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Volume 13, Issue 135
Displaying 1-7 of 7 articles from this issue
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The Apparatus for the Measurment of Viscoelasticity and the Viscoelastic Property of Casein SolutionNoboru Nishida, Hiroko Urashima, Motozo Kaneko, Jiro Furuichi1956 Volume 13 Issue 135 Pages 277-282
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe comparatively simple apparatus for measuring viscoelastic property of polymer-solution is made.This is composed of the vibrator which is a thin glass plate driven by the electromagnetic method and the A.C.bridge by which the electric impedance of the vibrator is measured.The dynamic viscosity and rigidity of specimens are calculated from the electric impedance of the vibrator, The values of viscosity obtained by this apparatus for a series of aqueous solutions of grycerin covering from0.1poises to12.7poises are in good agreement with those obtained by the ordinary method.The5-11%aqueous solutions of casein are measured by this apparatus and it is verified that this solution has the viscoelastic property and it depends upon PH of solutions.View full abstractDownload PDF (2127K) -
Tatsuro Kawaguchi1956 Volume 13 Issue 135 Pages 283-287
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe dynamic and dielectric properties of polycapramide have been measured over a wide temperature range (-60°C to 200°C); these two properties were found to be intrinsically correlated. In this temperature range three dispersion regions were observed. The changes in dynamic modulus, and the associated mechanical loss maxima, which occur at about-45°C and 80°C are discussed in relation to the chemical structure of the polymer. The higher temperature dispersion region is attributed to the hydrogen bond, and another dispersion is associated with the dipole interaction between the amide linkage.View full abstractDownload PDF (765K) -
Kotaro Tanimoto, Teruya Nemoto, Tsutomu Akita1956 Volume 13 Issue 135 Pages 288-294
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSA rapid and convenient analytical method was described for the determination of methylated methylol group in the melamine-formaldehyde resin solutions. The determination was made by modified iodometry which follows to the hydrolysis with dilute sulfuric acid. The procedure was first studied on hexamethyl ether of hexamethylol melamine, and then applied to the more complicated resin solutions. Free methanol interferes the hydrolysis, and must be removed previously under vacuum.The precision of this method is within 1% and the accuracy is generally within 3% for samples of simpler compositions.View full abstractDownload PDF (1015K) -
XIII. The Rate Equations for Cationic PolymerizationMinoru Imoto1956 Volume 13 Issue 135 Pages 295-304
Published: July 25, 1956
Released on J-STAGE: February 18, 2011
JOURNAL FREE ACCESSThe over-all rate of cationic polymerization can be expressed by the equation:
R0=k [M] g [C]
where k and g are constants, M and C the concentrations of monomer and catalyst.As the values of g, 0-3 can be seen in literature. Summarizing the submitted mechanisms of initiation and termination, the following table was derived by simple kinetic calculations.View full abstractDownload PDF (941K) -
VI.Effects of the Addition Compounds on the Degradation of PVC by MasticationKunio Goto, Hidemaro Fujii1956 Volume 13 Issue 135 Pages 305-310
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSAuthors have reported in previous papers that the size and shaps of PVC chain were changed by mastication.In this paper, the degradation of PVC included the addition compounds, plasticizer and stabilizer etc., was studied by means of viscometry and the results are discussed.View full abstractDownload PDF (809K) -
VII.Change of the Intrinsic Viscosity with the Weight Fraction of Polymer Homogenious SeriesKunio Goto1956 Volume 13 Issue 135 Pages 311-316
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSSome fractionated PVC, masticates and unmatsticates, were provided in order to confirm the results in previous paper. These fractions were selected adequately two by two, and were mixed.As a results of the viscosity measurements of each groups, in general, intrinsic viscosities were averaged to the weight fraction of each components.However, it was found that a group contained the branched molecule has a maximum value on the intrinsic viscosity at any components.View full abstractDownload PDF (709K) -
Seizo Okamura, Takuhiko Motoyama1956 Volume 13 Issue 135 Pages 317-322
Published: July 25, 1956
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe initial rates of the solution polymerization of methyl methacrylate and of vinyl acetate are compared in the completely homogeneous phase using benzoyl peroxide, azo-bis-isobutyronitrileand ammonium persulfate as the polymerization initiators. No such a great difference was found in the initial rates and also in the degree of polymerization as reported by R. Sengupta and S. R. Palit. Thus the theory postulated by W. D. Harkins was comfirmed and the characteristics of emulsion polymerization should be in the locus of reaction, not in the kind of the initiators used.View full abstractDownload PDF (769K)
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