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Predecessor
Volume 51, Issue 5
Displaying 1-12 of 12 articles from this issue
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[in Japanese]1978 Volume 51 Issue 5 Pages 273-279
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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[in Japanese], [in Japanese], [in Japanese]1978 Volume 51 Issue 5 Pages 280-291
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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[in Japanese]1978 Volume 51 Issue 5 Pages 292-302
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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1978 Volume 51 Issue 5 Pages 303
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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1978 Volume 51 Issue 5 Pages 304-305
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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1978 Volume 51 Issue 5 Pages 306-307
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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1978 Volume 51 Issue 5 Pages 308
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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1978 Volume 51 Issue 5 Pages 309
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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Yuji MINOURA, Shinzo YAMASHITA, Hiroshi OKAMOTO, Masayoshi SUGURI, Yos ...1978 Volume 51 Issue 5 Pages 310-316
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSThe telechelic liquid polybutadiene rubber with hydroxyl group HT-PB is generally crosslinked with diisocyanates and is reinforced with such fillers as carbon black and white carbon which usually contain the water which is liable to react with diisocyanates.The effects of the water adsorbed on these fillers on the physical properties of vulcanized HT-PB compounds were studied.
The tensile properties of the pure gum vulcanizate and carbon black filled vulcanizate were largely changed by the water content within the scope of0.1%.Beyond0.1%these properties attained nearly constant values.On the other hand, the tensile properties of white carbon filled vulcanizate were largely unchanged by the presence of a little amount of water, although the properties were largely changed by much water.The hardness and modulus indicated the same tendency as the tensile properties.
The tensile properties of these vulcanizates varied with the ratio, r(=[NCO]/([OH] HT-Pb+ [H2O])). The best tensile properties of the pure gum vulcanizate or the carbon black filled vulcanizate were obtain-able at ranging from 1.0 to 1.3, and those of the white carbon filled vulcanizate were at r0.8.The reac-tion of the isocyanate with water in the white carbon filled stock seems to be slower than that in the carbor black filled stock.View full abstractDownload PDF (674K) -
Shinzo YAMASHITA, Hiroshi OKAMOTO, Yuji MINOURA, Jiro CHOSOKABE, Yutak ...1978 Volume 51 Issue 5 Pages 317-323
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSHydroxyl terminated liquid butadiene rubber (HT-PB) was compounded with polyvinyl alcohol powder (PVA) and was cured with 4-4-diisocynate-diphenyl methane (MDI).The tensile strength of cured product was remarkably improved by loading PVA and increased with an increasing diisocyanate concentration or with loading PVA having about 100-Ein average particle size.The cured product loaded with 20vol%of PVA was extracted with water to show that the extract is PVA alone and that the amount is about 80wt%of PVA loaded in HT-PB.View full abstractDownload PDF (795K) -
Tadao OHKITA, Takashi KOBAYASHI1978 Volume 51 Issue 5 Pages 324-329
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
JOURNAL FREE ACCESSWe reported previously that rubbers could not be cured with dihenzothiazyl disulfide alone, but cured when dibenzothiazyl disulfide and N, N-diethylthiocarbamoyl-2-benzothiazoyl sulfide or benzothiazole sulfenamide were used together.
In this paper, copper plate or wire was immersed in a liquid paraffine containg these accelerators and the solution was heated at curing temperature for several hours.The surface of copper changed to black when the accelerators were curable and it did not change when the accelerators were not curable.
These phenomena may be related to the mechanism of cure by these accelerators.The black precipitate on the surface of copper was analyzed.The ratios of carbon, nitrogen and sulfur in it varied with the kind of the accelerators used or its quantity.The degree of blackness of copper seems to be related to the difficulty of cure.View full abstractDownload PDF (5707K) -
1978 Volume 51 Issue 5 Pages 330-331
Published: May 15, 1978
Released on J-STAGE: March 05, 2013
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