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Volume 53, Issue 5
Displaying 1-9 of 9 articles from this issue
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Weigang Xu, Shigeo Asai, Masao Sumita1997 Volume 53 Issue 5 Pages 174-182
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSThe assignments of FTIR and Raman spectra of poly (vinyl alcohol) (PVOH) and four ethylene vinyl alcohol (EVOH) copolymers 72, 59, 44, and 32mole% of ethylene group, has been performed by in-situ measurements and deconvolution analysis. By comparing with the spectra of high-density polyethylene, the bands in the region of 1000_??_1200cm-1 was classified into the C-C and C-O stretching vibrations. It was found that the C-C stretching vibration of PVOH and EVOH copolymers is affected significantly by disordered distribution of hydroxy group and crystallinity.View full abstractDownload PDF (667K) -
P. W. Gibson, M. Charmchi1997 Volume 53 Issue 5 Pages 183-194
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSA comprehensive numerical model developed for the coupled transport of energy and mass through porous hygroscopic materials was integrated with an existing human thermal physiology model to provide appropriate boundary conditions for the clothing model. The human thermal control model provides skin temperature, core temperature, skin heat flux, and water vapor flux, along with liquid water accumulation at the skin surface. The integrated model couples the dynamic behavior of the clothing system to the human physiology of heat regulation. This model provided the opportunity to systematically examine a number of clothing parameters, which are usually not included in steady-state thermal physiology studies, and to evaluate their potential importance under various conditions of human work rates and environmental conditions.View full abstractDownload PDF (874K) -
Ryohei Fukae, Tohei Yamamoto, Hitoshi Masago, Nobuhiro Kawatsuki, Osam ...1997 Volume 53 Issue 5 Pages 195-203
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSDynamic viscoelasticity of poly (vinyl alcohol) (st-PVA) with high syndiotacticity (diadsyndiotacticity > 61%), which is derived from vinyl pivalate, was investigated to compare with that of commercial atactic PVA (at-PVA, diad-syndiotacticity=54%). Cast films of at-PVA with Dp of 1, 800 (at-L), st-PVA with Dp of 1, 700 (st-L) and st-PVA with Dp of 12, 500 (st-H) were prepared and annealed to provide for the desired crystallinity. at-L and st-L show four damping dispersions, i.e., βa, αa, βc, and αc, on their tanδ curves. βa and αa relaxations are mechanical damping of amorphous regions, whereas βc and αc are those of crystal regions. Dynamic storage modulus E' of (st-L) s increased with increasing crystallinities and could exceed E' of (at-L)s at temperatures beyond αa dispersion region. In particular, st-L having a crystallinity more than 50% holds E' of 109 Pa order of magnitude at temperatures above 100°C. The higher value of E' throughout the temperature ranges of glass transition-, rubbery plateau- and crystal relaxation-regions were observed when st-PVA films were drawn by 4 time the length at 180°C . In this case, tanδmax(Tg) of st-PVA shifted to a higher temperature than that of at-PVA. There are no marked differences in the changes of E' and tanδ between st-L and st-H. The effects by water swelling against amorphous region, sizes of crystallites for at-PVA and st-PVA on the dynamic viscoelastic behaviors were discussed.View full abstractDownload PDF (634K) -
Ayako Inamura, Masako Niwa1997 Volume 53 Issue 5 Pages 204-210
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSIn the performance design of power-net fabric having high formative and vibration-proof effects, prediction of extension properties caused by clothing pressure is one of the most important problem. The method of linearizing non-linearlity of a fabric assembly, proposed by S. Kawabata in 1986, has been applied to predict extension property of a power-net fabric having strong anisotropy and non-linearity along the wale and course directions. Optional strain parameters n1 (i=1, 2, 1 and 2 are the wale and course directions, respectively) are introduced to transform to stress-strain curves for a linear relation. It is shown that the linearization method is able to estimate stress-strain curves on optional deformation modes from biaxial extension to uniaxial one.View full abstractDownload PDF (485K) -
Tetsuya Tanigami, Koji Yamazaki, Keiko Yano, Kazuo Yamaura, Shuji Mats ...1997 Volume 53 Issue 5 Pages 211-214
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSCase II diffusion of dimethylsulfoxide and water (90/10 (vol%)) mixed solvent through a poly (vinyl alcohol) film at 40°C was investigated. A diffusion front was observed at the inter-face of the swollen layer and the unswollen glassy core and it was found that the motion of the diffusion front obeyed the Case II mechanism. Cracking was observed in the core at the late stages, which should induce the Super Case II process. This cracking is supposed to be caused by expansive force of the swollen layer.View full abstractDownload PDF (1102K) -
SHUNJI NOMURA, KEISUKE KAJI1997 Volume 53 Issue 5 Pages P129-P131
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
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KEISUKE KAJI1997 Volume 53 Issue 5 Pages P132-P136
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSDownload PDF (2814K) -
Ultrafine Structures in Synthetic Fibers Studied by Electron Microscopy and/or STM/AFMMASAKI TSUJI, TOSHIKI SHIMIZU1997 Volume 53 Issue 5 Pages P137-P141
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
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TETSUNORI HIGUCHI1997 Volume 53 Issue 5 Pages P142-P144
Published: May 10, 1997
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSDownload PDF (1416K)
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