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Volume 68, Issue 12
Displaying 1-6 of 6 articles from this issue
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Hiroshi OYABU, Mikio TERADA, Yu ASO, Yoshiaki ODA1995 Volume 68 Issue 12 Pages 729-734
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSFour types of modified starch were selleceted as the third component for the emulsification of laccase and urushiol analogue in the development of an enzyme-reaction-type paint as a model of urushi.
Laccase produced from a cultured medium of Pycnoporus Coccineus and synthesized 4 - {9' (Z), 12' (Z) -octadecadienyl} catechol were emulsified with the modified starch, and the obtained emulsions were dried at 20°C and 80% RH for 24h. We measured the drying time, dynamic viscoelasticity, gloss, and transmittance color of these films.
Main results were as follows : (1) The emulsification by these modified starches was adequate ; (2) Phosphate and carbamoyl radicals of modified starch influenced the initial hardening, and the drying time was shorted with increasing these radicals ; (3) These films showed ideal dynamic viscoelasticity like a ordinary urushi films and had higher gloss and more yellowish color than that.
From the results presented above, we were able to develop an enzyme-reaction-type paint without natural urushi.View full abstractDownload PDF (708K) -
Hideki KOBAYASHI1995 Volume 68 Issue 12 Pages 735-740
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESS3, 3, 4, 4, 5, 5, 6, 6, 6 -Nonafluorohexyltrimethoxysilane (FTAS) and the corresponding fluorosilicone resin (FSOR) exhibiting low surface tension were used as surface modification additives for resins. Two kinds of resins, acrylic resin (PAR) and methylsilicone resin (PSO), were investigated. The solutions were spin-coated on glass slides. Contact angle of the resin surfaces was measured with water and methylene iodide as the test liquids. Solid surface tension (σ2) was obtained by using Owens-Wendt approach. With only a few percent addition of FSOR, σ2 of both the resins considerably decreased from 42 to 24mN/m for the PAR system and from 27 to 15 mN/m for the PSO system. On the other hand, the effect of the addition of FTAS on σ2 was little observed.View full abstractDownload PDF (602K) -
Takao HAMATSU, Kazuhiro HUKUDOME, Jun-ichi HIROSE, Minako ITO1995 Volume 68 Issue 12 Pages 741-751
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSA novel cellulose derivative, cellulose nitrate carboxymethyl ether (CNC) is a polyelectrolyte with certain amount of carboxymethyl ether groups and nitrate ester groups. CNC was found to have not only excellent solubility in mixtures of water and a small amount organic solvents but also excellent compatibility with several water-soluble resins. CNC, which possesses hydrophilic carboxymethyl ether and hydrophobic nitrate ester, behaved as a polymeric surfactant with an excellent pigment dispersibility. The modulus of CNC backbone was as high as that of original cellulose at a wide range of temperature. Also its glass transition temperature was high, resulting in an excellent drying and heat-blocking resistance.View full abstractDownload PDF (1039K) -
Naoko YAMAZAKI, MINGXIA XU, Wakako KUNISHIMA, Keiko JONOSONO, Satoko N ...1995 Volume 68 Issue 12 Pages 752-757
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSTiO2 hydrate coating on mica in an aqueous solution of TiOSO4 by a homogeneous precipitation using urea was studied with emphasis on coating conditions for a uniform coating. For the uniform coating of TiO2 film on mica surface, it was found that the deposition of a large number of TiO2 particles on the surface at the initial stage and subsequent slow growth of them were necessary. A uniform dense film was formed under the coating conditions as follows : [(NH2) 2CO], 0.1mol·dm-3 ; [H2SO4], 0.29mol · dm-3 ; [TiOSO4], 0.01mo1 · dm-3 ; and twostep depositions for 60 min at 80°C and 30 min at 70°C. The morphology of TiO2 film formed on mica was little affected by firing at 800°C. When TiO2 particles were formed in the solution phase, they tented to adhere to mica, which made the surface ununiform.View full abstractDownload PDF (1287K) -
Isao SEKINE, Masahiro KATO, Makoto YUASA1995 Volume 68 Issue 12 Pages 758-762
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe corrosion resistance of mild steels coated with double-electropolymerized films based on 2 -vinylpyridine and acrolein was investigated in aqueous solutions at various pH.
The corrosion resistance of the double-polymerized film system was superior to that of the single-polymerized one. The demerit on corrosion resistance of steel coated with polymerized film could be improved by double-electropolymerization.View full abstractDownload PDF (572K) -
Miki NIWA1995 Volume 68 Issue 12 Pages 763-770
Published: December 20, 1995
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1037K)
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