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Volume 58, Issue 11
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1985 Volume 58 Issue 11 Pages 689-697
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese], [in Japanese]1985 Volume 58 Issue 11 Pages 698-705
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese]1985 Volume 58 Issue 11 Pages 706-712
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese]1985 Volume 58 Issue 11 Pages 713-720
Published: 1985
Released on J-STAGE: April 16, 2008
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[in Japanese]1985 Volume 58 Issue 11 Pages 720
Published: 1985
Released on J-STAGE: April 16, 2008
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The Distribution of Ingredients in Elastomer Component for Short Fiber-Elastomer CompositesToru NOGUCHI, Michio ASHIDA, Satoshi MASHIMO1985 Volume 58 Issue 11 Pages 721-727
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe distribution of ingredients, zinc, magnesium, sulfur, and chlorine, in elastomer component was examined by using EMX for nylon-CR, PET-CR, and PET-EPDM composites, in which short fibers were treated by RFL system. In the case of nylon-CR and PET-CR composites, zinc and magnesium aggregated in matrix layer of 10μm from the interface between fibers and matrix. For PET-EPDM composite, sulfur aggregated at the interface between fibers and matrix as well as near the surface. In the case of CR-RFL laminate sample as a typical model, aggregations of zinc and magnesium were observed in CR layer of 10μm from the RFL, while in EPDM-RFL laminate sample, sulfur aggregated at the interface of the laminate. After the PET-EPDM composite was swollen with benzene, the aggregation of sulfur dispersed in the matrix. These results indicated that free sulfur in EPDM matrix migrated to the interface of the different layer. The metal oxides loaded in CR compound reacted with chlorine of CR to their respective chlorides in mixing and curing procedures. Because these metal chlorides are readily soluble in water, they might be drawn to RFL layer owing to its occlusion water. When the composite absorbed water and then dried, aggregations of zinc and magnesium in the vicinity of the interface dispersed in the matrix for PET-CR composite, while the aggregation of these metals kept their concentration for nylon-CR composite. The results suggested that nylon fiber absorbed water stronger than PET fiber so that the metal chlorides remained at the interface of nylon fiber after water treatment. These metal chlorides and sulfur migrated from elastomer into RFL film in curing procedure. It seems that RFL layer cross-links with elastomer by zinc and sulfur, and give rise to strong adhesion between fibers and elastomer.View full abstractDownload PDF (500K) -
Relations Between Polymerization Factors and Vulcanized Properties of Dicyclopentadiene Type Medium Mooney EPDMTaiji MIYAKE, Morio TAKEYAMA, Fumikazu YAMAGATA, Hidekuni ODA1985 Volume 58 Issue 11 Pages 728-736
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDicyclopentadiene type EPDM was synthesized from ethylene, propylene and dicyclopentadiene using soluble Ziegler catalyst consisting of hydrocarbon soluble vanadium compounds and organic aluminum compounds, by a continuous polymerization process under normal pressure. In this study, we examined the relation between polymerization factors and main physical properties of vulcanized EPDM.
On decreasing the polymerization temperature, the roll processability of raw EPDM and the tackiness of compounds decreased respectively. On vulcanizing the rubber, its crack resistance was improved.
When the ethylene content of EPDM was increased to a level higher than 60%, its tackiness, crack resistance and elongation at break were improved accordingly.
The content of dicyclopentadiene was found to be the most effective factor influencing the vulcanized rubber properties. By increasing the dicyclopentadiene content, the scorch time, crack resistance and heat build-up, elongation, rebound, and compression set were all improved. On the other hand, the tensile modulus, tensile strength and hardness values became lower.
From the forgoing results, it has been found that the crosslinking density of EPDM has a significant effect on the EPDM rubber properties.View full abstractDownload PDF (691K) -
Relations Between Polymerization Factors and Vulcanized Properties of Dicyclopentadiene Type EPDM with 50 Parts oil ExtendedTaiji MIYAKE, Morio TAKEYAMA, Fumikazu YAMAGATA, Masanori ARITOMI1985 Volume 58 Issue 11 Pages 737-745
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSUsing soluble Ziegler catalyst consisting of vanadium compounds and aluminum compounds, dicyclopentadiene type EPDM was synthesized from polymerization of ethylene, propylene and dicyclopentadiene by a continuous polymerization process under normal pressure. In this study, we synthesized high Mooney EPDM suitable for making 50 parts oil extended rubber. In order to obtain ML1+4 (100°C) 50-90 after oil extention, it was found necessary to synthesize super high ML EPDM raw rubber of which ML is higher than 150-200 or more in term of ML-viscosity.
The relation between polymerization conditions and main physical properties of vulcanized EPDM were also investigated. To obtain high moleculer weight EPDM, it was found that the amount of vanadium compounds used and the ethylene content of EPDM have significant effects. With a lower amount of the vanadium catalyst, 50% oil extended EPDM products were synthesized respectively varying in diene content, ethylene content and ML. Investigation after vulcanization of the EPDM products, revealed that their dynamic properties lower as the diene residue content increases and both elongation and flex times lower as the ethylene content increase. However, MLs showed no significant effect on the physical properties of vulcanized EPDM, when it exceeds a certain level.View full abstractDownload PDF (657K) -
1985 Volume 58 Issue 11 Pages 750-751
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (218K)
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