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Volume 18, Issue 190
Displaying 1-9 of 9 articles from this issue
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Sadao Hayashi, Takuhiko Motoyama1961 Volume 18 Issue 190 Pages 95-98
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSSo far as learned from literature, the quantity of retained monomers in polyvinyl acetate emulsions is decided by the quantity of bromine absorbed by the retained monomers. This method, however, cannot be applied to emulsions which contain polyvinyl alcohol asa component, because this polymer absorbs bromine in the same way as vinyl acetate. From this point of view a new method has been proposed and examined. The purpose is achieved by converting vinyl monomer to acetaldehyde by caustic soda and after coloring it with benzene sulfohydroxamic acid-ferric sulfate analizing the solutions by means of colorimetry. Applying this method to polyvinyl acetate emulsions dissolved in aqueous solutions of isopropanol, the accuracy of this method was examined.View full abstractDownload PDF (562K) -
VII. Analysis of Pseudoplastic Flow through Concentric Double Tube Die for Wire CoatKensei Hayashida1961 Volume 18 Issue 190 Pages 99-102
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe pseudoplastic flow through concentric double tube for wire coating is analysed taking into consideration of the wire velocity. The relations between pressure and flow rate are illustrated for a given die dimension and wire velocities.View full abstractDownload PDF (657K) -
Wasaburo Kawai, Shigeru Tsutsumi1961 Volume 18 Issue 190 Pages 103-106
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe infra-red spectra of polymethylmethacrylate were studied for the acetone-soluble and in soluble parts of the samples prepared previously. The X-ray diffraction patterns indicate that the insoluble part is crystalline. It is seen from the infra-red spectrum that the ratio of the intensity E (1058cm-1)/E (1382cm-1) is higher in the crystalline polymer than in the acetone-soluble polymer.View full abstractDownload PDF (956K) -
Wasaburo Kawai, Shigeru Tsutsumi1961 Volume 18 Issue 190 Pages 107-109
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe infra-red spectrum of the block copolymers were investigated, which were prepared from living polyacrylonitrile with the other monomer in triethylaluminum and borontrifluoride etherate catalytic system. From the X-ray diffraction the block copolymer is found to be lower in crystalinity than polyacrylonitrile.View full abstractDownload PDF (350K) -
I. On the Average Molecular Weights Obtained from Sedimentation and Diffusion Constants of Polymer SolutionsNobuo Yamada, Hideomi Matsuda1961 Volume 18 Issue 190 Pages 110-114
Published: February 25, 1961
Released on J-STAGE: December 22, 2010
JOURNAL FREE ACCESSIt is shown that the average molecular weight MSD obtained from sedimentation and diffusion measurement (making use of Svedverg's equation) is given by the equation, γ is given by the relation, D=KIIIM-γ, between molecular weight M and diffusion constant D. Moreover, MSD, is expressed in terms of weight average molecular weight, Mw, and number average molecular weight, Mn as follows:_??View full abstractDownload PDF (787K) -
II. On the Average Molecular Weights Obtained from Sedimentation an Diffusion Constants of Polymer Solutions (Experimental)Nobuo Yamada, Hideomi Matsuda1961 Volume 18 Issue 190 Pages 114-119
Published: February 25, 1961
Released on J-STAGE: December 22, 2010
JOURNAL FREE ACCESSIn the preceding paper (Part1), we defined the average molecular weight, MSD, calculated by Svedverg's equation, and gave the relationship among MSD, Mw, and Mn. In order to confirm these theoretical relationships we carried out sedimentation, diffusion and light scattering measurements of polystyrene samples in butanone. Molecular weight distribution curves were obtained from sedimentation and diffusion measurements. The average molecular weights, MSD, Mw, and Mn, were calculated from the molecular weight distribution curves and their values were in good agreement with the observed values. The relationship, MSD=Mw-γ(Mw-Mn) is also established experimentally. The following relations were obtained between molecular weight and sedimentation and diffusion constants_??View full abstractDownload PDF (1324K) -
XII. The Permeability of Gases and Vapors through Cellulose Derivative FilmsYukio Ito1961 Volume 18 Issue 190 Pages 120-124
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe permeability coefficients (P) and the diffusion coefficients (D) of carbon dioxide, oxygen, nitrogen, helium and water vapor through cellulose derivative films were measured. The results are as follows:(1) P and D increase with the increase of acetyl contents in cellulose acetate, while the apparent activation energies for permeation (E) and diffusion (ED) decrease;(2) both P and D increase rapidly with the size of substitution radicals in cellulose derivatives just as in the case of polyvinylacetate derivatives;(3) when the logarithms of P and D are plotted against the reciprocal of the absolute temperature, the curves show inflection points at 43±2°C for ethylcellulose and at 45±2deg;C for butylcellulose.View full abstractDownload PDF (869K) -
XIII. The Permeation and Diffusion of HeliumYukio Ito1961 Volume 18 Issue 190 Pages 124-132
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSThe permeability coefficients (P) of Freon 12, carbondioxide, nitrogen, hydrogen and helium were measured for a wide variety of highpolymer films. The ratios of the permeability coefficients of Freon 12, CO2 and methane are kept nearly constant for several kinds of films, as have been seen in the case of N2, 02, and CO2. For CO2 and He, this is not the case. The diffusion coefficients of helium does not change so seriously with the various sorts of polymers as in the case of CO2. It is the molecular size of helium may be small enough to pass freely through the “holes” of the polymer film due to short-range motion of chain molecules such as the vibrational and/or rotational motions of side chains.View full abstractDownload PDF (1591K) -
Riichiro Chujo, Hatsuko Chujo1961 Volume 18 Issue 190 Pages 133-135
Published: February 25, 1961
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSIt has been shown in the previous paper that in the expansion formula of second virial coefficient for polydisperse polymer solutions the term of M1/2 is given by the sum of those of various kinds of averaged molecular weight. In the present paper we consider the influence of the breadth and/or the skewness of molecular weight distribution upon this term making use of two simple models. The results of the numerical calculations show that the influence of breadth is not so serious, while that of skewness is considerable. Especially, the system of low degree of polymerization is largely affected by the molecular weight distribution.View full abstractDownload PDF (348K)
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