State of Irremovable Water in Solid Polymer Films Examined by Fourier Transform Infrared Spectroscopy I:  Poly(Ethylene Glycol) Dimethyl Ether

Gemmei‐Ide, Makoto; Motonaga, Tetsuya; Kitano, Hiromi

doi:10.1021/la060413z

Cited by 7 publications

(5 citation statements)

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“…The spectral profiles of water in PEG–water systems were different from the spectrum of pure water. Water molecules in solid PEG ( W C of 1.42 wt %) were reported to be in monomeric or dimeric states associated with the oxygen atoms of PEG chains via H bonding and were reported to be localized in the amorphous region of PEG. − As is well-known, PEG is a crystalline polymer, and a PEG chain in the crystalline region has a 7/2 helical conformation: the band at 2885 cm –1 has been assigned to symmetric CH stretching of the PEG chain with a ttg conformation. , …”

Section: Resultsmentioning

confidence: 99%

Two-Step Recrystallization of Water in Concentrated Aqueous Solution of Poly(ethylene glycol)

et al. 2013

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Crystallization behavior of water in a concentrated aqueous solution of poly(ethylene glycol) (PEG) with a water content of 37.5 wt % was investigated by temperature variable mid-infrared (mid-IR) spectroscopy in a temperature range of 298-170 K. The mid-IR spectrum of water at 298 K showed that a large water cluster was not formed and that most of the water molecules were associated with the PEG chain. Ice formation, however, occurred as found in previous studies by differential scanning calorimetory. Ice formations were grouped into three types: crystallization at 231 K during cooling, that at 198 K during heating, and that at 210 K during heating. The latter two were just recrystallization. These ice formations were the direct transition from hydration species to ice without condensation regardless of crystallization or recrystallization. This means that the recrystallized water in the present system was not generated from low-density amorphous solid water. At a low cooling rate, nearly complete crystallization at 231 K during cooling and no recrystallization were observed. At a high cooling rate, no crystallization and two-step recrystallization at 198 and 210 K were observed. The former and latter recrystallizations were found to be generated from water associated with the PEG chains with ttg (the sequence -O-CH(2)-CH(2)-O- having a trans (t) conformation about the -C-O- bond and a gauche (g) conformation about the -C-C- bond) and random conformations, respectively. These results indicate that recrystallizable water does not have a single specific water structure.

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Section: Resultsmentioning

confidence: 99%

Two-Step Recrystallization of Water in Concentrated Aqueous Solution of Poly(ethylene glycol)

et al. 2013

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“…This is particularly interesting because usually the solvent retention is ascribed to specific solvent-polymer interactions such as hydrogen bridges [19]. It is obvious that this cannot be possible in the present case, where both the solvent and the polymer are perfluorinated compounds which lack hydrogen bridges.…”

Section: Membrane Preparationmentioning

confidence: 94%

On the unusual solvent retention and the effect on the gas transport in perfluorinated Hyflon AD® membranes

Jansen

Macchione

Drioli

2007

Journal of Membrane Science

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“…The considerable difference of the spectra between pure water and sorbed water indicates that most of the sorbed water interacts with not only water but also the functional groups (O atoms). Previous studies of W C dependences of the spectrum of water sorbed into PMEA 29,30 and poly(ethylene glycol) 31,32 demonstrated that the relative absorbance of the two lowerfrequency components increases with W C . This suggests that the two lower-and the two higher-frequency components come from the O−H groups H-bonded to the O atom(s) of the water molecule and the polymers, respectively.…”

Section: Resultsmentioning

confidence: 98%

Diffusion-Controlled Recrystallization of Water Sorbed into Poly(meth)acrylates Revealed by Variable-Temperature Mid-Infrared Spectroscopy and Molecular Dynamics Simulation

et al. 2017

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Recrystallization behaviors of water sorbed into four poly(meth)acrylates, poly(2-methoxyethyl acrylate), poly(tetrahydrofurfuryl acrylate), poly(methyl acrylate), and poly(methyl methacrylate), are investigated by variable-temperature mid-infrared (VT-MIR) spectroscopy and molecular dynamics (MD) simulation. VT-MIR spectra demonstrate that recrystallization temperatures of water sorbed into the polymers are positively correlated with their glass-transition temperatures reported previously. The present MD simulation shows that a lower-limit temperature of the diffusion for the sorbed water and the glass-transition temperatures of the polymers also have a positive correlation, indicating that the recrystallization is controlled by diffusion mechanism rather than reorientation mechanism. Detailed molecular processes of not only recrystallization during rewarming but also crystallization during cooling and hydrogen-bonding states of water in the polymers are systematically analyzed and discussed.

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State of Irremovable Water in Solid Polymer Films Examined by Fourier Transform Infrared Spectroscopy I: Poly(Ethylene Glycol) Dimethyl Ether

Cited by 7 publications

References 0 publications

Two-Step Recrystallization of Water in Concentrated Aqueous Solution of Poly(ethylene glycol)

Two-Step Recrystallization of Water in Concentrated Aqueous Solution of Poly(ethylene glycol)

On the unusual solvent retention and the effect on the gas transport in perfluorinated Hyflon AD® membranes

Diffusion-Controlled Recrystallization of Water Sorbed into Poly(meth)acrylates Revealed by Variable-Temperature Mid-Infrared Spectroscopy and Molecular Dynamics Simulation

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