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Volume 51, Issue 5
Displaying 1-5 of 5 articles from this issue
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Polymerization of Phenyl Glycidyl Ether by Tertiary AlkylaminesKathuyoshi SAITO, Takashi KAMON, Yasuhiko MIWA, Kensaku SAEKI1978 Volume 51 Issue 5 Pages 271-278
Published: May 20, 1978
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSIn order to elucidate the reaction of epoxy resin with aliphatic tertiary alkylamines,the bulk polymerization of phenyl glycidyl ether,a model compound of epoxy resin,by the aliphatic tertiary alkylamines was investigated kinetically in the absence of solvent at the temperature range of 40-120°C as the autocatalyzed reaction.
The rate constants of these reaction were as in the following order N,N-dimethylalkylamine>N,N-dimethylcyclohexylamine>N,N-dimethylbenzylamine>N,N-diethylalkylamine>N,N-dipropylalkylamine.
On the N, N-dimethylalkylamine systems,the rate constants were a little affected on the value of pKa for the amines.
The activation energies of these reactions were found 13.5-14.5 Kcal/mol for the N,N-dimethyl-alkylamines, 12.11 Kcal/mol for the N, N-dimethylcyclohexylamine,11.78 Kcal/mol for the N,N-dimethylbenzylamine and 3-9 Kcal/mol for the N,N-diethylalkylamines, respectively.
N, N-diethylbenzylamine and N,N-dipropylbutylamine did not react with phenyl glycidyl ether in these experimental conditions.
From these results, it is concluded that the effect of steric hindrance of aliphatic tertiary alkylamines on the bulk polymerization might be large.View full abstractDownload PDF (890K) -
Fumiyoshi ISHII, Hitoshi TAKEBAYASHI, Yasuo UMEZAWA, Masumi KOISHI1978 Volume 51 Issue 5 Pages 279-288
Published: May 20, 1978
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSStainless steel modified-kaolin was prepared by centrifugal rotating type ball mill in wet grinding process. The preparin conditions were varied for both alumina ball numbers and amounts of kaolin. Changes of surface properties of modified-kaolin powders were examined for sedimentation volume, specific gravity, electron microscopy, and X-ray analysis.
From the above observations, the following results were obtained : (1) Increase of stainless steel powder contents gave better results in grinding condition of lower ball number or lower amount of kaolin. These powders showed a metallic surface effect. (2) At the sedimentation volume measurement in water, ethyl alcohol, ethyl alcohol aqueous solution, and Tween type surfactant aqueous solution, regardless the preparing conditions, these modified powders well-dispersed in a medium flocculate gradually each other, then, they form the network structure. Second, these aggregates slowly sediment, and in that process the disperse medium clearly excludes upwards. Therefore, sedimenting surface of modified powders was observed in this experiment. (3) Specific gravities of modified powders showed much larger values with high contents of stainless steel powder.View full abstractDownload PDF (2178K) -
Taiithi TSURITANI1978 Volume 51 Issue 5 Pages 289-301
Published: May 20, 1978
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2026K) -
Motoya IWAKO, Akira HAYASHI1978 Volume 51 Issue 5 Pages 302-308
Published: May 20, 1978
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1197K) -
Taiichi TSURITANI1978 Volume 51 Issue 5 Pages 309-331
Published: May 20, 1978
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (3031K)
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