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Predecessor
Volume 58, Issue 1
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1985 Volume 58 Issue 1 Pages 1
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese]1985 Volume 58 Issue 1 Pages 2
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (64K) -
[in Japanese], [in Japanese]1985 Volume 58 Issue 1 Pages 3-15
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese]1985 Volume 58 Issue 1 Pages 16-25
Published: 1985
Released on J-STAGE: April 16, 2008
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Norio TSUBOKAWA, Hitoshi SHIRASAKA, Yasuo SONE1985 Volume 58 Issue 1 Pages 26-32
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIn the presence of polystyrene-grafted (CB-PS), poly (methyl methacrylate)-grafted (CB-PMMA), polyester-grafted (CB-PEs), and poly-β-alanine-grafted (CB-PAL) carbon black, the polymerizability of styrene using benzoyl peroxide as an initiator was investigated. A marked retardation of the polymerization was observed in the presence of ungrafted carbon black. The retardation by carbon black was not disappeared even if the oxygen containing groups present on the carbon black such as phenolic hydroxyl and quinonic oxygen groups were blocked by the treatment of carbon black with 2, 2' -azobisisobutyronitrile and diazomethane. On the contrary, in the presence of above polymer-grafed carbon black, the ability of retardation of the carbon black decreased gradually with an increase in grafting ratio of the polymer. In particular, in the presence of CB-PAL (grafting ratio=90.0%), the retardation almost completely disappeared. These phenomena suggested that the oxygen containing groups and benzonoidal rings on the surface were blocked by the grafted polymer chanins. The ratio of decrease of retardation was found to increase in the following order: CB-PS<CB-PMMA<CB-PEs_??_CB-PAL. This order was in agreement with that of decreasing solubility of the grafted polymer in styrene monomer.View full abstractDownload PDF (535K) -
Yoiti Minematu1985 Volume 58 Issue 1 Pages 33-38
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSPhotoelectric measurement procedures for the determination of spectral irradiance of light sources used for the weatherability test of polymer materials in comparison with the spectral irradiance standard bromine lamp (continuous spectrum) were given. Spectral irradiance of light sources having a continuous spectrum Eλ Wm-2nm-1) may be calculated by proportional relation of photocurrent, but when light sources to be measured have a line spectrum, it is necessary to know the band width of monochrometor used to calculate the spectral irradiance of each line spectrum E(λ) (Wm-2). The effect of tempetature to the spectral sensitivity of photo-multiplier tube (PMT) R 106 was determined, and it was found that stable monitor measurement can be made even when ambient tempetature fluctuate considerably as in the polymer exposure station, as long as the temperature of PMT is automatically regulated to about 30°C.View full abstractDownload PDF (429K) -
EXPRESSIONS FOR BULK STRESS AND MODULUS DERIVED IN TERMS OF INTERNAL FIELDSYoshiyasu SATO1985 Volume 58 Issue 1 Pages 39-45
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSTheoretical predictions are given on mechanical properties of heterogeneous materials, such as filler-loaded rubber vulcanizates, polymer blends and block copolymers with particle dispersed structure, in terms of a method previously proposed for the analysis of three dimensional internal deformations and local stresses fields in particle dispersed elastomer under large deformation. Influences of internal factors (: disperse structure, difference in rigidity between particle and matrix, distribution of internal deformations and local stresses, etc.) on external quantities such as bulk stress and modulus of the sample are examined with hypothetical samples and an understanding of the effects, especially reinforcement effect, is gained.View full abstractDownload PDF (539K) -
WEAR OF RUBBERS BY ROLL-FORMATIONYoshitaka UCHIYAMA1985 Volume 58 Issue 1 Pages 47-60
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIn order to examine the mechanisms of wear by roll-formation wear experiments were made between rubber erasers which worn easily by roll-formation and glass disks. The necessary conditions for wear by roll-formation were determined, and the mechanisms of roll-formation were examined observing the rubbing surface.
At low contact pressure and low sliding speed wear rates of rubber erasers were low and wear by roll-formation did not occur. Then transferred films were only observed on the mated glass disk. If fragments were formed they were extended to films. These films were not so easily detached from the rubbing track.
Above critical contact pressures and critical sliding speeds wear by roll-formation took place and the wear rates were high. When the elongation, strength and hardness of rubber erasers were low, the rolls were also easily formed. Then the small fragments were made at the initial stage and travelled on the rubbing surface by rolling which contained slipping. They increased in size after joined together because each speed was different. Some fragments rolled the films. A few large fragments divided into some parts but the combination of fragments dominated the break-up of fragments. The enlarged fragments were detached in front of the rubber pin when about to re-enter the rubbing surface. Thus the wear rates were high when the wear by roll-formation took place.View full abstractDownload PDF (1843K) -
1985 Volume 58 Issue 1 Pages 61-62
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (144K)
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