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Volume 56, Issue 12
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1983 Volume 56 Issue 12 Pages 753-762
Published: 1983
Released on J-STAGE: July 09, 2007
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[in Japanese]1983 Volume 56 Issue 12 Pages 763-767
Published: 1983
Released on J-STAGE: July 09, 2007
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THE MECHANICAL PROPERTIES AND SWELLING OF SHORT FIBER-CR COMPOSITESToru NOGUCHI, Michio ASHIDA, Satoshi MASHIMO1983 Volume 56 Issue 12 Pages 768-775
Published: 1983
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe mechanical properties and the solvent swelling of unidirectional fiber-CR composites were examined by using PET and nylon 6 filaments of various lengths and diameters. Short, individual filaments of PET and nylon 6 were mixed into a CR stock in a Bunbury. The nylon 6 filaments were bent over and those less than 19μm in diameter were broken into fragments, which resulted a little poor orientation. The PET filaments of 21μm in diameter achieved good dispersion and high degree of orientation. For the composites without RFL, a region of large yielding occured at a stress level of approximately 10MPa and extended over a large portion of the strain range. The stress-strain curves for the composites with RFL treated fiber were nearly linear and demonstrated very high modulus and low elongation at break. The composites with RFL treated fiber resisted solvent swelling in the longitudinal direction of fiber.View full abstractDownload PDF (1079K) -
Shunryo KUSAKA1983 Volume 56 Issue 12 Pages 776-783
Published: 1983
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIt is impossible to take a roll kneading process in blending of water in raw materials compounds batch when we make of soft PVC sheet, leather cloth or sponge leather cloth.
There are reasons that it is incompatible in compounds batch, water is evaporating out from PVC film or sheet in processing at 150°C and becomes unevenness on surface of the products.
In this report, the author noted to a phenomenon of hazing or felt a slightly soften of PVC product influenced by water.
Preparing of PVC sponge leather cloth, and it make to absorb water to the leather cloth, and observed some effects as a softner of water for the leather cloth.
That is, PVC sponge leather cloth is dipped in hot water, it makes to soften at high temperature-it accelerate micro-Brownian motion actively - and tried to absorb water to PVCs ponge leather cloth used as a carrier of plasticizer, stabilizer and the other additives or a partially decomposed materials included in PVC sponge leather cloth.
It was cleared the following results to soften of PVC sponge leather cloth dipped in hot water.
(1) Degree of softness becomes larger according as in higher temperature of water.
(2) Degree of softness becomes larger in agitation than in statical state.
(3) Regardless of temperature, absorption of water reached to equilibrate at about 12 minute.
(4) Absorption of water was about 11-12% at a reasonable conditions, that softning effect was corresponded to use same quantity of plasticizer for PVC layer.
(5) Temperature of dipping water are desirable at maximum temperature as a degree of no change of appearance of a product, that is effective at about 60°C of around of second order transition point.
(6) Absorbed water keeping terms in a product is 2 years over.
(7) Softnning of base cloth are not contribute to soften for PVC layer. However, it is no factor as minus for PVC layer.
Above mentioned, it would be say that hot water dipping treatment of PVC sponge leather cloth are practical application.View full abstractDownload PDF (806K) -
Tadaoki OKUMOTO, Masatoshi SUGIMOTO, Masayoshi ICHIKAWA1983 Volume 56 Issue 12 Pages 784-793
Published: 1983
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe inner tube rubber of hoses used in the fuel line is expected to be improved in its performance concerning with the heat aging, sour gasoline and alcohol containing gasoline (gasohol) resistance. One of the best materials to fulfil the conditions mentioned above is fluorocarbon rubber (FKM), but unfortunately it is very expensive. Nitrile rubber (NBR) has been widely used in the inner tube of fuel hoses as an oil resistant materials. The physical properties of NBR could be improved by blending with FKM if the FKM phase maintains continuous structure in the heterogeneous blend. Among various commercially available NBR and FKM, a high acrylonirile content NBR and two high fluorine content FKM′s (Viton B-50, Viton GH) were used as materials. In the blend systems of NBR/Viton B-50, both NBR and FKM zone are co-continuous up to around the blend ratio of 50/50. However above 60% volume of Viton B-50, only FKM zone become continuous. Both% elongation change and % tensile strength change show remarkable decrease with increase of FKM content. In other words, the heat aging and sour gasoline resistance of the vulcanizates were improved for the blends above 60% volume ratio of Viton B-50. On the other hand, the morphology in the blends of NBR/Viton GH is strikingly different from that of NBR/Viton B-50. In all blends, FKM zone forms spherical drops of Viton GH phase regardless of the composition.
The adding effect of ethyleneacrylate elastomer as a dispersion agent was also examined to decrease the necessary minimum amounts of FKM (Viton B-50) in the blend materials. Concerning with the resistance to heat aging and sour gasoline, % elongation change and % tensile strength change at 40/50/10 volume ratio of NBR/FKM/Elastomer were almost same as those at 40/60 volume raltio of NBR/FKM without elastomer. However, concerning with gasohol resistance, volume swell of NBR/FKM/Elastomer blend was larger than that of NBR/FKM because of poor oil resistance of the elastomer.View full abstractDownload PDF (1448K) -
P. J. Corish, [in Japanese]1983 Volume 56 Issue 12 Pages 794-819
Published: 1983
Released on J-STAGE: July 09, 2007
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[in Japanese]1983 Volume 56 Issue 12 Pages 820-821
Published: 1983
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (274K)
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