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Volume 46, Issue 3
Displaying 1-9 of 9 articles from this issue
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[in Japanese], [in Japanese]1973 Volume 46 Issue 3 Pages 181-192
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese], [in Japanese]1973 Volume 46 Issue 3 Pages 193-200
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese]1973 Volume 46 Issue 3 Pages 201-204
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (262K) -
[in Japanese]1973 Volume 46 Issue 3 Pages 205-215
Published: 1973
Released on J-STAGE: April 16, 2008
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(VII) FATIGUE CHARACTERISTICS OF SBR, NR-LOW MOLECULAR WEIGHT SUBSTANCE MIXTURESKunihiko FUJIMOTO, Iichi INOMATA, Toshio NISHI1973 Volume 46 Issue 3 Pages 216-224
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSCut growth characteristics due to mechanical fatigue of vulcanized pure and carbon black filled SBR, NR-low molecular weight substance mixtures which can be regarded as compatible systems are examined. The cut growth rate of the sample which is obtained by mixing a low molecular weight substance having a higher Tg and consequently a higher viscosity is found to be much slower.
This phenomenon is explained as the reinforcing effect and the retarding effect of the low molecular weight substance which hasa higher Tg or viscosity against translation or rotation and change in the heterogeneous structure of the rubber system.View full abstractDownload PDF (593K) -
Takashi WATANABE, Shigeo IKEDA, Masayuki YAMADA, Setsuya SUGIMOTO1973 Volume 46 Issue 3 Pages 225-231
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSAddition of acrylic-substituted hindered phenols as addition stabilizers to polymers was investigated. Radical homopolymerization of such phenols was carried out first, and it was confirmed that polymerization proceeded without being inhibited by the hydroxyl group in the molecule to yield polymers containing phenolic hydroxyl groups. Following this, radical copolymerization with styrene was undertaken and it was found that the copolymers of the acrylic-substituted phenols and styrene had retained the phenolic hydroxyl groups after purification. On the other hand, di-tert-butyl-p-cresol (DBPC) or allyl-substituted phenols came off the polymers in the purification step. Addition to SBR latex via heat treatment was also attempted and a solvent extract of the addition product prevented formation of gels after ageing, which proved the occurrence of addition to the latex. Moreover, DBPC was nearly completely extracted by the solvent from isoprene rubber (IR) crosslinked with DCP while the acrylicac-substituted phenols remained in the polymers after solvent extraction and improved the resistance to oxidation, which proved addition of the acrylic-substituted phenols to the rubber.View full abstractDownload PDF (544K) -
AN ELECTRON SPIN RESONANCE STUDY OF CARBON BLACK AND RUBBER-CARBON BLACK INTERACTIONSKunihiko FUJIMOTO, Iichi INOMATA, Sizuo FUJIWRA1973 Volume 46 Issue 3 Pages 232-240
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSESR spectra ofspins in carbon black are measured after its surface is mechanically and chemically treated. A distribution model is proposed in which electron spins scarcely exist on the surface of carbon black but most of them collectively exist in 5 to 6Å inner part of the black particle.
There is practically no contribution of electron spins to the chemical reaction of rubber and carbon black. However, a variation in the restriction of electron spins and an increase in the number of electron spins measured by ESR are observed when there is a chemical reaction on the surface of carbon black.
These experimental facts are applied to investigate the vulcanization, thermal aging and mechanical fatigue of carbon black filled rubbers.View full abstractDownload PDF (645K) -
Bound Rubber in IR/BR Blend: (1) Addition of Carbon Black by Openemill MixingMichio ASHIDA, Yuichi INUGAI, Kyosei KOBAYASHI, Teizo WATANABE1973 Volume 46 Issue 3 Pages 241-247
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIR and BR were blended by openemill mixing and the bound rubber obtaiabie was analyzed by means of pyrolysis gas chromatography. When HAF black was added to the preblend of IR/BR, the BR component in the bound rubber was a little larger than the IR component and both components increased with mixing time. When EPC black was added to the preblend of IR/BR, IR occupied a relatively large part of the bound rubber at the first stage of mixing and then it decreased notably as the mixing time increased so that the IR component became less than the BR component. When IR was added to a BR masterbatch, the resulting bound rubber was composed in the great part of BR and hardly of IR. In an early mixing time the blending of IR formed of bound rubber with a constant volume, whose value was higher under the EPC loading than under the HAF loading. Addition of HAF blacks treated thermally showed that bound rubber was independent of the surface acidity of HAF black.View full abstractDownload PDF (545K) -
1973 Volume 46 Issue 3 Pages 248-249
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (213K)
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