yukihiro ^{[1
]}

机构：

[1] Kwansei Gakuin Univ, Dept Chem, Sch Sci & Technol, Sanda, Hyogo 6691337, Japan

[2] Astellas Pharma Inc, Pharmaceut Anal Pharmaceut Res & Technol Labs, Technol, Shizuoka 4250072, Japan

[3] Nagoya Univ, EcoTopia Sci Inst, Aichi 4648603, Japan

来源：

POLYMER | 2009年 / 50卷 / 24期

关键词：

Poly(methacrylic acid) (PMAA); Hydrogen bonding; Hydration; HYDROGEN-BONDING INTERACTION; POLARIZED IR-SPECTRA; ACETIC-ACID; FORMIC-ACID; AB-INITIO; RAMAN; WATER; SORPTION; STATES; DIMER;

D O I：

10.1016/j.polymer.2009.09.060

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A drastic structure change during a hydration process of a poly(methacrylic acid) (PMAA) film was observed by time-resolved in situ attenuated total reflection infrared (ATR-IR) spectroscopy. Inter- or intra-hydrogen-bonds via side-chain carboxyl groups are formed as cyclic dimers, side-on dimers and linear open chain oligomers including open dimers in a dried PMAA film. By contacting water, the side-chain hydrogen-bonds in PMAA are dissociated instantly, and then the subsequent carboxyl groups which have no hydrogen-bond newly hydrate with water molecules in a side-on form. Quantum chemical calculations (QCCs) using a model monomer of propionic acid (PA) also support the hydrogen-bonded and hydrated structures explored by the ATR-IR spectroscopy. It has been concluded from the present study that the dissociation of hydrogen-bonded and newly created hydrated structures via the carboxyl groups play an important role for the swelling of PMAA in water. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：5765 / 5770

页数：6

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