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Volume 63, Issue 5
Displaying 1-9 of 9 articles from this issue
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1990 Volume 63 Issue 5 Pages 243-249
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese]1990 Volume 63 Issue 5 Pages 250-253
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese]1990 Volume 63 Issue 5 Pages 254-260
Published: 1990
Released on J-STAGE: July 09, 2007
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K. MUNIANDY1990 Volume 63 Issue 5 Pages 261-267
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSNatural rubber has been used in engineering applications for over a century. More recently, this elastomer is finding increasing use in very demanding and sophisticated areas, for example, in off-shore oil installations and in seismic bearings for the protection of buildings from earthquakes. It is the unique combination of properties of natural rubber which lead to its choice in these aplications. This paper discusses some of these properties that make natural rubber a desirable material for engineering products.View full abstractDownload PDF (783K) -
Norio TSUBOKAWA, Kazuhito YANADORI, Yasuo SONE1990 Volume 63 Issue 5 Pages 268-274
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe introduction of imidazoline groups onto the surface of furnace black or acetylene black by the rection of 2, 2′-azobis [2-(2-imidazoline-2-yl) propane] (AIP) with these carbon blacks was investigated. When carbon black was treated with AIP in benzene, 2-(2-imidazoline -2-yl) propane radicals formed by the decomposition of AIP are found to be trapped on these surfaces. The amount of imidazoline groups introduced onto furnace black, Philblack O, and acetylene black, Denkablack, was determined to be 0.28mmol/g and 0.09mmol/g, respectively. Then the reaction of carbon black having imidazoline groups with chlorosulfonated polyethylene (CSM) was carried out in toluene at 30-80°C. It was found that imidazoline groups introducced onto carbon black readily react with chlorosulfonyl groups of CSM and CSM is grafted onto cabon black surface with sulfonamide bond: the percentage of grafting of CSM onto Philblack O and Denkablack reached to 36.2% and 13.2%, respectively. No gelation of CSM by imidazoline groups introduced onto carbon black was observed. The percentage of grafting of CSM onto carbon black was scarcely affected by molecular weight of CSM, but the number of polymer chain grafted onto the surface decreased with increasing molecular weight of CSM. Furthermore, the effect of temperature on the grafting was discussed.View full abstractDownload PDF (706K) -
Mutsuhisa FURUKAWA, Kenji SUSUKIDA, Tetsuo YOKOYAMA1990 Volume 63 Issue 5 Pages 275-283
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSCarbon-polyurethane composites were prepared from polyetherurethane (PPG-, PEG-TDI-BD, -TMP) and electrical conductive fillers. The fillers used were artificial graphite, carbon blacks (Ketjen EC, BP-2000, and Denka Black), carbon fiber, CuCl2-graphite intercalation compound (GIC), and nickel powder. Mechanical properties, Tg, and thermal stability of these composites were studied. The GIC which is unstable in air was stabilized in the polyurethane matrix. However, the electrical conductivity of the GIC-PU composite was improved only slightly as compared with that of graphite-PU. Carbon fiber showed reinforcement effect in mechanical properties and thermal stability for the PU composites. Carbon fiber-PU composites seem to be usable as shielding materials of electromagnetic interference. The conductivity of carbon black (5, 10wt%)-PU showed 106-102Ω•cm. The electrical conductivity of the carbon black-PU was improved considerably by introducing lithium ion. The volume resistivity of the carbon black-PU composites containing propylene carbonate did not change with temerature between -100 and 100°C.View full abstractDownload PDF (1029K) -
Tomohiro KURAMOCHI, Ichiro ENOMOTO, Takehiko KIKUCHI, Yoshio SHIMIZU, ...1990 Volume 63 Issue 5 Pages 284-290
Published: 1990
Released on J-STAGE: July 09, 2007
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1990 Volume 63 Issue 5 Pages 291-300
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese]1990 Volume 63 Issue 5 Pages 301-302
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (208K)
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