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Volume 13, Issue 139
Displaying 1-7 of 7 articles from this issue
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Yasuyoshi Sakaguchi1956 Volume 13 Issue 139 Pages 461-470
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSUnder the assumption that the chemical linkage of unbranched polymers was attacked only when it was situated in the amorphous part of crystalline polymers, the rate of decomposition, the distribution of the polymerization degree of the decomposition product and the average degree of polymerization were calculated. U= (weight average DP)/(number average DP)-1, a measure of the heterogeneity increases, by random decomposition, with the increasing degree of the decomposition, passes a maximum and then decreases, while in the present case U vers decomposition curve has a maximum and a minimum. When the decomposition degree is the same and not so high, the weight average DP of the both random and selective decomposition product is similar.View full abstractDownload PDF (1579K) -
Takao Yamaguchi, Miaki Yamamoto1956 Volume 13 Issue 139 Pages 471-476
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSViscosity of various kinds of liquid was measured by means of damping and resonance frequency method making use of magnetostrictive type viscometers of vibrating frequency about 24 kc. The results of calculations and experiments coincided exactly when the resonance frequency method was used. However, viscous silicon oils showed considerable visco-elasticity, and the value of viscosity obtained by measurement was very low. When those oils were measured by other type viscometer of visbrating frequency approximately 600 cycles per second, the results did not revealed such visco-elasticity at all.View full abstractDownload PDF (889K) -
I. Drawing and Orientation of Model FilamentsYasuo Shinohara, Hiroshi Tanzawa1956 Volume 13 Issue 139 Pages 477-483
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSIsotropic model filaments of viscose were drown on the coagulated, regenerated and dried states respectively, and the degree of the deformation and the orientation was observed. The relations between the orientation factor f and the drawing ratio vt as referred to the dry state depended upon the state of drawing (swelling degree), but not the other drawing conditions (thickness of filament, drawing speed, fixed time, drawing temperature, drying temperature etc.). It was found that the higher the degree of filament swelling when drawing, produced a higher degree of orientation on the dry state.View full abstractDownload PDF (803K) -
I. The Trial Manufacture of the Crease Recovery Tester and its ResultsYukichi Go, Megumu Suzuki, Kiyoto Haba1956 Volume 13 Issue 139 Pages 484-490
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe crease recovery measurement was tried with many methods, but it is difficult problem because the crease have many factors. Recently, for the purpose of to know the crease recovery, the openning angle measurements were made on the folded double clothes after release of the weight. But also this method is complicated.Monsanto type crease recovery tester is better than the former method as it has a few affects of self-weight in test piece. Each, however, the making part of crease and the measuring part of crease angle, is not connected in this method. We must move manually a test piece by hands or a pinsette. We, therefore, improved K.S.crease recovery tester, one of the Monsanto type crease recovery tester, which had little manual effect, and measured the recovery angle by this simple method at natural state. Then several plain clothes were experimented with this improved tester, and considered mechanically about the results.View full abstractDownload PDF (1136K) -
II. Inhibition Effect of Phenyl-β-naphthylamine on the Oxidation of PolyethyleneSyunji Kawamatsu, Minoru Harada1956 Volume 13 Issue 139 Pages 491-496
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe effects of Phenyl-β-naphthylamine on the oxidation of Polyethylene were measured with the wolfram-spring balance method. At 116°C, the induction period increased logarismically with the concentration of the inhibitor, and linearly increased at 125-445°C. The oxidation rates decreased with the inhibitor added. The activation energies calculated from the apparent rate constants of the oxygen absorption were found 35kcal/mol at lower temperatures than 130deg;C, and 15 kcal at higher temperatures.These values must be corrected by the diffusion of oxygen through the samples and by formation of volatile materials of which main portion is water. The oxygen absorption rates were generally proportional to the square root of the oxygen pressure.View full abstractDownload PDF (691K) -
II. Solubility and Swelling Property of Vinyl and Isopropenyl Alcohol Copolymer Films in WaterGisaku Takahashi, Ichiro Sakurada1956 Volume 13 Issue 139 Pages 497-502
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSCopolymers of vinyl alcohol and isopropenyl alcohol (P-PVA) were prepared by the saponification of copolymers of vinyl acetate (M1) and isopropenyl acetate (M2). The initial concentration ratio [M1] 0:[M2] 0 were 98: 2, 95: 5, 90: 10 and 80: 20. The solubility and swelling property of P-PVA films in water at 30 and 50°C were measured after heating at 100, 120, 140, 160, and 180°C. Properties of P-PVA films are similar to A-PVA (copolymers of vinylalcohol and allyl alcohol) films and more easily soluble and swellable in water than ordinary PVA films.View full abstractDownload PDF (956K) -
III. Stability of Vinyl and Allyl Alcohol Copolymer SolutionGisaku Takahashi, Ichiro Sakurada1956 Volume 13 Issue 139 Pages 502-506
Published: November 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSCopolymers of vinyl alcohol and about 1, 3 and 5 mol% allyl alcohol (A-PVA) were prepared by the saponification of copolymers of vinyl acetate and allylacetate. The aqueous solutions containing 5, 10 and 15g A-PVA in 100cc solution were prepared, viscosity of the solutions with time were measured by standing at 15, 10, 5 and 0-C respectively, and compared with that of polyvinyl alcohol. These A-PVA solutions are very stable, and viscosity increase by standing is very small compared with polyvinyl alcohol solutions.View full abstractDownload PDF (815K)
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