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Volume 32 (2004)
- Issue 5 Pages 235-
- Issue 4 Pages 155-
- Issue 3 Pages 113-
- Issue 2 Pages 65-
- Issue 1 Pages 3-
Volume 32, Issue 2
Displaying 1-7 of 7 articles from this issue
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Original Articles
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Akihiro Nishioka, Mihoko Nishio, Tatsuhiro Takahashi, Kiyohito Koyama2004 Volume 32 Issue 2 Pages 65-69
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSThe role of ion aggregates in EMAA ionomers on elongational viscosities under uniaxial, biaxial and planar was investigated. Firstly, measurement technique of biaxial and planar elongational viscosities for EMAA ionomers can be optimized due to its difficulties. After optimization, uniaxial, biaxial and planar elongational viscosities of ionomers were obtained. It was considered that effects of ion aggregates can not be appeared under uniaxial deformation in all of strain rates region. On the other hand, it was found that behavior of ion aggregates was changed under biaxial and planar deformations. It was considered that behavior of ion aggregates may be changed by two factors, deformation type and degree of strain rates.
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Ming-Hung Wu, Ken'ichi Koseki, Takeshi Amari2004 Volume 32 Issue 2 Pages 71-78
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSThe surface relationship between the orientation structure of liquid crystal molecules and the polymeric alignment layer was investigated by a slit-flow viscometer. In this study, an experimental determination is described for the direct measurement of the anisotropic viscosities of liquid crystals without a magnetic field. In addition, the effects on apparent viscosity for nematic and smectic liquid crystals caused by various rubbing depths on the alignment layer, and the gap dependence of apparent viscosity for smectic liquid crystals were also investigated. With increasing rubbing depth, the apparent viscosity of nematic liquid crystals on both parallel and perpendicular orientations becomes higher. And the apparent viscosity of smectic liquid crystals also becomes higher on parallel orientation, but becomes lower on perpendicular orientation. Furthermore, the rubbed surface of the alignment layer was observed using an atomic force microscope (AFM), and the orientation structures of smectic liquid crystals in the slit cell were elucidated.
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Kazuyuki Shohara, Kousuke Uotani, Hideki Yamane2004 Volume 32 Issue 2 Pages 79-84
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSInfluence of surface treatment and crosslinking density on the rheological and mechanical properties of silicone resin filled with silica particles was investigated. Although addition of particle in the liquid silicone matrix increased the storage modulus G' and the complex viscosity |η*| especially at a low frequency region, surface treatment of particle suppressed such tendency. On the other hand, surface treatment increased the storage modulus E' and the tensile modulus E of crosslinked elastomers. Particle unfilled silicone elastomer showed an increasing storage modulus with temperature at a rubbery region behaving as an entropy elastomer and highly particle filled elastomers showed a decreasing storage modulus indicating an enthalpy elastic character. However silicone elastomers with small particle content changed their character from entropy elastic to enthalpy elastic with increasing crosslinking density.
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Kazunori Yasuda, Takashi Koshiba, Noriyasu Mori2004 Volume 32 Issue 2 Pages 85-90
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSIn the present paper, to elucidate effects of the formation and breakage of filament on the dip coating process in the manufacturing of capsules, we measured the filament length between the tip of the coated rod and the liquid surface when the filament broke, and examined the dependence of the filament length on the rheological properties of coating liquids and withdrawal velocity to optimize the dip coating process. The coating liquids were aqueous solutions of syrup as Newtonian liquids and mixture liquids of aqueous solutions of syrup and water-soluble polymer (polyacrylamide) as polymeric liquids.Consequently, it is found that a large withdrawal velocity brings a shorter time at the filament breakage in Newtonian liquids regardless of their shear viscosities. The experimental equation which represents the relation between the breakage length of the filament and the shear viscosity of the coating liquid are presented. In polymeric liquids, a large elongational viscosity causes a large filament length.The large withdrawal velocity was ineffective upon the reduction of the breakage time of the filament. The use of polymeric liquids with large spinnability reduces the efficiency of manufacturing in dip coating process. The normal stress difference of the coating liquid reduces the coating thickness, so that the coating liquid containing polymer is required to have a small spinnability and a moderate normal stress difference.
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Win Shwe Maw, Tsutomu Takahashi, Masataka Shirakashi2004 Volume 32 Issue 2 Pages 91-96
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSThe validity of potential flow analogy by the Hele-Shaw flow of non-Newtonian fluids is examined through experiments using two shear-thinning elastic polymer solutions for three different flow configurations, i.e. flows around a circular cylinder and a square cylinder and flows through an abruptly converging-diverging channel (slit). Although the polymer solutions are highly shear-thinning and elastic, their flows well reproduce the corresponding two-dimensional potential flow patterns of the respective flow configurations when the flow rate is very low. The deviation occurs at values of Reynolds number much lower than the critical value for inertia effect, and in the opposite way of the inertia effect. An analysis for inelastic non-Newtonian fluids shows that non-constant viscosity does not affect the potential flow analogy, and the potential flow patterns are observed at flows with considerable values of the first normal stress difference in shear flow. Therefore, the disturbance to the potential flow pattern is not due to the non-Newtonian viscosity or the elasticity in shear flow, but attributed to the elongational stress due to the elasticity of the polymer solutions.
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Haifa El-Sadi, Nabil Esmail2004 Volume 32 Issue 2 Pages 97-104
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSThis is an investigation of the effect of paper-yellowing inhibitors on the viscosity-temperature dependence; scatter particle size, and the associated changes in the surface microstructure. The temperature has no effect on the qualitative viscosity behavior of the coating formulation including inhibitors. Particles size of pigment increases with the combination of UV absorber and radical scavenger. Transmission Electron Microscopy shows the microstructure of increasing agglomerations with added inhibitors to coating mixture. Numerical 3D simulation of the flow in the coating nip of metering size press taking inertia forces into consideration depicts vortex formations on the surface of the coater's rolls.
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Rapid Communication
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Syed Atiqur Rahman, Norio Nemoto2004 Volume 32 Issue 2 Pages 105-107
Published: 2004
Released on J-STAGE: June 13, 2004
JOURNAL FREE ACCESSDownload PDF (158K)
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