Development of Supercritical CO_2 assisted polymer-processing techniques
| Project/Area Number |
15360420
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Reaction engineering/Process system
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| Research Institution | Kyoto University |
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Principal Investigator |
OHSHIMA Masahiro Kyoto University, Engineering, Professor, 工学研究科, 教授 (60185254)
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| Co-Investigator(Kenkyū-buntansha) |
KANO Manabu Kyoto University, Engineering, Associate Professor, 助教授 (30263114)
KIHARA Shin-ichi Kyoto University, Engineering, Lecture, 講師 (30284524)
石川 健 三菱化学(株), 科学技術センタ, 研究員
谷垣 昌敬 京都大学, 工学研究科, 教授 (30027148)
安田 和治 旭化成(株), 加工技術開発部, 課長
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2003: ¥12,600,000 (Direct Cost: ¥12,600,000)
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| Keywords | supercritical carbon dioxide / plastic processing / plasticization effect / solvation effect / surface modification / supercritical fluids / nano imprint / polymer processing / ナノインプリンティング / ナノセルラーフォーム / 微細転写 / 液相浸漬法 / カーボンナノチューブ / 高分子表面改質 / 表面抵抗 / 近赤外分光法 / 導電性 / ポリ乳酸 / 親水化 / 収着 / ポリマー / ポリスチレン / 物質移動 |
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| Research Abstract |
The application of CO_2 for processing the polymeric materials has been dramatically increased and CO_2 is being recognized as an efficient alternative to volatile organic solvents due to its environmentally benign characteristics as well as its advantageous properties of processing polymer. CO_2 can provide plasticization effect on polymer during the processing and ensure that the processed material does not contain any trace of solvent residue after processing.
In this three-year project, the following three major progresses could be achieved.
1)Utilizing the plasticization effect of CO_2 on polymer, dye, low molecular chemicals, such as PEG and carbon nanotube (CNT) were infused into the surface of thermoplastic polymers. Furthermore, the new CO_2 assisted surface modification injection molding scheme was proposed.
2)When the CO_2/polymer system is depressurized, scCO_2 diffuses out from the polymer while solute remains due to the difference of diffusivity in the polymer. The degree of
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solute infusion is dependent on the solubility of the solute in the scCO_2 and the affinity of the solute for the polymer matrix. To change the solubility of solute in the scCo_2, co-solvents such as alcohol and acetone are often used. In this study, the diffusivity and solubility of CO_2 and alcohol (propanol and/or ethanol) in molten low-density polyethylene (LDPE) was studied using near infrared spectroscopy and magnetic suspension balance.
3)Utilizing the plasticization effect of CO_2, a CO_2 assisted nano-imprinting and embossing scheme was developed. The surface of polymer product was plasticized by dissolving CO_2 in a high pressure mold stamping machine and the nanometer-scale fine pattern on the mold stamper was transferred to the plasticized surface without heating up the product. The thickness of the plasticized layer could be controlled in nanometer thickness by pressure level of CO_2 and CO_2 absorption time. The pattern transfer could be performed at room temperature without deforming the overall shape of the product. Less
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Report
(4 results)
Research Products
(13 results)
