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Volume 14, Issue 144
Displaying 1-8 of 8 articles from this issue
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Yasaku Wada, Minoru Oda1957 Volume 14 Issue 144 Pages 171-175
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSA formula which gives (p+c) from the density-regain curve of a fibre was presented; p (penetration factor) being the mass ratio of water sorbed inside of the fibre to the totalsorbed water and c (contraction factor) being the volume contraction of water sorbed outside of the fibre of unit mass times the density of free water. The variation of (p+c) with regainwas computed for cotton, wool, silk, rayon and synthetic fibres and the sorption properties of these fibres were discussed. The discrepancy between the densities measured in water andorganic liquids respectively was also discussed and it was concluded that c should be considerablysmaller than p.View full abstractDownload PDF (698K) -
Tatsuro Kawaguchi1957 Volume 14 Issue 144 Pages 176-183
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSA simplified model for a network structure of the fiberforming substance has been proposed, and relation between the mechanical properties and draw ratio has been investigated. It hasbeen assumed that the mechanical properties are principally determined by the orientationdegree, and that the influences of crystallization and other internal energy changes can beneglected comparing with this orientation effect. From the consideration of the model followingresults are obtained: Young's modulus (E) increases with increasing draw ratio, and itsasymptotic upper limit is (5E0), where E0 is Young's modulus of the isotropic body. On theother hand torsional modulus (n) decreases with increasing draw ratio. The completely orientedamorphous polymer exhibits zero torsional modulus, The ratio (E/3n) is unity only for aisotropic material with a Poisson's ratio of 1/2. Finaly this results are compared with themechanical properties of Nylon and Polyethylene Terephthalate which were observed.View full abstractDownload PDF (1000K) -
Yukisaburo Yamaguchi, Yoshiyuki Yoshida1957 Volume 14 Issue 144 Pages 184-190
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe formula for the stress relaxation in fibers was derived from the creep formula whichwas reported in the previous papers, and discussed in relation to the results of stress relaxationtests on Viscoserayon and Nylon. The formula obtained is where σ is the stress at time t in sec. after giving σ0 constant elongation, 60 is the initialstress, a is delayed time in sec. due to inertia, E is the modulus of elasticity in Olen, and b is the creep constant in strain/(g/den. log10 t).View full abstractDownload PDF (994K) -
V. Redox Polymerization Initiated by K2S208-NaHS03 SystemAkira Takahashi, Isamu Yamazaki1957 Volume 14 Issue 144 Pages 191-195
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSIn the acrylonitrile polymerization initiated by K2S208-NaHSO3 redox recipe, the monomerconsumption rate was measured in the various NaHSO3 concentrations in order to determineits critical concentration under the various conditions. It was found to be 3.6×10-4mol/l inthis experimental condition.View full abstractDownload PDF (860K) -
VI. Redox Polymerization Initiated by K2S208-Ethanol Amines SystemIsamu Yamazaki1957 Volume 14 Issue 144 Pages 196-202
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSIn acrylonitrile polymerization initiated by K2S208-ethanol amines in acqueous medium, itwas found that the monomer consumption rate was proportional to the 1/2 power of ethanolamine concentration and to the first power of acrylonitrile concentrations. The kinetics ofthe polymerization was discussed with the mechanism in which some part of ethanol amineaccelerates but other excess part retards the monomer consumption rate by participating inthe terimination reaction.View full abstractDownload PDF (1103K) -
I. Effect of Dissolving Temperature and Time on the PAN-DMF ViscosityTakashi Shibukawa, Kohei Nakaguchi1957 Volume 14 Issue 144 Pages 203-209
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSPolyacrylonitrile (PAN) was dissolved on dimethyl formamide (DMF) at the temperatureof 40, 100, 140°, and viscosity measurement was carried out at 30°. In the case of thedissolution at 40°, the intrinsic viscosity [η] of the solution decreases gradually with time andafter about 8 hrs. it reaches a constant value. At 100°, [η] decreases distinctly with time. The former phenomena may be attributed to the strong entanglement of the polymer molecules. It is, therefore, necessary for long time to get the stable viscosity values of the solution at 40°. The latter will be due to the collapse of the macromolecule. Huggins' constant k′ decreases with the increasing of the dissolving temperature.View full abstractDownload PDF (1168K) -
II. Studies of Change of Structure on the Drying Temperature of Polymer by Viscosity MeasurementTakashi Shibukawa, Kohei Nakaguchi1957 Volume 14 Issue 144 Pages 209-213
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe polymer was dried under the following conditions; 7-10 mmHg, 12hrs., 50, 100, 125, 150°, and the viscosity of these solutions was measured. The higher the temperature of drying, the more discolouration of the polymer solution was observed. And [η] of the solutionincreases with the increasing of the temperature. Huggins' constant k′ also becomes greater. The polymer dried at 150° are insoluble in part and the viscosity of the dissolved polymerwas very high. This fact may be considered to show the formation of the net-work structure. By the studies of infra-red and ultra-violet absorption spectra, the changes of the structureare considered.View full abstractDownload PDF (921K) -
III. The Evidence of Cross-linking of Polyvinyl Acetate by the Polarographic Determination of 1, 2-Glycol in Polyvinyl AlcoholSaburo Imoto, Junji Ukida, Tsugio Kominami1957 Volume 14 Issue 144 Pages 214-218
Published: April 25, 1957
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESS1, 2-Glycol in polyvinyl alcohol can be determined polarographically by the measurementof the residual periodate ion after the reaction between polyvinyl alcohol and periodate. When polyvinyl acetate was reacted with radical source as benzoyl peroxide, the cross-linkingfrom the abstraction of the tertiary hydrogen atom in the polymer unitwas found by the determination of 1, 2-glycol. Consequently, it hasbeen shown that the branching in polyvinyl acetate is given occasionallyon“backbone”chain, although the acetyl group is the principal site of bracnhing.View full abstractDownload PDF (874K)
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