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Volume 40, Issue 4
Displaying 1-4 of 4 articles from this issue
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Kyoichi SHIBAYAMA, Eiki JIDAI1967 Volume 40 Issue 4 Pages 149-154
Published: April 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe mechanical properties of the polymer films which were obtained from blend emulsions of the glassy and rubbery polymers have been studied. The copolymer of acrylonitrile, styrene and glycidylmethacrylate was used as the glassy polymer, and that of ethylacrylate and glycidylmethacrylate as the rubbery polymer. The specimens used were the films obtained by electrodeposition from mixed emulsions of the glassy and rubbery polymers in various ratios. A straight copolymer of acrylonitrile, styrene, ethylacrylate and glycidylmethacrylate, and a two-step copolymer which was obtained by copolymerization of acrylonitrile, styrene and glycidylmethacrylate in the emulsion of ethylacrylate-glycidylme-thacrylate copolymer were also studied.
The straight copolymer was found to show a single absorption peak at 80°C, while the blended polymers and the two-step polymer showed two absorption peaks at 20°C and 140°C. The heights of these two absorption peaks were dependent on the ratio of the rubbery polymer to the glassy one, and the steepness of the peak was affected by the process with which the film was prepared and also by the method of emulsion preparation.
It is concluded that a heterogeneous system is formed from the blend emulsions and the emulsions of the two-step copolymer. An attempt is made to analyze the results in terms of a simple mechanical model in which the existence of boundary layers between the phases of component polymers are taken into consideration. It appears that the boundary layers formed in the course of sintering of emulsion particles plays an important role in determining the mechanical properties of the films.View full abstractDownload PDF (692K) -
Tomomi WATANABE, Takashi SENZAKI, Yuichi YOSHIDA1967 Volume 40 Issue 4 Pages 155-162
Published: April 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe correlation between the factors which affect the formation of iron phosphate film and its anticorrosiveness has been investigated.
The weight of the film which was 0.2-0.7g/m2 was determined mainly by the pH of the bath solution and the length of treatment. The analysis of the iron phosphate films showed that 70% of the film weight was due to FePO4. The clear interrelation of the anticorrosiveness to the film weight which exists in the case of zinc phosphate film was not found here since the absolute amount of the film was too small. The anticorrosiveness of the bare iron phosphate film and that when a paint was applied on the film were not linearly related. A low pH value increased the anticorrosiveness of the former case, while a high pH value increased that of the latter case. The anticorrosiveness of both cases was greatly increased by the chromic-acidulated rinsing treatment of the iron phosphate film.
It is concluded that although it is possible to control the weight of iron phosphate film by the treating conditions, a proper formulation of the bath solution and the cromic-acidulated rinsing treatment are indispensable to a good anticorrosivenss. The best pH value should be determined after the most proper formulation is chosen.View full abstractDownload PDF (872K) -
Manabu KIYONO1967 Volume 40 Issue 4 Pages 163-166
Published: April 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (717K) -
Keizô ÔTA1967 Volume 40 Issue 4 Pages 167-178
Published: April 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1843K)
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