2003 Fiscal Year Final Research Report Summary
DEVELOPMENT OF NEW POLYETHYLENE HOLLOW FIBER MEMBRANE WITH ASYMMETRIC STRUCTURE USED FOR WATER RECYCLE SYSTEM
| Project/Area Number |
14550749
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | KYOTO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MATSUYAMA Hideto KYOTO INSTITUTE OF TECHNOLOGY, DEPT. CHEM. AND MATERIALS TECHNOL., ASSOCIATE PROFESSORPROFESSOR, 工芸学部, 助教授 (50181798)
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| Co-Investigator(Kenkyū-buntansha) |
KANAMORI Toshiyuki INST. AD. IND. SCI. TECHNOL., ADV. MAUNFACTURING RESEARCH INST., SENIOR RESEARCHER, 物質プロセス研究部門, 主任研究官
KUBOTA Noboru ASAHI CHEMICALS CO.,IND., MEMBRANE DEVELOPMENT DEPT., MANAGER, 富士機能膜工場, 開発課長
TERAMOTO Masaai KYOTO INSTITUTE OF TECHNOLOGY, DEPT. CHEM. AND MATERIALS TECHNOL., PROFESSOR, 工芸学部, 教授 (60026086)
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| Project Period (FY) |
2002 – 2003
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| Keywords | thermally induced phase separation / polyethylene / microporous membrane / asymmetric structure / spinodal decomposition / light scattering |
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| Research Abstract |
1. Effect of extraction and drying on microporous polyethylene membrane structure
Ten different extractant and were used to remove mineral oil from polyethylene films and two different evaporation conditions were used to remove the extractant and produce microporous membranes. The dimension, microstructure and permeability of the membranes were used to measure the impact of extractant choice and drying conditions on the membrane morphology. The solubility parameters, boiling points and surface tensions of the extractants were related to the membrane morphology.
2. Thermodynamic and kinetic studies on the poly (ethylene-co-vinyl alcohol) (EVOH) membrane formation by thermally induced phase separation
The liquid-liquid phase boundaries (binodal line) was shifted to higher temperature when ethylene content in EVOH increased. For EVOHs with ethylene content of 32-44 mol%, cellular pores were formed, while only polymer crystallization occurred for EVOH with 27 mol% ethylene content.
3. preparation and Characteristics of polyethylene and EVOH hollow fiber membranes via thermally induced phase separation
Microporous PE and EVOH membranes were prepared by TIPS process. The effects of the experimental condition such as polymer molecular weight, air gap distance, cooling bath composition and ethylene content of EVOH on the membrane performance were investigated in detail.
4. Simulation of asymmetric structure formation via thermally induced phase separation
Asymmetric membranes having smaller pores at one side and larger pores at the other side were prepares by TIPS of polypropylene-diphenyl ether solution with polymer concentration gradient. The simulation of phase separation process by the spinodal decomposition was carried out based on Cahn-Hilliard model. The simulation results of pore size and the thickness of skin layer were approximately in agreement with the experimental results.
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