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Volume 49, Issue 9
Displaying 1-6 of 6 articles from this issue
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Hiroshi UTSUGI, Hiroshi MIHIRA, Akemi AKOSHIMA1976 Volume 49 Issue 9 Pages 527-537
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe interfacial tensions between two kinds of immiscible organic liquids and also the immiscible organic liquid and water were investigated. The equations for free energy of their adhesion have been derived under the following assumptions : (i) the potential function would be separated into dispersion force, dipole-dipole interaction and polarization term (ii) the molecular distribution was homogeneous in both phases. The interfacial tension, γab thus obtained, was designated by the following equation, γab =γa+γb-2kab2ξab√γadγbd (I), where γa and γb were the surface tensions of liquids a and b, kab2=4dd/da (1+db/da) -2andξab=1+ (αaμb2+αbμa2) /Aab+2μa2μb2/3AabkT. Furthermore d is the equilibrium distance between the respective adjacent molecules and α, μ and A are the polarizability, dipole moment and attraction constant, respectively. This equation was considered to be the generalized expression to represent the several equations proposed before. The interfacial tension γab between the non-polar organic liquids and polar organic liquids or water was measured by the capillary method. The dispersion force component of surface tension of polar organic liquid, γd, was obtained from eq. (I) using many kinds of non-polar liquids as the reference. These showed a reasonable agreement with the ones by the contact angle method and showed much more reasonability because of the smaller standard deviations. The known dispersion force components of surface tension γbd and the interfacial tension γab for both polar liquids a and b were used to obtain γad from both eq. (I) and the equation, γab=γa+γb-2kab2√γadγba-2kab2√ (γa-γad) (γb-γbd) (II) which was perceived more reasonable than eq. (I).View full abstractDownload PDF (1680K) -
Visco-elastic Properties of Epoxy Resin Cured with DETATakaharu IZUMO1976 Volume 49 Issue 9 Pages 538-542
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSVisco-elastic properties of epoxy resin cured with non-stoichiometric amounts of diethylene triamine (DETA) were studied. The results were obtained as follows;
(1) In the vicinity of the crosslinked portion, the structure was different with the DETA concentration; (2) The region (I) where the DETA concentration was low showed high density as the consequence of the concentration to the crosslinked portion. The region (II) where the DETA concentration was high showed porous and rigid structure with the little influence of the concentration to the crosslinked portion. (3) As the results of calculation, the occupied volume (vo) showed increase and the free volume (vf) showed decrease in the region (I), which identically proved the assumption on the anomalous behavior in v-T curve described in the previous report.View full abstractDownload PDF (629K) -
Keio AOKI, Minoru SHIMADA1976 Volume 49 Issue 9 Pages 543-551
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe purpose of this study is to investigate the durability of protective coatings under flow codition of sea water. The equipments used in these experiments for about sixteen months are the one for testing flow of sea water, and laboratory apparatus of a rotating cylinder for testing flow of artificial sea water.
Results obtaind are as follows;
1) At the velocity of 6 m/sec. of the flow of sea water, the durability of protective coatings was not affected by flow conditions except the case many organisms adhered on the coats and the mixture of sand exist.
2) In the case of the protective coatings under the velocities of 4-6 m/sec. of flow condition, the appearance of coating was normal. And the organisms did not adhere on the coatings.
3) As for the effect of cathodic protection on the durability of protective coatings, the paint films were damaged in the case of over protection by high current of the impressed current system. However, in the case of the galvanic anode system with zinc, the paint films were not affected.
4) Anti-fouling paint of cuprous oxide in polyvinyl chloride system showed good result for organisms.
5) The hardness and the value of impedance of paint films were normal and were not affected by flow condition. However, the abrasion of the coated paint film was affected remarkably by the content of sand and the flow rate.View full abstractDownload PDF (1310K) -
Akira SHIBAMOTO, Akihiro MUNAKATA1976 Volume 49 Issue 9 Pages 552-558
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (933K) -
Takashi YOKOTA, Humiki TANIMOTO, Toshiei KOYANAGI1976 Volume 49 Issue 9 Pages 559-566
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
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Shoji YUASA, Kazuji MORITA, Akiko KANEKO1976 Volume 49 Issue 9 Pages 567-572
Published: September 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1221K)
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