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Volume 38, Issue 4
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1982 Volume 38 Issue 4 Pages T191b
Published: 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (55K) -
1982 Volume 38 Issue 4 Pages T191a
Published: 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (55K) -
Masayuki Hayashi, Ryouichi Katou, Tetsuya Sakai1982 Volume 38 Issue 4 Pages T147-T152
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSFilms of poly (p-phenylene terephthalamide) (PPTA) were prepared by immersing glass tubes which were dipped in a concentrated sulfuric acid solution of PPTA in water or in methanol. The polar component of surface tension of the film coagulated in water differed from that of the film obtained in methanol. This difference was considered due to the fact that the direction of the intermolecular hydrogen bonding against the film surface was perpendicular when films prepared in water and parallel in methanol.View full abstractDownload PDF (1860K) -
ORIENTATION BEHAVIOR AND MECHANICAL PROPERTIESJiro Shimizu, Norimasa Okui, Takashi Yamamoto, Masaki Ishii, Akira Tak ...1982 Volume 38 Issue 4 Pages T153-T162
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSMelt-spinning experiments were carried out to investigate the effect of blend ratio and take-up velocity on the mechanical properties of the polymer blends. Ultra-fine fibrils having several hundred Å in diameter and ca. 105 in aspect ratio are oriented along the extrusion axis and dispersed uniformly in the cross section of the blend filaments.
The following results were obtained.
1) Birefringence and Young's modulus of each component polymer in the resultant blend filaments were estimated on the basis of the linear relationship between birefringence and Young's modulus for each homopolymer of the filaments obtained by the melt-spinning of PP and PS.
2) Orientation of PP component decreases with an increase in PS content. Orientation of PS component is independent of the composition where PS component is formed as a continuous phase and shows the same orientation as that of pure PS filament obtained at the same take-up speed. In the range of the composition where PS is formed as a dispersion phase, orientation of PS increases drastically with a decrease in PS content.
3) For the tenacity of the blend filaments, the transition of ductile to brittle is clearly observed at the critical PS composition V*PS The relationship between the tenacity and the blend ratio can be expressed by means of two straight lines, which lines cross with each other at the V*PS where a fracture mechanism of the blend filament is changed.
4) In order to discuss the relationship between the tenacity and the blend ratio, the effect of the blend ratio on orientation properties of each component of PP and PS must be taken into account. Such a treatment is actually valid in explaining the fracture mechanism of the blend filaments on the basis of the simple composite model, namely parallel model.View full abstractDownload PDF (1253K) -
Atsushi Suzuki1982 Volume 38 Issue 4 Pages T163-T170
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThere is a close relation between damp or oppressive sense and water content of fabrics. The differences in the critical water content of damp sense of fabrics among fibers have been suggested as one of major factor when we discuss comfortable use of fabrics. The relation between the subjective rating of critical water content of damp sense and the experimental results of fabrics was mainly discussed in this paper.
That is to say, results of sensary test of four kinds of knit fabrics, polyester, acrylics, wool and cotton, on damp and oppressive sense were compared with those measured by both the sliding resistance of water sorbed fabrics to a metal, from which the clingy forces were assessed, and the changes of the temperature and the heat flow in drying. The relationship were mainly investigated between the critical water content of damp sense, the effects of water content to the clingy forces and the temperature or the heat flow. It was found that the critical water content of damp sense was characterized by the critical water content where the clingy force showed the remarkable increase, and the so called the second critical water content in the falling-rate period of drying.View full abstractDownload PDF (553K) -
Sukenori Shintaku, Genichi Yoshimura, Nobuo Iwaki1982 Volume 38 Issue 4 Pages T171-T177
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe mechanical properties of a covered yarn consisting of spandex core are dependent on the helix angle of the covering yarn in manufacturing. This angle is determined by the yarn diameter, the core velocity and the angular velocity of the spindle at which the covering yarns are wound on the core. The velocity of the spindle causes the covering yarn to form what is known as a balloon at the covering process. The tension of the covering yarn has an influence on the helix angle.
The tension was analyzed from the relations of the balloon properties with the mass per unit length of the yarn and of the effective diameter with the air drag and the bobbin radius.1) The results well reproduced the balloon of the filament yarns, but in case of the cotton yarns, the tangential air drag, which had been neglected for analyzing filament yarns, was to be taken into account.View full abstractDownload PDF (388K) -
ISAO IKEDA, KIMIHIRO SUZUKI1982 Volume 38 Issue 4 Pages P176-P182
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (447K) -
Jiro Seta, Taisuke Ito1982 Volume 38 Issue 4 Pages T178-T182
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDiffusion coefficient D of Chrysophenine G (C. I. Direct Yellow 12) (DY 12) in cellophane (CELL.) was obtained by the multiple membrane method and under high hydrostatic pressures up to 2.5kbar. The pressure dependence of D was analysed and discussed in terms of the activation volume ΔV_??_ for diffusion obtained by where R, T and P are the gas constant, the absolute temperature and the pressure, respectively. The pressure effect was not large at 100°C, where ΔV_??_ was found to be 18cm3/mol. This amount was only 4% of the effective volume of DY 12, 430cm3/mol. Based on the free volume theory, it was concluded that CELL, was swollen with water and the mean free volume in the initial state was almost sufficient to accommodate the diffusing penetrant, i.e., a large local volume expansion by fluctuation was not needed for activation.View full abstractDownload PDF (403K) -
Ritsuko Nakamura, Mitsuhiko Hida1982 Volume 38 Issue 4 Pages T183-T190
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSLightfastness of basic dyes and cationic dyes depends on substrates surrounding dyes. In order to learn origin we studied the photoreaction of Crystal Violet (CV) in alcohol and acetonitrile solutions as a model of substrate. Under degassed condition the photoreaction of CV was reduction to give its leuco compound in all used solvents. The photoreaction showed a remarkable dependence on wavelength of irradiated light, and CV excited state with ultraviolet irradiation is more active than that with visible light. In aerated solvents the photoreaction of CV was oxidation in acetonitrile, while reduction in alcohol.View full abstractDownload PDF (448K) -
TOSHIO NISHI1982 Volume 38 Issue 4 Pages P183-P189
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
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YOSHIAKI OHYABU1982 Volume 38 Issue 4 Pages P190-P195
Published: April 10, 1982
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (466K)
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