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Predecessor
Volume 64, Issue 7
Displaying 1-19 of 19 articles from this issue
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[in Japanese]1991 Volume 64 Issue 7 Pages 399
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 400
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 401
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1991 Volume 64 Issue 7 Pages 402
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 403
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 404
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 405
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (108K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1991 Volume 64 Issue 7 Pages 406
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (169K) -
[in Japanese]1991 Volume 64 Issue 7 Pages 407
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 408
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 409
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 410-420
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 421-429
Published: 1991
Released on J-STAGE: July 09, 2007
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[in Japanese]1991 Volume 64 Issue 7 Pages 430-432
Published: 1991
Released on J-STAGE: July 09, 2007
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Kunio MORI, Kouji SAKAI, Yoshiyuki OHISHI, Kosaku TAMURA, Yoshiko SAIT ...1991 Volume 64 Issue 7 Pages 433-441
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSTo obtain NBR vulcanizates having antioxidant groups bounded in high concentration, new reactive antioxidants, 2, 4-bis (N-phenylphenylenediamino)-6-reactive groups-1, 3, 5-triazine were prepared and investigated on the amount of bounded antioxidants (DBA), monosulfide content for antioxidant pendants and crosslinks (MSP and MSC), the oxygen uptake behavior of NBR vulcanizates, and the mechanical properties after aging. The kinds of reactive groups in the reactive antioxidants and curing system have a great influence on DBA, MSP and MSC. Thiuram type accelerator gave high MSP and low DBA to NBR vulcanizates during vulcanization. High sulfur formation and thiazole type accelerators were effective in increasing DBA but ineffective for MSP and MSC. Reactive antioxidants with low number of sulfur chains in the reactive groups were very effective for increasing both DBA and MSP. The bounded antioxidants increased the starting period for the oxygen uptake of NBR vulcanizates with antioxidants concentration and the rate of oxygen uptake decreased. To expect high durability to NBR vulcanizates, it was important to provide high DBA as well as high MSP and MSC over 80%.View full abstractDownload PDF (836K) -
Akitaka SENUMA, Jun-ichi HAKOZAKI1991 Volume 64 Issue 7 Pages 442-446
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSEffects of the alkyl short chain branches and of the acetoxy branches on the crystallization of ethylene-vinyl acetate copolymer (EVA) were studied by the differential scanning calorimetric method.
The following equations were obtained for the reducing effect of the short chain branches on the crystallization of EVA,
χ=0.78exp(-0.24λ)
λ=λm+1.2λa
where χ is the crystallinity of EVA, λm and λa is the number of alkyl short chain branch and acetoxy short chain branch per 100 carbons, respectively.
Therefore it is concluded that the crystallinity of EVA exponentially decreases with the increase in the contents of short chain branches, and that the reducing effect of the acetoxy branch is 1.2 times larger than that of alkyl short chain branch on the crystallization of EVA.View full abstractDownload PDF (479K) -
Keiichi AKIMOTO, Shigemitsu OTOMO, Taizo SAKO, Yoshitomo YAMAMOTO1991 Volume 64 Issue 7 Pages 447-453
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSAntidegradants, such as IPPD, DPPD and DTBMP, in isoprene rubber vulcanizates were easily identified by simple procedure which rubber vulcanizate test pieces (5mm×5 mm×2mm) were put on silica-gel plate at room temperature for a day under 0.1kg/cm2 of weighting, followed by ordinary separation and detection procedure for TLC. In addition, it was suggested that this method was applicable to contact stain test for aromatic amine antidegradants.View full abstractDownload PDF (749K) -
Shujiro SHIGA, Kiyoshi IKEDA, Keitaro KOJIMA1991 Volume 64 Issue 7 Pages 454-458
Published: 1991
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSMorphological changes of carbon black agglomerates were observed for NR-, SBR-, and IIR-HAF-process oil compounds during the mixing in an internal mixer, using an optical microscope of a transmission method. For the convinience of observation, the recipe was designated as containing only a lesser amount of HAF, 10phr. Those observations were carried out over the minimum mixing times. The changes of the NR compounds are very similar to those of the EPR compounds shown in our previous articles. It suggests the onion peeling mechanism might control the dispersion stage of the NR mixing. Although some agglomerates indicate the existence of that mechanism, it was not evidenced whether or not the mechanism was dominant in the other rubber systems. The process oil influences little on the mechanism as understood by the investigation on the oilless systems of NR and EPR.View full abstractDownload PDF (997K) -
[in Japanese]1991 Volume 64 Issue 7 Pages 459-460
Published: 1991
Released on J-STAGE: July 09, 2007
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