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Predecessor
Volume 74, Issue 7
Displaying 1-13 of 13 articles from this issue
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[in Japanese]2001 Volume 74 Issue 7 Pages 257
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (215K) -
[in Japanese]2001 Volume 74 Issue 7 Pages 258
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (205K) -
[in Japanese]2001 Volume 74 Issue 7 Pages 259
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (232K) -
[in Japanese]2001 Volume 74 Issue 7 Pages 260
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (160K) -
[in Japanese], [in Japanese], [in Japanese]2001 Volume 74 Issue 7 Pages 261
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (229K) -
[in Japanese], [in Japanese], [in Japanese]2001 Volume 74 Issue 7 Pages 262
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (220K) -
[in Japanese]2001 Volume 74 Issue 7 Pages 263
Published: 2001
Released on J-STAGE: May 28, 2007
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[in Japanese]2001 Volume 74 Issue 7 Pages 264-269
Published: 2001
Released on J-STAGE: May 28, 2007
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[in Japanese]2001 Volume 74 Issue 7 Pages 270-274
Published: 2001
Released on J-STAGE: May 28, 2007
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[in Japanese]2001 Volume 74 Issue 7 Pages 275-276
Published: 2001
Released on J-STAGE: May 28, 2007
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Hitoshi IWABUKI, Toru NOGUCHI2001 Volume 74 Issue 7 Pages 277-282
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSThe molecular mobility of vulcanized chloroprene rubber (CR) was examined by 1H pulsed NMR. The spin-spin relaxation time (T2) of 1H showed that the vulcanized CR consisted of three components of rubber molecules. The component with the longest T2 (M3 component) appeared at above 90°C, and its molecular mobility was similar to that of liquid. The M3 component was thought to be composed of branch structures such as dangling chains and endchains. For the CR filled with ultrafine gold particles, the temperature at which the M3 component appeared became higher with the increase of gold content. The molecular mobility of the branch structures was reduced by the interaction between the surface of the gold particles and the end groups of rubber molecules such as the metal-sulfur bond. The gold particles did not change the stress-strain and the viscoelastic behaviors of CR, but improved its fatigue property at higher temperature.View full abstractDownload PDF (969K) -
Tadaoki OKUMOTO, Takao YAMADA, Shin TSUGE, Hajime OHTANI2001 Volume 74 Issue 7 Pages 283-288
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSSulfur-bridge structures in vulcanizates of EPDM rubber cured with sulfur tagged accelerators as 2-mercaptoben-zotiazole (MBT), tetramethylthiuram-monosulfide (TMTM) and tetramethylthiuram-disulfide (TMTD) were studied by pyrolysis gas chromatography (Py-GC) with a sulfur selective flame photometric detector(FPD). Two kinds of sulfur containing products such as C7H6S(I)(II) were typically observed on the pyrolysis gas chromatogram(pyrogtoram). These products might be assigned for 2, 4-cyclopenta[2, 3-b]thiophene and 2, 5-cyclopenta[2, 3-b]thiophene and supposed to be formed from sulfur bridges to ethylidene-norbornene residues in the polymer chain through cyclization. The vulcanization process for EPDM rubbers was discussed on the basis of relationships between the relative yield of C7H6S(I) (II) and curing times. The chemical mechanisms of formation of sulfur-bridges were also discussed on the basis of the observed pyrograms at the beginning of curing times.View full abstractDownload PDF (781K) -
Direct Adhesion between Polymer Plated Metals and Acrylic Rubber during VulcanizationPeng GONG, Kunio MORI, Hidetoshi HIRAHARA, Yoshiyuki OISHI2001 Volume 74 Issue 7 Pages 289-295
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSA novel technique for the direct adhesion between acrylic rubber (ACM) and metals, such as iron, nickel and stainless steel SUS 304 during vulcanization was developed. The metals are first plated with thin polymer films through the electrochemical polymerization of 6-diallylamino-1, 3, 5-triazine-2, 4-dithiol monosodium (DAN), and then adhered directly to acrylic rubber during vulcanization. The modification of metal surface has been also called polymer plating compared with the traditional metal electroplating. The thickness of the polymer film has a significant effect on the peel strength of the adherend of polymer plated metal to ACM. The peel strength of the adherend increases rapidly with the film thickness within about 25nm, and beyond the thickness, maintains enough peel strength showing the rubber cohesive failure with 100% rubber coverage. The peel strength of the adherends decreases with the increase of the amounts of the curing agents but shows rubber cohesive failure in the normal compounding amounts. The curing temperature and time of the rubber have only a little effect on the peel strength of the adherend. The adherend has excellent heat aging resistance and oil resistance.View full abstractDownload PDF (1457K)
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