Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
Volume 70, Issue 7
Journal of the Society of Fiber Science and Technology
Displaying 1-12 of 12 articles from this issue
Reviews and News
Foreword
Special Issue of Young Scientists (1)
Active Young Researchers in Fiber and Textile Fields
From Recent Doctoral Thesis
Series on Origin of Melt-Spinning Technology
Series on Culltural Tradition Associated with Festivals 9
Serise of Historical Reviews of Japanese Textile Industry Supported by the Technology-History of the Production,Sales,and Product Development-11
Original Articles
Transactions
  • Keisuke Kaneda, Keisuke Uematsu, Hiroyasu Masunaga, Yoichi Tominaga, K ...
    2014 Volume 70 Issue 7 Pages 137-144
    Published: July 10, 2014
    Released on J-STAGE: July 09, 2014
    JOURNAL FREE ACCESS
    A thixotropic gel consisted of the mixture of imogolite (IG) and maleic acid could be liquefied and re-solidified reversibly by shaking and standing, respectively, within subseconds (K. Shikinaka et al., Small, 10(9), 1813 (2014)). After flow-orienting and subsequent standing the sol-state mixture, the uniaxial alignments of IG hollow nanofibers with centimeter scale were realized in the recovered gel. The degree of orientation of IG was noticed to be dependent on the flow velocity of the sol-state mixture. The self-standing interpenetrated network gels with the desired shapes were prepared by the in situ polymerization of the uniaxially oriented gels that were pre-impregnated by 2-hydroxyethyl acrylate and a cross-linker. The confinement of the IG hollow nanofibers with the uniaxial orientation induced some anisotropic physical properties to the gels such as anisotropic proton conductivity and mechanical strength.
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  • Toshiko Amemiya, Tadashi Nakanishi
    2014 Volume 70 Issue 7 Pages 145-151
    Published: July 10, 2014
    Released on J-STAGE: July 09, 2014
    JOURNAL FREE ACCESS
    Mordant-dyed cotton and wool fabrics were prepared with direct and basic dyes, and copper(II) sulfate. The deodorization rates for ethanethiol by the mordant-dyed samples were measured by gas detection tube method and gas chromatography of flame photometric detection. The deodorization processes had two phases. For mordant-dyed cotton samples, the deodorization rates of the initial phase were fast, and of the successive second phase were low (fast-slow type). To the contrary, the mordant-dyed wool samples indicated slow-fast type of the deodorization rates. Comparison of the deodorization behaviors of the cotton and wool sample fabrics revealed the large difference in the state of copperions adsorbed by the fabrics.
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  • Kyohei Joko, Hiroshi Takahashi, Yasushi Takeda, Atsushi Osaki
    2014 Volume 70 Issue 7 Pages 152-159
    Published: July 10, 2014
    Released on J-STAGE: July 09, 2014
    JOURNAL FREE ACCESS
    Effects of the reducing agents such as ammonia thioglycolate (ATG), L-cysteine (CYT), cyisteamine (CYA) and 2-mercapto-4-butanolide (BLT) on disulfide (-SS-) cross-links in microstructure surrounding the intermediate filaments (IFs) were investigated by analysis of a crystal denaturation behavior of intact and reduced human hairs using High pressure differential scanning calorimetry (HPDSC) and ambient pressure DSC (APDSC). Their reduced hair samples which sulfhydryl groups caused by a reduction reaction were blocked by N-ethyl maleimide (NEMI) were measured by these DSC techniques. The results have shown that ATG diffuses easily into the cortical cells and then dissociates some -SS- linkages in microstructure surrounding IFs, in contrast, and that the other reducing agent hardly acts to cleave the -SS- bonds in microstructure surrounding IFs. However, it was found that if the cortical cells mechanically crushed using the rotary speed mill were treated with CYT, CYT diffused easily the cortical cells and then dissociated some -SS- cross links in microstructure surrounding IFs. It has been believed from the above findings that CYT, CYA and BLT acts primarily to attack the -SS- bond in the cuticle cell layer. When comparing of the -SS- + -SH groups contents of hair samples reduced with ATG and CYA for different time, it was revealed that -SS- + -SH groups contents of both treated hair became almost constant at 10 min treatment, and furthermore that the equilibrium value of the ATG treated hair was only slightly higher than that of the CYA treated hair. This finding suggested that the amount of -SS-bond cleavage in the cortical cells by ATG treatment was considerably less. As a result of evaluating the permanent wave shape formed by the reducing agent of four under certain conditions based on the knowledge obtained above, it is concluded as follows: (1) Permanent efficiency of wave shape is attributed to the rearrangement of the molecular chains that make up the cuticle cell, which is induced by the -SS- linkage cleavage of exocuticle generating a strain by being wrapped on the rod. (2) The difference of the wave efficiency depending on the type of the reducing agent is due to differences in the permeability of these into cuticle cells.
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  • Takeshi Ogino, Hiroshi Tanaka
    2014 Volume 70 Issue 7 Pages 160-166
    Published: July 10, 2014
    Released on J-STAGE: July 09, 2014
    JOURNAL FREE ACCESS
    We have conducted an experimental study on heat and moisture transfer from the unsteady state to the steady state by simultaneously comparing a hygroscopic fiber and a non-hygroscopic fiber. For correct verification of this phenomenon, we measure temperatures on the surfaces of each sample by using a thermography camera instead of point -contact thermocouples and visualizing the entire surfaces of each sample, and thereby observe changes of temperature distribution on the entire surfaces of each sample. We also evaluate how the differences in serial temperature distribution in each sample are related to the temperature and humidity around the interface between chambers, and further consider a relevance to heat-retaining property.
    In addition to, we attempt to the numerical analysis to clarify the mechanism of this phenomena using the adequate analytical model. Numerical results show the same qualitative tendency assuming the remaining of the adsorption and desorption effect only at the front and back side of sample, even though the sample have been attained adsorption equilibrium , thus suggesting an improvement in heat-retaining properties.
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