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Predecessor
Volume 63, Issue 1
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1990 Volume 63 Issue 1 Pages 1
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese]1990 Volume 63 Issue 1 Pages 2
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese]1990 Volume 63 Issue 1 Pages 3-9
Published: 1990
Released on J-STAGE: July 09, 2007
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[in Japanese]1990 Volume 63 Issue 1 Pages 10-17
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (620K) -
[in Japanese]1990 Volume 63 Issue 1 Pages 18-28
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (1267K) -
[in Japanese]1990 Volume 63 Issue 1 Pages 29-39
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (941K) -
[in Japanese], [in Japanese], [in Japanese]1990 Volume 63 Issue 1 Pages 40-42
Published: 1990
Released on J-STAGE: July 09, 2007
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Kunihiko FUJIMOTO, Shigenori HAMANO, Naoto MIFUNE1990 Volume 63 Issue 1 Pages 43-53
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn this paper, we study fatigue fracture patterns, relationship between the direction of fracture propagation and formation of layer structures, tear resistances, crack resistances at a notch tip produced by repeated stretching, relationship between the direction of crack propagation and formation of layer structures about carbon black filled NR, modified IR, SBR and modified SBR which have different orderly structures of polymers, mobility of molecular chains, the number of physical bonds, types of layer structures of three-dimensional stress fatigued sample.
We make it clear that the tendency of layer structures formation is strong and so fracture surfaces exhibit a peeling pattern about NR; but about modified IR which has weak tendency of layer structures formation and about SBR and modified SBR which have no tendency of layer structures formation, cracks propagate perpendicular to the direction of the principal tensile stresses without exhibiting peeling patterns. And tear resistances, crack resistances at a notch tip and the direction of crack propagation correspond to the anisotropic degree of layer structures, namely the ratio of fracture surfaces energies.
In addition, we estimate effects of physical bonds on activation energies by using a mathematical model of layer structures formation about carbon black filled vulcanizates which have different structures and properties.View full abstractDownload PDF (1003K) -
Kunio MORI, Susumu TAKAHASHI, Tsuyoshi KONNO1990 Volume 63 Issue 1 Pages 54-60
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSCuring of polychloroprene with 6-substituted-1, 3, 5-triazine-2, 4-bis-sulfenamide (RTDSA) were studied to improve the schorch stability of CR compounds and the heat stability of CR vulcanizates. RTDSA worked as curing agents in the presence of decomposing agents such as sulfur, polysulfide compounds, resorcinol and dimethylglyoxime and MgO. By the reaction of RTDSA with the decomposing agents, 6-substituted-1, 3, 5-triazine-2, 4-dithiols (RTD) were generated during the curing. Next, RTD reacted with MgO to give the magnesium salts of RTD. CR is cured by the salts. CR of a G type did not need the decomposing agents such as sulfur because the rubber has polysulfide chains in backbone. The curing rate and schorch time were dependant on the chemical structure of RTDSA and the properties of the RTD and amines.
CR products cured by RTDSA had better heat resistance than those by ETU but had little less compression set than those.View full abstractDownload PDF (576K) -
[in Japanese]1990 Volume 63 Issue 1 Pages 61-62
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (259K)
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