The Structure of Water Sorbed to Polymethoxyethylacrylate Film as Examined by FT–IR Spectroscopy

Kitano, Hiromi; Ichikawa, Kimihisa; Fukuda, Mitsuhiro; Mochizuki, Akira; Tanaka, Masaru

doi:10.1006/jcis.2001.7785

Cited by 58 publications

(51 citation statements)

References 39 publications

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“…The band can be deconvoluted into distinct sub-bands within the OH stretching band, which reflect different types of water molecular environments. 3,11,14,15,17 This type of analysis was performed on our sorbed water spectra. We chose four sub-bands and designated them strongly-bound, medium-bound, weakly-bound and free water.…”

Section: A Tboc Systemmentioning

confidence: 99%

“…Previous literature indicates that the water is molecularly absorbed rather than dissociated. 14,15,18 The results for modified tBOC are shown in Figure 3b.…”

Section: A Tboc Systemmentioning

confidence: 99%

“…3,5,11,[14][15][16][17]19 This peak at 2953 cm -1 is due to water molecules H-bonded onto specific polar sites along the polymer network. In the tBOC photoresist system, the OH group formed during the deprotection would be a good candidate for a strong H-bonding site.…”

Section: A Tboc Systemmentioning

confidence: 99%

“…The molar absorptivity significantly increases with the degree of hydrogen bonding, so the cross section would be different for each sub-band. 5,11,14 Therefore, we look only at the change in each fraction with humidity to see how the interaction inside the polymer network is affected when more water is present. The fraction of each type of water present depends on various chemical and physical…”

Section: A Tboc Systemmentioning

confidence: 99%

“…3,5,[11][12][13][14][15][16] The vibrational spectrum can be measured in situ at a variety of humidities and provides details about the water-polymer interactions and hydrogen bonding. In this investigation, the molecular information obtained contributes to the understanding of transport through the polymer, which ultimately helps explain the deprotection reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Fourier transform infrared spectroscopy studies of water-polymer interactions in chemically amplified photoresists

McDonough

Chikán

Kim

et al. 2005

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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ABSTRACT:Fourier-Transform Infrared (FTIR) absorption spectroscopy is implemented to measure the infrared spectrum of water absorbed by the Poly(t-butoxycarbonylstyrene) (tBOC) and the ketal-protected Poly(hydroxystyrene) (KRS-XE) polymer photoresists.The shape and intensity of the OH stretching band of the water spectrum is monitored in a variety of humidity conditions in order to obtain information on the hydrogen-bonding interactions between the water and the polymer chains. The band is deconvoluted into four sub-bands, which represent four types of water molecules in different environments.Because of the hydrophilicity of the polymers studied, a large portion of the sorbed water molecules is believed to be strongly bound to the polar sites of the polymer. The ratios of each type of water are found to be dependent on the humidity conditions to which the sample was exposed. At higher humidities, there is an increase in the fraction of free and weakly-bound water molecules. These findings are used to explain the humidity dependence of the deprotection reaction rates, since certain types of water may slow transport of reactive species within the polymer network.2

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Section: A Tboc Systemmentioning

confidence: 99%

“…Previous literature indicates that the water is molecularly absorbed rather than dissociated. 14,15,18 The results for modified tBOC are shown in Figure 3b.…”

Section: A Tboc Systemmentioning

confidence: 99%

Section: A Tboc Systemmentioning

confidence: 99%

Section: A Tboc Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fourier transform infrared spectroscopy studies of water-polymer interactions in chemically amplified photoresists

McDonough

Chikán

Kim

et al. 2005

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Mechanism of Hydration Induced Stiffening and Subsequent Plasticization of Polyamide Aerogel

Moldován

Forgács

Paul

et al. 2023

Adv Materials Inter

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The mesoporous polyamide (PA) aerogel similar in chemical structure to DuPont's Kevlar is an advanced thermal insulation material tested in airspace applications. Unfortunately, the monolithic aerogel readily absorbs humidity (from moist air), which dramatically alters its mechanical properties. The compressive strength of the PA aerogel first increases when its water content increases, but subsequently decreases following additional hydration. To provide a coherent explanation for this non-monotonic change, the aerogel is hydrated stepwise and its hydration mechanism is elucidated by multiscale experimental characterization. The molecular structure is investigated by solid-state and liquid-state nuclear magnetic resonance (NMR) spectroscopy, and the morphology by small angle neutron scattering (SANS) at each equilibrium hydration state. The physico-chemical changes in the molecular level and in the nanoscale architecture are reconstructed. The first water molecules bind into the vacancies of the intermolecular H-bonding network of the PA macromolecules, which strengthens this network and causes concerted morphological changes, leading to the macroscopic stiffening of the monolith. Additional water disrupts the original H-bonding network of the macromolecules, which causes their increased segmental motion, marking the start of the partial dissolution of the nanosized fibers of the aerogel backbone. This eventually plasticizes the monolith.

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Preparation and characterization of novel pH‐sensitive binary grafted polymeric blends of gelatin and poly(vinyl alcohol): Water sorption and blood compatibility study

Bajpai¹,

Sharma²

2006

J of Applied Polymer Sci

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ABSTRACT:In this study, we attempted the synthesis and characterization of novel biocompatible hydrogels of binary polymeric blends of crosslinked poly(acrylic acid) grafted onto poly(vinyl alcohol) and gelatin by a redox polymerization technique. The end polymer was characterized by IR spectral analysis, differential scanning calorimetry measurements, and scanning electron microscopy. The prepared smart, environment-responsive hydrogels, containing polyelectrolyte domains, were assessed for their water sorption potential under various experimental conditions and were further used to evaluate important network parameters such as the crosslink density, number of elastically effective chains, and molecular mass between crosslinks. The diffusion mechanism of the solvent-polymer interaction was also analyzed to predict the behavior of continuously relaxing chains containing several carboxylate ions. The blood compatibility of premeditated hydrogels was also judged by in vitro methods such as protein adsorption, blood clot formation, and hemolysis percentage assay measurement.

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The Structure of Water Sorbed to Polymethoxyethylacrylate Film as Examined by FT–IR Spectroscopy

Cited by 58 publications

References 39 publications

Fourier transform infrared spectroscopy studies of water-polymer interactions in chemically amplified photoresists

Fourier transform infrared spectroscopy studies of water-polymer interactions in chemically amplified photoresists

Mechanism of Hydration Induced Stiffening and Subsequent Plasticization of Polyamide Aerogel

Preparation and characterization of novel pH‐sensitive binary grafted polymeric blends of gelatin and poly(vinyl alcohol): Water sorption and blood compatibility study

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