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Volume 43, Issue 5
Displaying 1-9 of 9 articles from this issue
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[in Japanese], [in Japanese]1970 Volume 43 Issue 5 Pages 337-346
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (803K) -
[in Japanese]1970 Volume 43 Issue 5 Pages 347-357
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (696K) -
VULCANIZATION OF RUBBERS BY TEREPHTHALOHYDROXAMYL CHLORIDEJ. Hayashi, J. Furukawa, S. Yamashita1970 Volume 43 Issue 5 Pages 358-362
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIt was found that terephthalohydroxamyl chloride is able to vulcanize various kinds of rubber having unsaturated double bond. Gum and carbon black stocks of BR, IR, NR and EPDM were used as the rubber samples. Moreover, the vulcanization was also conducted by dipping rubber sheets compounded with terephthalohydroxamyl chloride in triethylamine-alcohol solution.
As the result, it was found that terephthalohydroxamyl chloride is able to vulcanize the rubbers on heating in the presence or absence of hydrogenchloride acceptors, such as urea, triethylamine, zinc oxide and so on. It was considered that terephthalohydroxamyl chloride was converted into terephthalonitrile oxide in the rubbers to produce vulcanizates by 1, 3-dipolar addition to the double bonds.View full abstractDownload PDF (356K) -
MODIFICATION OF BUTADIENE RUBBER WITH 4-CARBOXYBENZHYDROXAMYL CHLORIDE AS CARBOXYLATION AGENTJ. Hayashi, J. Furukawa, S. Yamashita1970 Volume 43 Issue 5 Pages 363-368
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSHydroxamyl chloride reacts with unsaturated double bond in the presence of hydrogen chloride acceptor or in the absence of it at elevated temperature. This paper deals with the reaction of 4-carboxybenzhydroxamyl chloride (THCA) to prepare carboxylic butadiene rubber. The reaction was carried out with a benzene-methanol mixed solvent in the presence of triethylamine at room temperature for 24 hours or at 50°C for 8 hours.
It was found that carboxyl group could be introduced into the rubber with neither isomerization of the microstructure nor gel formation. The carboxylic butadiene rubber thus prepared was vulcanized with zinc oxide giving a metal-salt vulcanizate having high tensile strength. THCA also reacted with rubber in the solid state by heating the rubber compounded with THCA. The reaction product could be subjected to vulcanization with zinc oxide. However, simultaneous reaction of THCA/zinc oxide with rubber failed to produce a vulcanizate directly from original butadiene rubber.View full abstractDownload PDF (463K) -
NON-SULFUR VULCANIZATION OF NATURAL RUBBER BY A BINARY SYSTEM OF THIURAM COMPOUND AND N-HALOGENOSUCCINMIDEM. Ueno, [in Japanese], J. Furukawa, S. Yamashita1970 Volume 43 Issue 5 Pages 369-373
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSN-chlorosuccinimide (NCS) and N-bromosuccinimide were found to promote thiuram vulcanization. The highest tensile strengths of natural rubber vulcanizates with and without NCS were nearly same, but the cure rate increased with an increasing amount of NCS up to 5.0phr.The heat resistance of the thiuram-NCS vulcanizates to oven aging was found to be better than that of usual sulfur-accelerator vulcanizates. However, the heat resistance of the former decreased with an increasing amount of NCS. The mechanism of vulcanization and the heat resistance properties were discussed.View full abstractDownload PDF (337K) -
Y. Umezawa, M. Hirai, N. Horii1970 Volume 43 Issue 5 Pages 374-378
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDynamic properties of E-BR, solution SBR and SBR were discussed. The results thereof seem to show that E-BR have good road holding and good stopping performance.
To confirm there results tire tests were done. The outlines of tire tests are as follows;
1) Wear resistance of tread using E-BR is about 5-10% better than conventional BR/SBR tread.
2) Stopping performance of tread using E-BR is about 10-15% better than conventioal BR/SBR tread.
3) Driving stablities of tread using E-BR is about 10% better than conventional BR/SBR tread.View full abstractDownload PDF (307K) -
K. Ohkita, T. Tajima1970 Volume 43 Issue 5 Pages 379-384
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSReaction between methyl alcohol labelled 14C and benzoyl peroxide (Bz2O2) in the presence of carbon black was carried out at 50°C.
During the reaction, methyl alcohol converted into formaldehyde via “alcohol radical”.
In this study, the “alcohol radical” fixed on carbon black surface was determined by the method of radiotracer techniques. For example, Philblack O had contained the radical of 3×1019 per gram of carbon black, but the combination of benzoate radical (BzO•) on the surface of carbon black was negligible.
The phenomenon is different from that of the reaction using benzene or carbon tetrachloride as a solvent in which BzO• fixed on carbon black surface is found.
On the other hand, using 2, 2′-azobisisobutyronitrile as an initiator, monomers such as styrene or vinylacetate were easily converted into polymers in the presence of carbon black, but in the case of Bz2O2, polymerization of monomers was strongly retarded.
The phenomena mentioned above may be attributed to competitive reactions of free radicals generated from initiators with monomers and the terminal groups on the carbon black surfaces.View full abstractDownload PDF (504K) -
(PART II) DURABILITY OF AUTOMOBILE TIRE TREAD (1)S. Kusamizu, Y. Hirose, K. Ninomiya1970 Volume 43 Issue 5 Pages 385-397
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSTaking the strain-at-break vs. temperature diagram (γb-T diagram) as a principal measure for the durability of an automobile tire tread, two typical groups of commercial tires were tested to examine the degree of optimization in their product quality. One group consisted of tires for passenger cars (7.00-13.6PR or so) including both domestic and imported products, whereas the other did of ones for truck and buses (10.00-20.14PR) from six domestic factories.
The shapes of γb-T diagram were found to be more or less the same for tires belonging to the same group, and thus the product quality of the automobile tire tread seemed to converge fairly well towards the optimum as a commercial product.
Comparison of the average shapes of γb-T diagram from those two groups showed that the temperature at which the strain-at-break reached its maximum, Tmax, was much higher for one of the truck and bus than one of the passenger car. It was then shown that the higher the value of Tmax, resulted in the better quality in the heavy duty durability of the tire tread.
The contributions from the species of base polymer and also from the curing system used to the value of Tmax of a vulcanizate were briefly discussed.View full abstractDownload PDF (1172K) -
[in Japanese]1970 Volume 43 Issue 5 Pages 398-399
Published: 1970
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (224K)
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