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Predecessor
Volume 49, Issue 8
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1976 Volume 49 Issue 8 Pages 605-610
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDownload PDF (8077K) -
[in Japanese], [in Japanese]1976 Volume 49 Issue 8 Pages 611-619
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDownload PDF (7376K) -
Hiroshi OKAMOTO, Junji FURUKAWA, Shinji INAGAKI1976 Volume 49 Issue 8 Pages 620-627
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSIn the previous paper, the following equation obtained on the basis of an average molecular chain could explain the behavior of stress-strain curve of sulfur cured natural rubber which was reported by L. Treioar over almost the entire region of deformation similarly to James-Guth's equation.
f=kT (αm/2ln1+α/αm/1-α/αm-1/α2)
In the present paper, applicability of the presented equation was examined on the cases of peroxide and sulfur cured natural rubber prepared under various conditions.
Accoriling to the result of various experiments, the presented equation may explain satisfactorily both the extension and retraction curve of hysteresis cycles under various conditions.Some discrepancies, however, were recognized at the points of small and extremely large deformations.View full abstractDownload PDF (665K) -
Hiroshi OKAMOTO, Shinji INAGAKE, Junji FURUKAWA1976 Volume 49 Issue 8 Pages 628-636
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSApplicabiliotfyt hef ollowinegq uationw hichh ad beeno btainedo n theh ypothesoisfa n averagnee twork chainw ase xaminewd itht hec aseso fp eroxidaen dv ariouasc celerators-sulcfuurre dS BRp reparedu nderv ariousp ressc uringc onditions.f=kT (αm/2ln1+α/αm/1-α/αm-1/α2) +b
For unfilled SBR vulcanizates, both the peroxide curing and the various accelerators-sulfur curing systems, good linear relationship was confirmed though in the region of large deformation /α>3 it was not applicable for the Mooney-Rivlin equation. In almost all cases some deviations from a straight line were observed at the positions of a small and an extremely large deformation and a straight line did not pass through the origin. As a result of these experiments varying the concentration of curatives, the front factor k of the equation is recognized as a parameter that is proportional to the network chain density and it is also associated with the C1 term of the Mooney-Rivlin equation. The relation between an additional term b of the presented equation and C2 term of the Mooney-Rivlin equation was checked for various kinds of curing system vulcanizates. But the correlation between them is not obvious at present stage.View full abstractDownload PDF (845K) -
Hiroshi OKAMOTO, Shinji INAGAKI, Junji FURUKAWA1976 Volume 49 Issue 8 Pages 637-642
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSApplicability of the following equation which had been obtained on the hypothesis of an average network chain was examined with the cases of unfilled BR, EPDM and PBR (propylene-butadiene alternative copolymer) vulcanizate prepared from peroxide and various accelerators-sulfur curative systems.
f=kT (αm/2ln1+α/αm/α/αm-1/α2) +b
Good applicability of the presented equation for many experimental data was confirmed from both the extension and the retraction curve of hysteresis cycle even in the region of large deformation (α>3).The relation between C1 term of the Mooney-Rivlin equation and the front factor k or k (for the value of a retraction curve) in the presented equation, and between C2 term of the Mooney-Rivlin equation and an additional term b or b (for the value of a retraction curve) of the presented equation was discussed on the basis of the experimental data.The front factor k or kwas recognized as a parameter that is proportional to the network chain density and C1 term of the Mooney-Rivlin equation in analogy with the case of SBR vulcanizate.An additional term b is correlated with C2 term for BR vulcanizate but the correlation is yet to be established for EPDM and PBR vulcanizate.View full abstractDownload PDF (490K) -
Khoichi TSUGE, Kenjiro HASHIMOTO, Tadao MATSUO1976 Volume 49 Issue 8 Pages 643-647
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSThe identification of various polyol and diisocyanate components in polyurethane elastomers was studied.
1) The polyol components in polyurethane elastomers were identified by the charactaristic peaks obtained by direct pyrolysis in carrier stream of gas chromatography.
2) The diisocyanate components in polyurethane elastomers were converted into diamines by hydrolytic degradation under pressure and detected in extracted ether solution by gas chromatography.
3) The method described here is simple, quick and practical for the identification of polyol and diisocyanate components in polyurethane elastomers.View full abstractDownload PDF (562K) -
[in Japanese], [in Japanese], [in Japanese]1976 Volume 49 Issue 8 Pages 648-651
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSDownload PDF (2734K) -
1976 Volume 49 Issue 8 Pages 652-653
Published: August 15, 1976
Released on J-STAGE: March 05, 2013
JOURNAL RESTRICTED ACCESSDownload PDF (287K)
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