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Volume 48, Issue 11
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1975 Volume 48 Issue 11 Pages 665-672
Published: 1975
Released on J-STAGE: April 16, 2008
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[in Japanese]1975 Volume 48 Issue 11 Pages 673-678
Published: 1975
Released on J-STAGE: April 16, 2008
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[in Japanese]1975 Volume 48 Issue 11 Pages 679-685
Published: 1975
Released on J-STAGE: April 16, 2008
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[in Japanese]1975 Volume 48 Issue 11 Pages 686-691
Published: 1975
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (534K) -
[in Japanese]1975 Volume 48 Issue 11 Pages 692-704
Published: 1975
Released on J-STAGE: April 16, 2008
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PEROXIDE VULCANIZATION OF LIQUID POLYBUTADIENESTatsuo OKAYA, Koichi HAYAKAWA1975 Volume 48 Issue 11 Pages 705-715
Published: 1975
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSLiquid PB having various structures were cured with dicumyl peroxide.
Curing curve, infrared spectrum, degree of swelling, crosslinking density, crosslinking efficiency, double bond concentration, double bond consumption efficiency and sol-gel fraction were measured. The ratio of network chain formation per radical to double bond consumption per radical was also calculated.
The vulcanizate of 1, 2-PB was very high in crosslinking density and consumption of double bond. The crosslinking is supposed to proceed by a chain reaction propagated with pendant vinyl groups.
The vulcanizate of 1, 4-PB had a small crosslinking density and a large amount of residual unsaturation. The curing is presumed to proceed by an abstraction of allylic hydrogens.
1, 2-PB containing terminal acrylic groups showed the highest curing rate and crosslinking density. The molecular weight between crosslinks approximated to a butadiene unit.
Hydrogenated 1, 2-PB containing acrylic end groups were also cured very rapidly, but the crosslinking density was moderate.
It is supposed that highly active acrylic end groups react by a chain mechanism to yield secondary large molecules, which then crosslink intra- and intermolecularly.View full abstractDownload PDF (738K) -
s-TRIAZINE MERCAPTIDESYoshiro NAKAMURA, Kunio MORI, Kenji HASEGAWA, Takaomi SAITO1975 Volume 48 Issue 11 Pages 716-721
Published: 1975
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSFrom the determination of oxygen absorbed and the gel in the mercaptide-containing polyepichlorohydrin (CHR) vulcanizate after ageing in oxygen atmosphere at 175°C for 8hr, Cu-, Zn-, and Cd-mercaptides of thiol-s-triazine are found to show an excellent antioxidative activity. Among them, Cu-mercaptide of 2-anilino-4, 6-dithiol-s-triazine, and a mixture of the Zn-mercaptide with TBC are the most effective. As these mercaptides are hardly soluble in the organic solvents and have a high decomposition temperature, a similar antioxidative activity is observed at 160-175°C with the vulcanizate which has been extracted with the organic solvents. Such a non-migrating property of the mercaptides can not be expected from the well known antioxidant e.g. NBC and D. The reaction mechanism of the novel antioxidant was discussed from results of ir spectra of the aged CHR and from its activity as hydroperoxide-decomposer and radical-scavenger.View full abstractDownload PDF (400K) -
[in Japanese]1975 Volume 48 Issue 11 Pages 722-723
Published: 1975
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (233K)
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