1996 Fiscal Year Final Research Report Summary
Morphology and gas permselectivity of polymer mixture system
| Project/Area Number |
06045018
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | University-to-University Cooperative Research |
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
TSUJITA Yoshiharu Faculty of Technology, Nagoya Institute of Technology, 工学部, 教授 (70016591)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMIZU Hiroaki Faculty of Technology, Nagoya Institute of Technology, 工学部, 助手 (10240350)
KINOSHITA Takatoshi Faculty of Technology, Nagoya Institute of Technology, 工学部, 助教授 (60135407)
HIGGINS Julia Department of Chemical Engineering and Chemical Technology, Imperial College of, 教授
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| Project Period (FY) |
1994 – 1996
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| Keywords | polymer blend / polystirene / polycarbonate blend system / poly (methyl methacrylate) / poly (stirene-co-acrylonitrile) blend system / polyimide / polyimide blend system / miscibility / gas transport properties / additivity rule / solid-state NMR |
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| Research Abstract |
In this study, to obtain the relationships between the morphologies and gas transport properties of the polymer mixture systems, the following three types of the polymer blend systems were investigated.
1. polystirene/polycarbonate (PS/PC) blend system
From the results of DSC,WAXD,and solid-state NMR for the PS/PC blend system membranes which were prepared by solution-casting, it was confirmed that the polymer blend system is immiscible and PC component is partially crystallized. The fact that CO_2 sorption amount for the polymer blend was larger than that expected from simple additivity rule was mainly explained by the amount of the crystallite of PC.
2. poly (methyl methacrylate)/poly (stirene-co-acrylonitlile) (PMMA/SAN) blend system
PMMA was found to be miscible with SAN,having an AN content from 17.9 to 39.5mol% at a level of less than 30-70*, from the ^1H spin-diffusion behavior. The CO_2 permeability and diffusion coefficients of the blend membranes were larger than those expected from the additivity rule, although the solubility coefficients follow this rule. From the dielectric relaxation spectra of PMMA/SAN blend system, it was concluded that the local mobility of PMMA was activated by blending with SAN,resulting the gas diffusion and permeability promoted some extens. Moreover, it was suggested that the distance between AN is related for the miscibility of the PMMA/SAN blend system.
3. polyimide/polyimide (PI/PI) blend system
Rod-like PI/flexible PI blend membranes were obtained by mixing the corresponding precursors at the various stirring temperatures. From the results of DMS and TEM,it was found that the blend systems become completely miscible when the stirring temperatures is high. The permeability coefficient of PI/PI blend membrane was higher than that expected from the additivity rule. In conclusion, the blending rod-like PI and flexible PI promotes the gas transport properties some extents.
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