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Predecessor
Volume 58, Issue 3
Displaying 1-6 of 6 articles from this issue
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Hideaki IMANISHI, Tomohiro YAMAGUCHI, Norio FUKUDA2001 Volume 58 Issue 3 Pages 99-104
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe impact resistant property of poly (vinyl chloride) (PVC) could be improved by the addition of finely powdered calcium carbonate (CC), and the factors such as kind of stabilizer, molecular weight of PVC, amount of plasticizer, blending temparature, and bending process by a heat twin roller were investigated for the improvement. The impact resistant property of PVC was improved by use of fatty acid salts as stabilizer. The higher the molecular weight of PVC was and the larger the mixed amount of plasticizer to PVC was, the more excellent the impact resistant property was. Blending temparature and blending process by a heat twin roller were also significant factors for the improvement. In particular, pre-blending process at low tempatatures showed remarkable effects. The observations by SEM revealed that the sufficient dispersion of powdery CC, whose particle size was from 0.01 to 0.3μm, in the PVC matrix led to the remarkable improvement of the impact resistant property.View full abstractDownload PDF (3310K) -
Takashi NAKAMURA, Akihiko KOBAYASHI, Ryuzo MIKAMI2001 Volume 58 Issue 3 Pages 105-110
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSNovel silicone ionomers were synthesized and their particles were dispersed in a silicone oil. The dispersions were evaluated as ER (electrorheological) fluid. (1) Novel silicone ionomers, alkali metal salts of carboxylic acid modified silicone and those of sulfonic acid modified silicone, were developed and particles of these ionomers were made. ER fluids were prepared by dispersing these ionomer particles in a silicone oil. (2) ER fluids made of the carboxylic acid salts type showed high yield stresses over 2 kPa. The yield stresses were the highest at around 100°C. Leak currents increased as the yield stress increased. The properties and the stability at high temperatures were not good. (3) ER fluids made of the sulfonic acid salts type showed low yield stresses, but showed an excellent flat dependency of leak current on temperature. These fluids also showed an excellent stability at high temperatures. The yield stress of these fluids increased as the temperature increased.View full abstractDownload PDF (1151K) -
Takashi NAKAMURA, Katsutoshi MINE2001 Volume 58 Issue 3 Pages 111-116
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSDynamic viscoelastic behaviors of hydrogen silsesquioxane (HSQ) resin in the temperature range of 200 to 400°C were investigated in either nitrogen or air, focusing on G′ and G″ values. HSQ resin was melted and then cured with heat. As the curing proceeded, G′ increased as the temperature increased, while G″ was lost at certain temperatures, i. e. HSQ is believed to be cured into a completely elastic material. Oxygen takes a role to promote the speed of curing and to increase the final modulus of the cured resin without changing the pattern of curing behaviors, compared to the curing in nitrogen. Effects of temperature/atmosphere on melting behavior and effects of preheating before cure in nitrogen were also investigated. The obtained data suggest a possibility to improve the planarizing/curing processes and film properties of HSQ resin that is practically available for semiconductor applications.View full abstractDownload PDF (1156K) -
Mitsuhiro FUKUDA, Hiroaki KIKUCHI2001 Volume 58 Issue 3 Pages 117-122
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSFree-energy related properties of methane, ethane, propane, and butane dissolved into cis-1, 4-polyisoprene were calculated using the thermodynamic integration (TI) method. Solubility coefficient was larger in the order: butane>propane>ethane>methane both at 100°C and at 0°C. With the decrease in the temperature, the solubility coefficients increased for the four kinds of gas molecules. These results were in good correspondence with the experimental ones, and the absolute values were also satisfactory. The advantages of the evaluation of the solubility using TI method were discussed in light of practical uses.View full abstractDownload PDF (1339K) -
Toshio OGAWA, Hideki JINNAI, Satoshi OSAWA2001 Volume 58 Issue 3 Pages 123-129
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSMany traditional wares prepared with Urushi are exhibited in museums under sunlight or the light of a fluorescent lamp. The color of these wares changes gradually with time. Therefore, the best way to prevent the change of external appearance is to store the wares in a dark place. However, this is not realistic in the museums or in practical use of the wares. In this study, bromination of oriental lacquer film was tried to improve the light stability of such film. As the result, light stability of the oriental lacquer film was considerably improved in the appearance evaluations, such as gloss and color difference, even if ultraviolet rays were used to irradiate it. The bromination for 10-20 minutes was best. Additionally, the surface oxygen content of the film increased with exposure time for ultraviolet rays, regardless of degree of bromination.View full abstractDownload PDF (3745K) -
Takashi IDE, Kenji UEDA, Hiroshi TSUBAKIHARA2001 Volume 58 Issue 3 Pages 130-133
Published: March 25, 2001
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe structural changes of the“emeraldine base” form of polyaniline (EB) treated thermally in air and in vacuum have been studied by UV-V and IR spectroscopies. From the behavior of the results, we can divide the temperature range into two regions: up to about 210°C and higher than that. In vacuum, the structures of EB remain the same with increasing temperatures up to 210°C. In higher temperature treatment, a decrease in quinoid resulting from imine-imine crosslinking has been observed. Even at a lower temperature up to 210°C, however, the thermal treatment in air induces structural changes of EB by addition of oxygen, such as the formation of 1, 2, 4-substitution and the decrease in hydrogen of amine. The both of these oxidizing and crosslinking reactions should be accelerated at the elevated ternperature higher than 210°C.View full abstractDownload PDF (947K)
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