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Volume 67, Issue 1
Displaying 1-6 of 6 articles from this issue
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Seisirô ITÔ, Keiji MINAMIHA, Jiro SHIODAWA1994 Volume 67 Issue 1 Pages 7-13
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSLow-temperature oxygen plasma treatment as a surface activation method of fine organic polymer particles and the nickel coating of their activated surfaces were investigated. Monodispersed and crosslinked spherical acrylstyrene particles were used as the fine polymer particles.
By the plasma treatment, oxygen-containing functional groups, such as carbonyl and carboxyl groups, were introduced on the surface of the polymer particles to be activated. After being, heated and refluxed in diphenyl ether solution with bis (acetylacetonato) nickel (II) ([Ni (acac) 2]) and anhydrous hydrazine, the plasma-treated polymer powders were covered with nickel. The most suitable amount of [Ni (acac) 2] and anhydrous hydrazine were 1.0×10-2 and 1.0 ×10-1 mol per 0.5/m2 of the plasmatreated polymer particles, respectively.View full abstractDownload PDF (1131K) -
Tsutomu KENPO, Naoto YAMAMOTO1994 Volume 67 Issue 1 Pages 14-23
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe shear stress dependences of apparent viscosity (ηa) and storage and loss moduli (G' and G”), and the frequency dependences of G' and G” were measured with regard to magnetic paints prepared using metal magnetic powders (MMPs) with three different water contents, 0.3 (A), 0.6 (B), and 1.0 wt% (C). ηa G' and G” under a low shear stress decreased with increasing water content. From the measurement of the frequency dependence of G' and G”, a relaxation relating to the internal network structure formed by the MMPs was observed, and the strength of the relaxation became smaller with increasing water content.
Although there was no relationship between the amount of binder adsorption and the water content, it was found that the molecular weight (MW) distribution of the free binders in the paints varied with the water content : Higher MW component had the tendency not to be adsorbed easily on MMP surface as the water content increased.
Frequency dependences of G' and G” for magnetic tapes made from the magnetic paints were obtained as master curves. G' and G” of the tapes increased with increasing water content, and it was noted that paints with smaller G' and G” formed coatings having larger G' and G”, and vice versa. The electrical property of the tapes strongly depended upon the surface roughness of magnetic coating, which closely related to the behavior of both G' and ηa recovery of the paints. Thus, the paints with higher fluidity had better leveling property and formed more elastic coatings.
As a result, the variation of water contents of MMPs strongly affected the rheological properties of the paints and tapes, and changed the tape performances, such as magnetic, electrical, and physical properties.View full abstractDownload PDF (1233K) -
Hitoshi UE, Hideo TOKO1994 Volume 67 Issue 1 Pages 24-27
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
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Toshihiro KUBOTA1994 Volume 67 Issue 1 Pages 28-36
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
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Classification of Japanese “Rakugo” art by using multivariate methodsEitaro MASUYAMA, Toshiko OMATA, Masahiko KATSUMI1994 Volume 67 Issue 1 Pages 37-43
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
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Gennosuke TAKAHASHI1994 Volume 67 Issue 1 Pages 44-51
Published: January 20, 1994
Released on J-STAGE: November 20, 2012
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