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Predecessor
Volume 40, Issue 2
Displaying 1-8 of 8 articles from this issue
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PART I. MODIFICATION OF SMITH'S METHOD OF REDUCED VARIABLES FOR ULTIMATE PROPERTIESS. Kusamizu, K. Ninomiya1967 Volume 40 Issue 2 Pages 81-90
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSSmith's method of describing the temperature- and the extension rate- dependences of the ultimate properties of vulcanized rubbers is somewhat modified to reserve the general applicability. As for the stress at break and the horizontal shift factor, log aT, respectively, that defined as true stress and that obtained separately from the data on the loss tangent measurements are recommended instead. Besides the horizontal shift factor, a vertical shift factor, log bT, is newly introduced to form a logarithmic composite plot of strain at break versus extension rate from the data obtained at various temperatures.
That the failure envelope is not a material function for the rupture characteristics but is to be regarded as a material function for the non-linearity of the elasticity is pointed out, though it appears to be suitable for its name.View full abstractDownload PDF (1714K) -
PART I. GAMMA-RADIATION-INDUCED GRAFT POLYMERIZATION OF LATICESJ. Tsurugi, T. Fukumoto, M. Yamagami, G. Syobayashi, S. Yabuta1967 Volume 40 Issue 2 Pages 91-99
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSNR or SBR latex was mixed with acrylonitrile (AN) by using emulsifiers and was irradiated with gamma rays. Hundreds of grams of rubbers with different grafting ratios were thus produced. Two emulsifying procedures, i. e., (i) adding AN to the latex which contains the emulsifier in advance (ii) adding a mixture of AN and emulsifier to the latex, were adopted. The grafting effect on physical properties of grafted rubbers, their stocks and vulcanizates is greater when produced by the procedure (ii) than by the procedure (i). On the other hand, NBR was blended with NR or SBR. The AN contents of blended rubbers were made equal to those of the grafted rubbers. Some physical properties of blended rubbers, their stocks and vulcanizates vary in approximate proportion to blending ratio. In contrast, these properties of grafted rubbers, stocks and vulcanizates make sudden changes with increasing grafting ratio. The vulcanizates from grafted polymers have, in general, higher resilience and lower oil resistance than those from the corresponding blended polymers.View full abstractDownload PDF (1355K) -
PART II. GAMMA-RADIATION-INDUCED GRAFT POLYMERIZATION OF LATICESJ. Tsurugi, T. Fukumoto, M. Yamagami, G. Syobayashi, S. Yabuta1967 Volume 40 Issue 2 Pages 100-102
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSNR or SBR latex mixed with acrylonitrile by the procedure (i) mentioned in the previous paper was irradiated with gamma-rays yielding rubbers with different grafting ratios. On the other hand, blended polymers, of which the acrylonitrile contents were made equal to the grafted polymers respectively, were produced by blending NBR with NR or SBR. Comparison of physical properties of compounded stocks and vulcanizates of grafted polymers with those of the corresponding blended polymers gave similar results to those reported in the previous paper.View full abstractDownload PDF (523K) -
PART IV. LOW TEMPERATURE BEHAVIOR OF RUBBER VULCANIZATESY. Takano, H. Tanno, H. Samejima1967 Volume 40 Issue 2 Pages 103-115
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe mutual solubility of the elastomer blendings used popularly were studied with behavior of relaxation modulus at low temperatures. In addition, the improvement on the low temperature characteristics of CR and NBR was studied by blending with rubbers having cold resistance.
The elastomer blends studied in this paper were as follows, NBR-NR, NBR-SBR, NBR-BR. CR-NR, CR-SBR, CR-BR. SBR-NR and BR-SBR.
Electron microscopic studies of the replication method on cut section of frozen NBR-NR blend revealed a micro-ununiform dispersion, and the island-phase of NBR particles having several μ in diameter afloated on the sea-phase of NR, and also showed the phase displacement in the range of 0.60.8 blending ratio of NBR.
Considering from the time-dependence of relaxation modulus, it apparently seemed that there was phase separation in the blend. But the behavior was slightly different from that of the simple mechanical blended materials. The phase separation similar to NBR-NR was observed in the blends such as CR-NR, NBR-BR, NBR-SBR, CR-SBR, and CR-BR, whereas SBR-BR blend showed better mutual solubility, and NR-SBR blend slightly good.The practical method preventing the hardening due to the crystallization of NR or CR at low temperature is not found yet to date, however, the blending of non-crystallizing rubber having good mutual solubility with NR or CR remarkably decreased the crystallization rate of them.View full abstractDownload PDF (7192K) -
1967 Volume 40 Issue 2 Pages 115
Published: 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (169K) -
[in Japanese]1967 Volume 40 Issue 2 Pages 116-122
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (1225K) -
[in Japanese]1967 Volume 40 Issue 2 Pages 123-137
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (2596K) -
1967 Volume 40 Issue 2 Pages 138-139
Published: February 15, 1967
Released on J-STAGE: October 16, 2009
JOURNAL RESTRICTED ACCESSDownload PDF (243K)
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