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Volume 53, Issue 12
Displaying 1-5 of 5 articles from this issue
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Effect of Glass Substrate Surface State and Additives on the Adhesive ForceGO KAWAMURA, Teruo TSUNODA1980 Volume 53 Issue 12 Pages 691-696
Published: December 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe adhesive force of phosphor powder layers applied to glass substrate has been examined by centrifugal method. The substrate surface cleanliness and roughness have shown little effect on the adhesive force. However, the adhesive force decreases significantly when the glass substrate has been coated with SnO2 which is used for rapid start fluorescent lamps to give a surface electric conductivity.
The major finding of this report is that the adhesive force on both substrates is strengthened by the addition of fine phosphor or calcium pyrophosphate powder, alkoxides of boron, tin, aluminum or titanium, or silicone oil. Especially, the addition of silicone oil has shown another feature of slight increase in fluorescence intensity.View full abstractDownload PDF (761K) -
Seiichi KONDO, Hirofumi FUJIWARA, Eiichi AMANO1980 Volume 53 Issue 12 Pages 697-703
Published: December 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe volumetric method is widely used to measure the gas adsorption isotherms which have the most basic importance for characterizing porous and nonporous colloid materials. However, this method contains a surprisingly large number of sources of experimental errors in contrast to its theoretical and technical simplicity.
Seventeen sources of errors are pointed out arising from the vacuum line, the vacuum techniques, the method of pressure measurement, the estimation of dead volumes, the pretreatment and the preparation of the samples to be measured. Among them, the sources of errors relating to the sample seem. to have the greatest contribution to the total error, since colloid materials are generally very sensitive to the physical, chemical and mechanical treatment such as preheating, weighing and evacuation.
A sample cell for gas adsorption is newly developed in this laboratory, which enables the precise measurement of the dead volumes and of the sample weight without exposing to air, and a very easy evacuation in the vacuum system before gas adsorption.
The reliability of the absolute values of the amount of gas adsorbed measured under these precautions is not always high, because almost no standard scales for these physical quantities are available. In this study, a search for reference materials are carried out as follows. Microporous silica gels of granular type were sufficiently purified, grinded and sieved in the range from 32 to 42 JIS mesh, mixed well using a special type mixer to attain a good homogenuity by the courtesy of Mr. Kozo Yamamoto and Mr. Kazunori Nobuhara of Fuji-Davison Co., Ltd. These were distributed to 14 laboratories in order to compare the values measured in each laboratory. The adsorption isotherms obtained and the BET surface areas, C values and the pore volumes computed from these data differ from each other much more largely than those which would be expected from the sample heterogenuity. This shows the strong necessity to set several materials as references, in order to improve the reliability of these values and the measuring techniques.View full abstractDownload PDF (1063K) -
Takashi HANDA, Naobumi EBIHARA, Shinetsu FUJIEDA, [in Japanese], Masum ...1980 Volume 53 Issue 12 Pages 704-721
Published: December 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDepartment of Chemistry, Science University of Tokyo;Development and Research Center, Toshiba Electric Co., Ltd.;Faculty of Pharmaceutical Sciences, Science University of Tokyo Blending and kneading processes of the flame retardant additives have distinct effects on the mechanical properties of the flame retarding polypropylene.
An estimation was made of the dispersibility of additives, Sb2O3 and dichlorane, after preparing the sample sheets, by using the fluorescent X-ray and X-ray microanalyzer techniques.
It was found that the mechanical properties, such as bending strength, impact strength, and tensile strength, were governed by the dispersibility of dichlorane in the presence of Sb2O3 into powder or pellet type polypropylene during the blending and kneading processes. Each strength value increased with the increase of dispersibility (in other words, degree of dispersion) of dichlorane.
A technique to produce superior flame retarding polypropylene, even by using pellet as raw materials was also established.View full abstractDownload PDF (1702K) -
Takeo IMAI1980 Volume 53 Issue 12 Pages 713-723
Published: December 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2010K) -
Masaru MATSUOKA1980 Volume 53 Issue 12 Pages 724-739
Published: December 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2082K)
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