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Volume 17, Issue 181
Displaying 1-10 of 10 articles from this issue
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II. On the Self-Condensation Rate of Bis (β·hydroxyethy1) terephthalateMisao Sumoto, Ryozo Inoue1960 Volume 17 Issue 181 Pages 285-288
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAt the cases of bis (β·Ehydroxyethy1) terephthalate only and coexistence with a small amount of ethylene glycol, we determined the condensation reaction rate of the sample through analysis of ethylene glycol resulting from the self-condensation reaction. From the results of these experiments, we obtained unity for the equilibrium constant, same as the report 1. On the conditions of relative lower temperatures and earlier stages of the condensation reaction, considerably good agreement for reversible bimolecular rate equation is given. But in relative higher temperatures, harf ester of ethylene glycol was unstable and the existence of carboxyl and aldehyde groups has been confirmed. We discussed the relations between activation energy and G, this concerned to the concentration of polar groups in the reaction systems.View full abstractDownload PDF (939K) -
X. Creep and Stress Relaxation of YarnsMegumu Suzuki1960 Volume 17 Issue 181 Pages 289-294
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAs the creep and stress relaxation of filament are similar to the crease and crease recovery of fabrics, the experiments of creep and stress relaxation are done, and the distribution functions of frictions between filaments in yarn are discussed in this paper.View full abstractDownload PDF (865K) -
XI. The Relaxation of Bending Moment of Bent YarnMegumu Suzuki1960 Volume 17 Issue 181 Pages 295-300
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAs the crease curve is relating to the phenomena of the bending of fabrics, an ordinary bending tester of fabrics, yarns and filaments was improved by this auther to be bent at a constant speed and curvature by means of moter driving. And the bending moment relaxation of bent yarn was studied experimentally. The distribution functions of frictions between the filaments in the bent yarn were compared with those in the elongated yarn, and it was known that the distribution functions of the frictions of the both types differed radically.View full abstractDownload PDF (2986K) -
I. An Impact Tensile TesterKoichi Nakamura, Hideo Konno1960 Volume 17 Issue 181 Pages 301-304
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAn apparatus was constructed in order to measure the tensile properties of cellulose derivatives films at rate of extension from 0.8 to 4 meters per second. The essential feature of insurment is to record automatically the load and the extension by the strain gauges and the electromagnetic oscillograph. The extension of specimen is given by falling weight.View full abstractDownload PDF (2415K) -
II. Effect of Crystallinity on Viscoelastic PropertiesYoshiko Uematsu, Tadashi Matsudaira1960 Volume 17 Issue 181 Pages 305-311
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe effect of crystallinity on the mechanical behavior was studied by the vibrating reed method. Samples of polyethyleneterephthalate were crystallized at 120°C and 225°C. Q-1 goes through a maximum at about 100°C. The temperature shift of this maximum is rapid for the sample treated at 120°C. The more crystalline samples have large dynamic moduli. Moreover the low-temperature-crystallized sample shows a large dynamic modulus for the same crystallinity. Assuming that both crystallites and entanglements physicially act as crosslinks, and taking into account the somewhat ordered amorphous region between crystallites, a the oreticale relationship of the dynamic modulus to crystallinity and size of crystallites may be established.View full abstractDownload PDF (1350K) -
III. Dynamic Modulus of PolyethyleneYoshiko Uematsu1960 Volume 17 Issue 181 Pages 311-315
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSFour samples of polyethylene which differed widely in crystallinity were studied. The crystallinity and dynamic modulus were measured from 25°C to the observed melting point. The dynamic modulus drops rapidly as the melting point is approached and the more crystalline samples exhibit larger moduli. In a previous paper we considered that both crystallites and entanglements act as physical crosslinks and took into account somewhat ordered amorphous region between crystallites. By this treatment we derived an expression relating dynamic modulus to crystallinity and size of crystallites. The same relationship was found to be applicable to polyethylene. Further, the derivation was extended to prove that the logarithm of the dynamic modulus is a linear inverse function of the specific volume.View full abstractDownload PDF (957K) -
II. Solubility and Swelling Property of Films from Mixtures of Polyvinyl Alcohol and Polyacrylic Acid in WaterHiroshi Kawakami, Kenji Kawashima1960 Volume 17 Issue 181 Pages 316-319
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSFilms were prepared from aqueous solutions of mixtures of polyvinyl alcohol (PVA) and polyacrylic acid (PA), and subjected to heat treatment at 80, 120, 160, 200°C for 10 minutes to compare density, solubility, and swelling property with pure PVA or PA films. On the films which had been heat treated at the same temperatures below 160°C, the linear relationship was obtained between the reciprocal of the density and the PA content. PA films were perfectly soluble in water even at 30°C. Films from mixtures were less soluble and swellable in water at 80°C than PVA films which had been subjected to the same heat treatments, whereas in water at 30°C the former were more soluble and swellable than the latter. The less solubility and swellability of the former in water at 80°C seems to be attributed to the inter-molecular ester linkage between hydroxyl groups in PVA and carboxyl groups in PA.View full abstractDownload PDF (871K) -
III. Inter-molecular Esterification on Heat Treatment of Films from Mixtures of Polyvinyl Alcohol and Polyacrylic AcidHiroshi Kawakami, Kenji Kawashima1960 Volume 17 Issue 181 Pages 319-324
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe content of carboxyl groups in the mixtures of polyvinyl alcohol and polyacrylic acid was determined by conductometric titration. It decreased with heat treatment of films prepared from the mixtures. The amount of inter-molecular esterlinkage between hydroxyl groups in polyvinyl alcohol and carboxyl groups in polyacrylic acid was calculated from the proportions of two polymers and the carboxyl contents in the mixtures. It varied with the proportions of two polymers. From these results, the solubility and swelling property of films which had been reported in the previous paper were discussed.View full abstractDownload PDF (1442K) -
Mitsuo Asahina, Tadayuki Tabata1960 Volume 17 Issue 181 Pages 325-328
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe dielectric properties of two kinds of polyvinyl chloride prepared at different temperatures were studied. The results show that, the dielectric transition temperature of polyvinyl chloride prepared at low temperature (low temp. PVC) is higher than the value of polyvinyl chloride prepared at high temperature (high temp. PVC), and the value of the activation energy of high temperature dispersion process of the low temp. PVC is higher than the value of the high temp. PVC, but the values of the activation energy of low temperature dispersion process of these two samples are almost identical and seem to be independent of the polymerization temperature.View full abstractDownload PDF (762K) -
Tadayuki Tabata1960 Volume 17 Issue 181 Pages 329-332
Published: May 25, 1960
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe dielectric constant and loss of Nylon 66 and Nylon 6, which were heat treated, have been measured over a wide temperature and frequency range. We observed two dielectric dispersions, and have investigated the relation between the magnitude of these dielectric dispersions and the heat treatment. And we confirmed that the magnitude of these dispersions was decreased with increasing the degree of crystallinity. It is clear that the area surrounded by the dispersion curves and base line of the dielectric dispersions decreases by further crystallization; therefore it follows that these low temperature dispersions are due to the polar groups in the amorphous region.View full abstractDownload PDF (848K)
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