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Predecessor
Volume 66, Issue 8
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1993 Volume 66 Issue 8 Pages 519-529
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1993 Volume 66 Issue 8 Pages 530-540
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 8 Pages 541-542
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (238K) -
1993 Volume 66 Issue 8 Pages 543-544
Published: 1993
Released on J-STAGE: July 09, 2007
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Kazuo NISHIMOTO, Yasutaka NAGAI, Tetsuo AKIYAMA, Naoto MIFUNE1993 Volume 66 Issue 8 Pages 545-551
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThis paper applies the fractal theory to analyse the surface crazing pattern of the degraded styrene-butadiene rubber (SBR) vulcanizate. The degradation was performed by means of outdoor exposure and two different weatherometers. Using a box counting method the surface crazing pattern was shown to have two fractal dimensions, which increased with the exposure time regardless of the weathering test methods employed. However, the fractal dimensions varied with the weathering test method, suggesting that the geometrical structure of the surface crazing pattern is dependent on the test methods. The data of fractal dimensions are shown to be fitted to a linear equation with the specific crazing area which is known to be an index of the degradation of the SBR vulcanizate.View full abstractDownload PDF (2066K) -
Hidetoshi Hirahara, Yoshiuki Ooishi, Kunio Mori1993 Volume 66 Issue 8 Pages 552-562
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSFluorinated rubber (FKM) was cured by using 1, 3, 5-1 triazine-2, 4, 6-trithiol tetrabuty ammonium salt (TTBA) as same to the polyol curing systems. Direct adhesion between nickel platings and FKM was successful by using TTBA as a curing agent. Peel strength in the adherends were influenced by the amount of TTBA. The decrease in pell strength after post cure due to decrease of interfacial bonds between nickel and FKM in the adherends. From Kraus plots in the nickel powder-FKM composites containing TTBA, first order bonds was confirmed to form in the interface between nickels and FKM. The concentration of sulfer at nickel plating-FKM adherends interface were observed to increase from XMA analysis. The above results suggest that TTBA works as a binder which bonds between nickel platings and FKM. Nickel plating-FKM adherends had excellent oil, water and heat resistance.View full abstractDownload PDF (1074K) -
Takashi SATO1993 Volume 66 Issue 8 Pages 563-571
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSA new phenomenological mechanical model was proposed to analyze stress-strain curves (S-S curves) of rubber materials. This model is available to fit experimental data from λ=1 to breaking point of S-S curves, where λis a stretch ratio. The stress f in this model is written as follows: f=K1(λ-1/λ2)[1-B{1-exp(-λ-1/L1)}]+K2(λ-1)M exp(-λ-1/L2)
where, K1, B, L1, K2, M, and L2 are the parameters of this model. The first term of this formula shows rubber elasticity component, and the second term shows orientation component. The characteristics of this model is an introduction of effective cross-sectional areas of A1 and A2, which are independent functions of λ. As the result, this model could analyze the S-S curve of rubber materials containing fillers of 0_??_0.36 volume fraction.View full abstractDownload PDF (907K) -
Noriaki WADA, Yoshitaka UCHIYAMA, Makoto HOSOKAWA1993 Volume 66 Issue 8 Pages 572-584
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSWear properties between short fiber reinforced chloroprene rubber (SFRR) composites and an abrasive cloth were examined in the various directions of the oriented polyamide fibers. When the oriented fibers incline at an angle θ to the sliding surface, minimum wear rate was obtained at the angle of 105 degrees. Maximum wear rate was observed at 0 or 180 degrees. The minimum wear rate at the angle of 105 degrees was realized when the abraded surface was largely covered with the reinforced fibers. When the oriented fibers are parallel to the mating surface and have an angle θ' to the sliding direction, minimum wear rate was obtained at the angle of 0 degree, whereas maximum wear rate was observed at 90 degrees. The maximum wear rates at 90 degrees was caused by cutting of the reinforced fibers across their axes and the easy detachment of the chopped fibers from the chloroprene matrix.
Wear properties of various kinds of SFRRs were also examined when the SFRRs were rubbed against metal gauze respectively in the longitudinal (L), transverse (T) and normal (N) directions of the oriented fibers. The difference in the wear rate between the SFRRs and the unreinforced chloroprene rubber was markedly observed. The minimum wear rate was obtained for rubbing in the N direction of the SFRR reinforced by p-aramid fiber. The wear rate did not depend on the amount of bonding agent applied to the fiber. The wear resistance of the SFRRs was largely improved by adding the fibers that show low wear rates. The high compression modulus of the SFFF also yields a small contact area between the rubber pin and the metal gauze. Therefore the reduction in the wear rates was realized by the small contact area and the low wear rates of the reinforced fibers.View full abstractDownload PDF (3461K) -
Tomohiro KURAMOCHI, Masanori HIRAMOTO, Takehiko KIKUCHI, Masaru IBONAI1993 Volume 66 Issue 8 Pages 585-590
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSHSIS-g-MMA graft polymer was prepared by graft polymerization of metyl methacrylate (MMA) onto styrene hydrogenated isoprene triblock polymer (HSIS). We studied mechanical property of graft polymer and blend polymer which was blended graftpolymer and PMMA. The tensile strength of graft polymer was fast increased untill about 10% grafting and then slowly increased in proportion to the rise in its grafting, but the tensile impact strength of graft polymer decreased in proportion to the rise in its grafting. Blend polymer was prepared by the various ratio of PMMA and graft polymer with various grafting. Tensile impact strength of blend polymer which included 10% graft polymer with high grafting showed highest value. As result of these, graft polymer with low grafting modified tesile strength of HSIS. Blend polymer which included graft polymer with high grafting modified tensile impact strength of PMMA.View full abstractDownload PDF (852K) -
[in Japanese]1993 Volume 66 Issue 8 Pages 591-592
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (254K)
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