Presentations -
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NMR observations of the gases in polymers
Shohei Ariga, Hiroaki Yoshimizu
The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science
Event date： 2021.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
Various information obtained from the NMR spectrum of gas incorporated into the polymer was analyzed, and the detailed evaluation of the static and dynamic higher ordered structure of the polymer was tried.
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NMR characterizations of the gas sorption properties in silicon rubber
Shogo Iwama, Hiroaki Yoshimizu
The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science
Event date： 2021.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
In order to discuss the molecular mobilities change of polymer chain with gas sorption from NMR relaxation time, the examination was carried out with a commercially available O-ring.
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NMR observations of the gases diffusing in polymer crystals
Tomohiro Ueji, Hiroaki Yoshimizu
The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science
Event date： 2021.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
Gas diffusion characteristics of the syndiotactic polystyrene samples were evaluated by NMR method.
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The relationships between gas diffusion properties and structural features estimated by NMR spectral analyses of the sorption gases.
H.Yoshimizu
Annual Autumn Meeting 2021 The Society of Fiber Science and Technology, Japan
Event date： 2021.11
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
As an evaluation method by NMR of gas separation membrane, examinations of syndiotactic polystyrene (sPS) and poly 4-methyl-1-penten (PMP) are introduced. Temperature dependence such as gas permeation coefficient of the sPS crystal phase and gas diffusion characteristics of the oriented PMP crystal phase were evaluated.
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Correlation between polymer structure and function by NMR observation of dissolved gases
Hiroaki Yoshimizu
70th Symposium on Macromolecules The Society of Polymer Science, Japan
Event date： 2021.09
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
Various kinds of NMR techniques were carried out in the state in which the gas dissolved, in order to evaluate the correlation between the structural properties of various polymeric materials and the gas sorption and diffusion properties. Since the observation direction of the gas diffusion can be specified, the orientation characteristics of micro-crystallites can be examined.
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Gas diffusion anisotropy of the crystal-oriented polymethyl pentene fiber.
Ryoto Kiyose, Hiroaki Yoshimizu
Annual Meeting of The Society of Fiber Science and Technology, Japan 2021 The Society of Fiber Science and Technology, Japan
Event date： 2021.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：On line
This paper reports the gas diffusion anisotropy of the crystal-oriented polymethyl pentene fiber.
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Seiya Kohno, Hiroaki Yoshimizu
Annual Meeting of The Society of Fiber Science and Technology, Japan 2021 The Society of Fiber Science and Technology, Japan
Event date： 2021.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：On line
This paper reports the temperature dependence of gas transport characteristics in the crystalline phase of syndiotactic polystyrene.
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PMP 結晶の配向制御による気体透過性制御
清瀬稜人，吉水広明
第58回高分子と水に関する討論会 高分子学会 高分子と水・分離に関する研究会
Event date： 2020.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：オンライン会議
PMPの繊維状試料のXe-129 NMR測定から，結晶構造と気体拡散特性について検討した。
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配向制御した sPS の気体輸送特性
幸野誓哉，吉水広明
第58回高分子と水に関する討論会 高分子学会 高分子と水・分離に関する研究会
Event date： 2020.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：オンライン会議
気体存在下でsPSのNMR測定を行い，結晶構造と気体輸送特性について検討した。
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Anisotropic gas diffusion properties of the higher ordered structure of magnetic oriented liquid crystalline polyesters
H.Yoshimizu
Annual Autumn Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.11
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
Relatively higher 3-dimensional orientation of the layered structure could be achieved by modulated rotation under very high magnetic field. The NMR data show anisotropic gas diffusion properties, and these are consistent with the results of orientation structure determined by WAXD.
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Observations of plasticization of the glassy polymer by gas sorption using NMR
H.Yoshimizu
Annual Autumn Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.11
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
It was confirmed that the plasticization occurred at a certain sorption amounts and/or pressure under relatively low temperature by the sorption and various kinds of NMR measurements.
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Analyses of plasticization phenomenon of polymer materials by gas sorption
Hiroaki Yoshimizu, Hajime Ishitani
69th Symposium on Macromolecules The Society of Polymer Science, Japan
Event date： 2020.09
Language：Japanese Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
In this study, a plasticization phenomenon of polyphenylene oxide by Xe sorption was investigated.
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Control of anisotropy of the gas transport ways presented from highly ordered structure
Hiroaki Yoshimizu,Daiki Shoji
69th Symposium on Macromolecules The Society of Polymer Science, Japan
Event date： 2020.09
Language：English Presentation type：Oral presentation (general)
Venue：Online Virtual Meeting
In this study, the gas transport properties of liquid crystalline polyester with alkyl side chain were investigated from viewpoint of local molecular motions and orientations to get a smart permselective polymer membrane.
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Characterization of glassy state of polyimide by 129Xe NMR International conference
Hiroaki Yoshimizu
ACS National Meeting in San Franciso, August 16-20, 2020 Symposium on "NMR of Materials" American Chemical Society
Event date： 2020.08
Language：English Presentation type：Oral presentation (general)
Venue：San Franciso, US
An understanding of the fine structures of glassy polymers is very important for the development of gas-barrier and gas-separation membranes. 129Xe NMR porosimetry is a useful technique for this type of investigations. In this study, polyimide (PI) was used as a glassy polymer. A PI sample (about 150 mg) was packed into a 5-mm thck-wall Pyrex NMR sample tube, and then the desired pressure of Xe (129Xe isotope enriched at about 81 %) was introduced into the tube. After a sufficient time for sorption equilibrium, 129Xe NMR spectra were recorded. By analyzing the peak intensity, Xe sorption isotherms of PI at various temperatures were obtained. Then, the dual-mode sorption parameters were determined. CH’ (the Langmuir saturation constant) decreased with increasing temperature. For other glassy polymers, it had been reported that the expected temperature at CH’ = 0 was very close to glass transition temperature (Tg). Tg of PI was expected to be about 430 oC, although it could not be determined by DSC. Figure 1 shows the intensity-normalized 129Xe NMR spectra of PI under various pressures at room temperature. An increasing pressure (i.e., increasing sorption amount) led to a low-field shift. In view of these chemical shift data, PI contained relatively large spaces among polymer chains, when compared with other polymers. These structural features of PI are well able to explain the gas diffusion properties.
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Structure and gas diffusion properties of the magnetic oriented liquid crystalline polyester with alkyl side chains
Daiki Shoji, Hiroaki Yoshimizu
Annual Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：Tower Hall Funabori
The gas transport properties of liquid crystalline polyester with alkyl side chain was investigated from viewpoint of local molecular motions and orientations to get a smart permselective polymer membrane. This can be formed the layered structure which presents an anisotropic gas diffusion pathway. Relatively higher 3-dimensional orientation of the layered structure could be achieved by modulated rotation under very high magnetic field. The NMR data show anisotropic gas diffusion properties, and these are consistent with the results of orientation structure determined by WAXD.
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Crystal structure and gas transport properties of syndiotactic polystyrene
Seiya Kohno, Hiroaki Yoshimizu
Annual Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：Tower Hall Funabori
In order to get an information on the gas transport properties of crystalline parts of syndiotactic polystyrene, the gas permeation experiments were performed at various temperatures. It was suggested that the local motions of side phenyl ring leads open path and accelaration of diffusivity.
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Xe-129 NMR of polymer fibers
Ryoto Kiyose, Hiroaki Yoshimizu
Annual Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：Tower Hall Funabori
Xe-129 NMR spectra of poly4methyl1penten show that the low-field shift of chemical shift values and broadening peak width.
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The observations of plasticization of polyphenylene oxide caused by gas sorption using NMR
Hajime Ishitani, Hiroaki Yoshimizu
Annual Meeting 2020 The Society of Fiber Science and Technology, Japan
Event date： 2020.06
Language：Japanese Presentation type：Oral presentation (general)
Venue：Tower Hall Funabori
A plasticization phenomenon of polyphenylene oxide by Xe sorption was investigated. The conclusion that plasticization occurred when sorption amounts and/or pressure under relatively low temperature exceeded a certain value was led by the sorption and various kinds of NMR measurements. It was suggested that this phenomenon was similar to a plasticization phenomenon to be seen in the case of carbon dioxide sorption.
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Analysis of plasticization phenomenon accompanying gas sorption by NMR method
Hajime Ishitani, Hiroaki Yoshimizu
69th SPSJ Annual Meeting The Society of Polymer Science, Japan
Event date： 2020.05
Language：Japanese Presentation type：Poster presentation
In this study, a plasticization phenomenon of polyphenylene oxide (PPO) by Xe sorption was investigated. The conclusion that plasticization occurred when sorption amounts and/or pressure under relatively low temperature exceeded a certain value was led by the sorption and various kinds of NMR measurements. It was suggested that this phenomenon was similar to a plasticization phenomenon to be seen in the case of CO2 sorption.
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Magnetic field orientation and gas transport characteristics of liquid crystal polyester
Daiki Shoji, Hiroaki Yoshimizu
69th SPSJ Annual Meeting The Society of Polymer Science, Japan
Event date： 2020.05
Language：Japanese Presentation type：Poster presentation
In this study, the gas transport properties of liquid crystalline polyester with alkyl side chain, B-Cn were investigated from viewpoint of local molecular motions and orientations to get a smart permselective polymer membrane. B-Cn can be formed the layered structure which presents an anisotropic gas diffusion pathway. Relatively higher 3-dimensional orientation of the layered structure could be achieved by modulated rotation under very high magnetic field. The NMR data show anisotropic gas diffusion properties, and these are consistent with the results of orientation structure determined by WAXD.
