Presentations -
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Gas transport characterization of the liquid crystalline polyester by magnetic field oriented control
Event date： 2016.09
Language：Japanese Presentation type：Poster presentation
Wholly aromatic liquid crystalline polyester having an alkyl side chain (PBpT-O10) form a honeycomb structure by rigid main chain backbone and flexible side chains layer. In this study, we synthesize a wholly aromatic polyester PBpT-O10 were studied using NMR for effect on the diffusion of gases. As a result, a side chain region formed in the structure was confirmed to have high diffusivity.
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The NMR observations of glassy polymers via the gases in polymer
Event date： 2016.09
Language：Japanese Presentation type：Oral presentation (invited, special)
The gas sorption isotherms and NMR spectra of PI, PPO, and PC including gases were observed, in order to discuss the higher-ordered structures of these in glassy state with other results about gas transport properties. It was pointed that the micro voids (excess free volumes) play the significant role for their gas transport properties from viewpoints of not only size and number but also connectivity of the micro voids.
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Higher-ordered structures and gas transport properties of the polyglutamates studied by NMR methods
Event date： 2016.09
Language：Japanese Presentation type：Oral presentation (invited, special)
The structural analyses and gas transport properties of the liquid-crystalline polyglutamates were performed and estimated by mainly using NMR techniques. The gas transport properties of these polypeptides were strongly influenced by the fine structures and dynamics of side chains. Further, the anisotropic gas diffusion properties were confirmed from the magnetically oriented samples.
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NMR spectral observations of the water molecules in polymers
Event date： 2016.09
Language：Japanese Presentation type：Oral presentation (invited, special)
The water in polymers such as ethylene-vinyl alcohol copolymer (EVOH) were measured by some spectroscopic methods. Deuterium oxide (D2O) were used for the polymers having hydroxyl groups. In this presentation, some researches on the free and/or restricted water molecules finely observed by several NMR techniques were shown.
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Gas Diffusion of Butadiene Rubber Measured by NMR International conference
Asami Miyashiro, Hiroaki Yoshimizu
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Poster presentation
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
In this study, several techniques of NMR were applied for the measurement of gas diffusion using butadiene rubber; BR. Diffusion coefficient of Xe in BR was determined as to be 4.5×10-7 cm2/s by curve-fitting using Fick's equation. The diffusion coefficient can be determined from the NMR data as same as that of above.
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Characterization of glassy state by 129Xe NMR observation of the Xe in glassy polymers International conference
H. Yoshimizu, M. Fujita
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Oral presentation (general)
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
In this study, polyimide; PI, polyphenylene oxide; PPO, and polycarbonate; PC were used as glassy polymers. PI forms the large microvoids but few numbers. In the case of PC, the small microvoids are moderately formed. The large and many microvoids are formed in PPO. These structural features are well able to explain the gas diffusiveties of PI, PC, and PPO which were discussed from the peak widths of the Xe in them.
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Gas Diffusion Properties of the Poly(glutamates) by PFG NMR International conference
H. Yoshimizu, R. Suzuki, J. Iwamoto
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Oral presentation (general)
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
In this study, two types of poly(glutamates) were chosen, namely, lyotropic and thermotropic liquid crystalline ones. Values of the self-diffusion coefficients of the magnetically oriented samples were larger than those of randomly oriented samples. These results show gas diffusion anisotropy of the helix bundles in polypeptides, and then, the gas diffusion properties of polypeptide solids are controllable by the magnetic orientation.
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Gas Transport Properties of Liquid Crystalline Polyesters with Several Higher-Order Structures by NMR Techniques International conference
Ryota Ishigami, Hiroaki Yoshimizu
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Poster presentation
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
In this study, two all aromatic polyesters with alkyl side chains were investigated. Mono axially oriented structure was confirmed from the 13C CP/static NMR measurements and the spectral analysis based on the chemical shift anisotropy. The gas diffusion properties of these polyesters are anisotropic.
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Molecular Mobility of Benzene Rings in the Crystal of Syndiotactic Polystyrene Studied by Solid-State NMR International conference
Mika Ito, Hiroaki Yoshimizu
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Poster presentation
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
Syndiotacyic polystyrene (sPS) is one of the polymorphic polymers, and the alpha and delta form crystals of sPS are consisted by the chains in TT and TTGG conformations, respectively. In this study, to analyze the crystalline structures in detail to clarify its material transport mechanisms, the molecular mobility of benzene rings in the alpha, delta, and amorphous phases were investigated by solid-state 13C CP/MAS NMR. The mobility of benzene ring of alpha and delta forms are lower and higher than that of amorphous, respectively.
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129Xe NMR observations of the Gas Transport Properties of Poly(styrene) and Poly(methyl methacrylate) International conference
E. Nishiguchi, H. Yoshimizu
The 10th Conference of Aseanian Membrane Society (AMS10) Aseanian Membrane Society
Event date： 2016.07
Language：English Presentation type：Poster presentation
Venue：Nara Kasugano International Forum IRAKA, Nara, Japan
In order to understand the gas transport mechanisms of polymeric materials, the gas solubility and diffusivity for poly(styrene) (PS) and poly(methyl methacrylate) (PMMA) were investigated by sorption and 129Xe NMR measurements at various temperatures. In this stage, it can be said that the differences of gas diffusion properties of PS and PMMA should be explain only by their free volumes.
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Diffusion properties of the gas in solid polygulutamates
Risa SUZUKI, Jun IWAMOTO, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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Gas transport properties of the liquid crystalline polyester formed in the honeycomb structure
Ryota ISHIGAMI, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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Studies on local molecular mobility of syndiotactic polystyrene by solid-state NMR method
Mika ITO, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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Higher order structures of PS and PMMA evaluated by temperature dependence of 129Xe NMR
Eriko NISHIGUCHI, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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Determination of gas diffusion coefficient of butadiene rubber using NMR methods
Asami MIYASHIRO, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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The glassy state of polymer studied by Xe-129 NMR spectroscopy
Masaya FUJITA, Mayu TSUCHIMOTO, Hiroaki YOSHIMIZU
Event date： 2016.06
Language：Japanese Presentation type：Oral presentation (general)
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Studies of diffusion of the gas in honeycombed structure formed from the liquid crystalline polyester with alkyl side chains
Ryota ISHIGAMI, Hiroaki YOSHIMIZU
Event date： 2016.05
Language：Japanese Presentation type：Poster presentation
The aromatic liquid crystalline polyester with alkyl side chains is able to form a honeycombed structure consisted with rigid main chain and flexible side chains layers. In this study, we synthesize an aromatic polyester with alkyl side chain having 10 carbons in every chains, were synthesized and its higher-ordered structures and gas diffusion properties were studied by using NMR techniques. As a result, the gas diffusion properties of this polyester were relatively high.
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Molecular mobility of benzene rings in the crystal of syndiotactic polystyrene by solid-state NMR method
Mika ITO, Hiroaki YOSHIMIZU
Event date： 2016.05
Language：Japanese Presentation type：Poster presentation
Syndiotactic polystyrene show polymorphism, some are those applications as separation membranes is expected. In this study, to analyze the crystal structures as the first step in order to know its separation properties, we evaluated the molecular mobility of benzene rings in alpha and delta crystalline, and amorphous phases by solid-state C-13 CP/MAS NMR. Through the T1 relaxation time measurement, it was found that the T1 values of the phenyl carbons in alpha and delta forms at room temperature are different.
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The diffusion properties of Xe in PS and PMMA as studied by NMR methods
Eriko NISHIGUCHI, Hiroaki YOSHIMIZU
Event date： 2016.05
Language：Japanese Presentation type：Poster presentation
In this study, the difference of gas diffusion properties of polymethyl methacrylate and polystyrene, which have almost the same amounts of gas sorption, were investigated using NMR methods at various temperatures and pressures. The peak width of the Xe in polystyrene was broader than that in polymethyl methacrylate.
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Gas diffusion coefficients of rubbery polymers determined by NMR methods
Asami MIYASHIRO, Hiroaki YOSHIMIZU
Event date： 2016.05
Language：Japanese Presentation type：Poster presentation
In order to establish the novel determination of gas diffusion coefficient by means of NMR spectroscopy, it was tried that the methane gas in rubbery polymer was investigated by several NMR techniques. The estimated values obtained in this study are almost same compared with the data gotten by conventional methods.
