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Volume 21 (1994)
- Issue 4 Pages 151-
- Issue 3 Pages 111-
- Issue 2 Pages 55-
- Issue 1 Pages 2-
Volume 21, Issue 2
Displaying 1-7 of 7 articles from this issue
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Nobuaki Okubo, Hirohisa Yoshida1994 Volume 21 Issue 2 Pages 55-60
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSMolecular motion of poly(propylene) (PP) composites with short glass fiber was analysed by dynamic viscoelastic measurement. The effect of glass fiber content on molecular motion of PP and the interaction between PP and glass fiber were discussed. Two types of 2wt% ethylene block-copolymerized PP, maleic anhydride treated PP and non-treated PP, were used as matrix resin. The maleic anhydride treated PP showed reinforced effect on mechanical properties remarkably. Four tan δ peaks, α'-, α-, β- and γ-relaxations from high temperature side were observed for PP and PP composites in the temperature range from -70°C to 170°C at 1Hz. α'-, β-, and γ-relaxations were assigned to melting, glass transition of PP and main chain motion of ethylen-propylene unit, respectively, in relation to transition temperature and activation energy. α-relaxation of PP was caused by relaxation in crystal, however, α-relaxation of glass fiber reinforced PP contained α1-relaxation which was observed independently at 0.02Hz. α1-relaxation was caused by molecular motion of amorphous region surrounding glass fibers in relation to frequency dependency of tan δ peak temperature and activation energy.View full abstractDownload PDF (1309K) -
Mesurement by AC Calorimetry for Heptacosane (n-C27H56)Yasuo Saruyama, Kanichiro Takamizawa, Yoshiko Urabe1994 Volume 21 Issue 2 Pages 61-67
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSTemperature dependence and time dependences of the heat capacity of n-paraffin crystal (C27H56) in the rotator phase were studied by AC calorimetry. High purity material (99.9%) was used as the sample to avoid the large impurity effects to the phase transition behavior. Measurement during temperature scanning at 0.5K/min showed existence of motion in the rotator phase with the relaxation time about 0.3sec. Time dependence of the heat capacity at constant temperature in the rotator phase showed that the heat capacity changed with time very slowly. After the relaxation for twelve hous in the ratotar phase the sample was cooled down to the low temperature phase then heated up to the liquid phase. Temperature dependence of the heat capacity on the cooling and the heating processes showed that the relaxed state reached at temperatures higher than 329.9K was distinct from that reached at temperatures lower than 329.5K. It was found that there were two stable phases in the temperature region of the rotator phase. A model to explain the experimental results was proposed.View full abstractDownload PDF (941K) -
Masahide Wakakura, Homare Sinohara, Takeo Kanai1994 Volume 21 Issue 2 Pages 68-75
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSFires and explosions at chemical plants were often caused by the thermal runaway reaction that occurred by loss of process control.
To avoid such incidents, we discussed how to establish thge chemical reaction hazards test using some apparatus for thermal measurement of energid or unstable materials, such as hydrogen peroxide (H2O2) and chemical reactions.
In this paper we studied the hazard evaluation of the amidation reaction process of 5-amino-1, 2, 4-thiadiazole-3-il-2-methoxy-iminoacetonitrilc intermadiate.
As the process contain H2O2 decomposition characteristics of H2O2 mixtures were measured using pressure DSC.
Subsequently to determine safe operating conditions and the design of safety features of this process, further thermal measurement was done using reaction calorimeter (RC1).
And, following conclusions were given.
(1) It was provided that pressure DSC is effective for the hazard evaluation of volatile and unstable substances.
(2) Cyclic nitrile compounds such as M-14 sometimes occur rapid heat generation, and if the operation of the process is carried out under inadequate conditions, thermal runaway reaction may be induced.
(3) Using RC1, safety and optimum condition of the actual process of the amidation reaction for the scale-up was decided.View full abstractDownload PDF (944K) -
Kenji Ebara, Toshimasa Hashimoto1994 Volume 21 Issue 2 Pages 76-80
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSRecently, the computer aided engineering (CAE) technology has been developed in the field of polymer processing and plastic molding. In this stage, the thermal properties, such as thermal diffusivity and specific heat, has become more significant. To attain this purpose, the data base will be required more exactly and speedy. The more precise data of thermal properties, which are systematically arranged, lead to the second stage development of CAE technology.View full abstractDownload PDF (768K) -
Iwao Katayama, Takamichi Iida1994 Volume 21 Issue 2 Pages 81-91
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSAiming at the data base on the thermodynamic properties of binary alloys and compounds containing rare-earth elements at high temperatures, published papers and review papers were picked up from Metals Abstracts or Chemical Abstracts from 1974 to 1993 and shown in a table. Thermodynamic values of the binary rare-eath compounds were gathered in our technical report (Met. Review of MMIJ 9 (1), 51 (1992)).View full abstractDownload PDF (1316K) -
Thermal Behavior of Chlorophyll-aMariko Ishiwatari1994 Volume 21 Issue 2 Pages 92-95
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (537K) -
Hiroshi Shimizu1994 Volume 21 Issue 2 Pages 96-98
Published: April 25, 1994
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (485K)
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