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Volume 52, Issue 12
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1979 Volume 52 Issue 12 Pages 729-737
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
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[in Japanese], [in Japanese]1979 Volume 52 Issue 12 Pages 738-746
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDownload PDF (1134K) -
[in Japanese]1979 Volume 52 Issue 12 Pages 747-755
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDownload PDF (1184K) -
[in Japanese]1979 Volume 52 Issue 12 Pages 756-763
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
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PREPARATION OF LIQUID RUBBER FROM SCRAP TIRE TREATED WITH PHENYL HYDRAZINE IRON (II) CHLORIDE SYSTEMNariyoshi KAWABATA, Yoshiaki NISHIGAKI, Shinzo YAMASHITA1979 Volume 52 Issue 12 Pages 764-767
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSIn the preparation of a liquid rubber containing carboxyl group from scrap tire by ozonization, the treatment of the scrap tire with phenylhydrazine-iron (II) chloride system prior to the ozonization increased both the yield and the intrinsic viscosity of the liquid rubber.View full abstractDownload PDF (539K) -
Nariyoshi KAWABATA, Takumi MURAKAMI, Shinzo YAMASHITA1979 Volume 52 Issue 12 Pages 768-773
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDegradation of gum vulcanizates of synthetic isoprene rubber by the copper (I) chloride-tributylamine system was investigated.Since the degradation was much faster in the atmosphere than in benzene solution, and the infrared spectrum of the soluble fraction obtained by the degradation indicated the presence of hydroxyl and carbonyl groups, the degradation was found to be an oxidative degradation by the atmospheric oxygen. Judging from the decrease of network chain density and the increase of soluble fraction, the vulcanized rubber was concluded to undergo the degradation by the reagents in the following order of ease: sulfur vulcanizate (IR-Sx) mainly crosslinked by di-and polysulfide linkage>the vulcanizate prepared with tetramethylthiuram disulfide and zinc oxide (IR-S1) mainly crosslinked by monosulfide linkage>organic peroxide vulcanizate (IR-S0) crosslinked by carbon-carbon bond. Analysis of the relation between soluble fraction and decrease of network chain density according to the theory of Horikx indicated that both the severance of crosslinks and the scission of main chain are important in the degradation of IR-Sx and IR-S1, while the scission of main chain is predominant over the severance of crosslinks in the degradation of IR-S0.View full abstractDownload PDF (834K) -
Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Junji FURUKAWA1979 Volume 52 Issue 12 Pages 774-777
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSIn seeking for the useful reclaiming agents for conventional mechano-chemical procedure organic sulfur and their amine compounds which are usually employed as an accelerator for vulcanization were tried on a crushed tire scrap of passenger cars.
Consequently, 2-rnercaptobenzothiazolea nd its cyclohexylamines alt were found to be the most effective reclaiming agents for conventional inechano-chernical procedure.The Mooney viscosity of the reclaimed rubbers treated with these agents showed the considerably low value of 36 and 22, respectively.Thereclaimed rubbers could be revulcanized with the use of a conventional sulfur-accelerator vulcanizing system and the tensile properties of the vulcanizates obtained were superior to those of a commercially reclaimed one.View full abstractDownload PDF (575K) -
Shinji INAGAKI, Yukio ONOUCHI, Hiroshi OKAMOTO, Junji FURUKAWA1979 Volume 52 Issue 12 Pages 778-783
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSThe stress-strain curves of NBR vulcanizates compounded with plasticizers and reactive oligomers were analyzed by our proposed elastic equation and the Mooney-Rivlin equation. Plasticizers employed in this study are dioctyl phthalate, ditridecyl phthalate, dioctyl adipate and tricresyl phosphate. The reactive oligomers were synthesized by the telomerization of styrene with carbon tetrachloride, and their molecular structure is represented as Cl3-(-CH2CH-) n-Cl. In the earlier papers, we have reported that these oligomers act as the plasicizer for synthetic rubbers. It was recognized that the presented equation could as well explain many experimental facts as with pure rubber vulcanizates. The parameters, such as vkT, b. C1 and C2 are obtained from the plot of the proposed equation and the Mooney-Rivlin plot. For the Plasicizer-NBR system, vkT and C1 merely decreased, while v and C2 steeply decreased with increasing plasicizer amount (x). The linear relationship was obtained from the plot between (1-x) 2/b or C2 and x. From these results, it seems that the weak pseudo-crosslinks in rubber vulcanizates are broken down by means of the solvation between rubber segments and plasticizers.
On the other hand, for the reactive oligomer-NBR system, these parameters increased with increasing oligomer amounts. This result shows that the reactive oligomers contribute to the formation of the primary crosslink and the pseudo-crosslink by the reaction or the interaction with rubber segment. Thus it seems that the reactive oligomers act as the reactive plasicizer for rubbers.View full abstractDownload PDF (675K) -
1979 Volume 52 Issue 12 Pages 784-785
Published: December 15, 1979
Released on J-STAGE: March 05, 2013
JOURNAL RESTRICTED ACCESSDownload PDF (333K)
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