2002 Fiscal Year Final Research Report Summary
A New Preparation Method of Inorganic Ultrafine Particles by Using Water-borne Associating Polymer
| Project/Area Number |
13650816
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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 |
化学工学一般
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| Research Institution | Kagoshima University |
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Principal Investigator |
UEMURA Yoshimitsu Kagoshima University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60160222)
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| Co-Investigator(Kenkyū-buntansha) |
AIKO Ryoko Kagoshima University, Faculty of Engineering, Research Assistant, 工学部, 教務職員 (50244265)
YOSHIDA Masahiro Kagoshima University, Faculty of Engineering, Research Associate, 工学部, 助手 (50315397)
HATATE Yasuo Kagoshima University, Faculty of Engineering, Professor, 工学部, 教授 (00038051)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Association / Polymer / PVA / Ultrafine Particle / Hydrophobic interaction / Zirconia |
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| Research Abstract |
Alkyl modified poly(vinyl alcohols) (PVAs) are classified as water-borne associating polymers which associate in water and form associating clusters. In this study, hydrophobically-modified polyvinyl alcohols, in which a dodecyl group is located only at one end of the backbone, were used for preparing inorganic fine particles such as zirconia. The basic scheme for preparing fine particles is formation of composite clusters which consist of the alkyl modified PVAs clusters and a hydrophobic zirconium salt (zirconium acetate) in the clusters. For forming such composite clusters, an alkyl modified PVA aqueous solution was mixed with a zirconium acetate-acetic acid solution, and the mixture was stirred mildly for several hours. During this mild stirring, zirconium acetate is expected to enter the inside of the PVA cluster. The mixture was dried and calcined in order to form zirconia fine particles from zirconium acetate. The effects of preparation conditions on the particles morphology and the diameters of primary and secondary particles were investigated.
By applying hydrophobically-modified PVAs, zirconia fine particles as a primary structure were obtained. Difference between what we expected and what was observed is that fine particles (primary structure) were also obtained using the control polymer (i.e., an ordinary PVA), although the size of the particles was larger than that of the particles prepared using the hydrophobically-modified PVA.
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