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Volume 81, Issue 6
Displaying 1-5 of 5 articles from this issue
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Takatoshi NAKATANI, Yoshinori TOMINAGA, Kyoko HIRAOKA2008 Volume 81 Issue 6 Pages 197-203
Published: June 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSThermosetting ionic polyurethane elastomers (IPUEs) containing sodium sulfonate groups and low molecular weight organic dyes such as 6-aryl-2H-pyrone derivatives (Py series) were prepared and their photoluminescent (PL) properties, ionic conductivities and Tg were investigated. PL properties of dyes in the IPUEs were found to be similar to those in dichloromethane, and some Py dyes showing stronger emission in the IPUEs commonly had N, N-dimethylamino groups at the 4-position of the aryl rings. For the IPUEs, variance of the ionic group contents did not affect PL properties, but effects of the dye contents on Tg, conductivities and aging behaviors of PL properties were different depending on the dyes used. Since no aging were observed for the dyes in the solid state, the aging of the IPUEs was considered to be due to photodegradation of the IPUE matrices. The aging rates of the IPUEs containing a Py dye showing stronger emission were higher than those of others. In addition, Tg elevation and the decrease of conductivity was observed by increase of the Py dye content. These results suggested that the Py dye might have considerably strong interaction with the IPUE matrix.View full abstractDownload PDF (3612K) -
Tomoko WATANABE, Yoshito OHTAKE, Hitoshi ASABE, Fumio KOYAMA, Nobunao ...2008 Volume 81 Issue 6 Pages 204-210
Published: June 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSBiodegradation of low density polyethylene (LDPE) containing biodegradation-inducing agents was carried out in soil for 13 years. When LDPE containing biodegradation-inducing agents composed of starch, vegetable oil, calcium oxide, metal compounds, and oxidized wax were buried in soil for 13 years, biodegradation proceeded to some extent. The progress of degradation was monitored by the remaining weight, SEM, GPC and FT-IR measurement of the specimen. Differed from the ordinary oxidative degradation, formation of carbon-carbon double bond and hydroxy group together with carbonyl function was confirmed in the sample used in this study. Though the rate of biodegradation was still slow, the significant acceleration was observed by using the biodegradation-inducing agents compared with that of LDPE alone.View full abstractDownload PDF (12826K) -
Intrinsic Viscosity in the SEC-ViscometryEiichi TAKATORI, Takatoshi SHIMURA2008 Volume 81 Issue 6 Pages 211-217
Published: June 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSMany workers proposed an equation for a single point determination of intrinsic viscosity [η]. In these methods Solomon-Cuita's and Solomon Gotesman's equations were suitable with concentration of polymer c up to specific viscosity ηSp<0.6, and Fikentscher's with concentration c nearly equal to ηSp=1.5. In SEC-Viscometry, ηSp/c was equal to Solomon-Cuita's and Solomon Gotesman's. Significant data were ηSp and c.View full abstractDownload PDF (4264K) -
Takashi INOUE2008 Volume 81 Issue 6 Pages 218-222
Published: June 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSRubber technology has a long history. There still remain many unsolved subjects, being technologically familiar but scientifically unclear. By going back to such subjects and thinking deeply, one could put forth various new perspectives. The examples are shown for the polymer/polymer mixing, the processability and rubber elasticity of thermoplastic vulcanizate, the resin curing, and the cure heterogeneity.View full abstractDownload PDF (11191K) -
[in Japanese]2008 Volume 81 Issue 6 Pages 223-230
Published: June 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (15598K)
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