NIPPON GOMU KYOKAISHI

STUDIES ON THE BLEND OF RUBBER LIKE MATERIALS AND THERMOPLASTIC RESINS I.

COPOLYMERS AND BLENDS IN THE BUTADIENE-STYRENE SYSTEMS

M. Imoto, Y. Minoura, K. Goto, A. Yabe, M. Takimiya, I. Ando, Y. Imaku ...

1965Volume 38Issue 2 Pages 81-91
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.81

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In comparision with butadiene-styrene copolymers and polybutadiene (rubber like) -polystyrene (resin like) blends, the properties of heterogeneous polymer system were studied.
It was found that the copolymer series differed essentially from blended polymer series in their behaviors, independent of blending method (by roll milling and blending in latex form) and curing system (sulfur-cure, peroxide cure and radiation-cure). That is the properties of blended polymer series were in linear relation to styrene content, but in the copolymer series the properties were in non-linear relation.

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STUDIES ON SYNTHETIC RUBBER PROCESSING (I)

THE EFFECTS OF RAW MOONEY VISCOSITIES OF SBR POLYMERS ON PHYSICAL PROPERTIES OF THEIR VULCANIZATES

J. Furukawa, S. Yamashita, S. Kimura, M. Umeno, Y. Minoshima, M. Kiumi ...

1965Volume 38Issue 2 Pages 92-97
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.92

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In order to investigate the correlation of physical characteristics between raw and cured SBR polymers, effects of Mooney viscosity in raw SBR on physical properties of it the vulcanizates were studied.
Experimental results obtained were as follows :
1) The values such as the Mooney viscocities and mill shrinkages in uncured SBR stocks increased linearly with the Mooney viscosities of raw polymers. In this case, mill shrinkages were not influenced with the viscosities only, but also with the types of raw polymers used.
2) When raw polymer having the higher value of Mooney viscosity was blended with lower one, the characteristics such as scorch time, tackiness, modulus, parmanent set, and compression set obtained were influenced by blending ratio.

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STUDIES ON SYUTHETIC RUBBER PROCESSING (II)

THE EFFECT OF SBR GEL ON PROCESSING AND PHYSICAL PROPERTIES OF THE UNVULCANIZATES AND THE VULCANIZATES. (I)

J. Furukawa, S. Yamashita, M. Morioka, S. Yamanaka, M. Minoshima, M. U ...

1965Volume 38Issue 2 Pages 98-102
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.98

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Using a roll mill having 14 inches in diameter, SBR 1502 was masticated for twenty minutes respectively at 40, 70, 100, 130 and 150°C of roll temperature. The forming conditions of the SBR gel were determined, and the effects of the gel formed on both the unvulcanizate and vulcanizate were studied.
It was formed that SBR gel was formed a little in the masticated rubbers under the condition of the roll temperature being lower than 100°C, and the physical properties of the uncured and cured rubber were nearly the same among those rubbers. The rubber which were masticated at 130°C and 150°C of roll temperature showed to contain a great quantity of polymer gel, and their physical properties of the vulcanizates were inferior to compared with those of the vulcanizates which masticated below 100°C of roll temperature.

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STUDIES ON SYNTHETIC RUBBER PROCESSING (III)

THE EFFECTS OF SBR GEL ON PROPERTIES AND PHYSICAL PROPERTIES OF THE UN-VULCANIZATES AND VAUCANIZATES (II)

J. Furukawa, S. Yamashita, T. Nagafune, M. Tsukasa, Y. Minoshima, M. U ...

1965Volume 38Issue 2 Pages 102-109
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.102

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We studied the effects on the properties of processing and vulcanizates of SBR gel which was formed in mastication and the mixing at high temperature. The previous paper reported the much amount of gel content, but this paper showed in the case of small gel amount. Using JSR 1502 as raw polymer, we varied the roll temperature of mastication and filler mixing at 40, 70, 90, 120 and 150°C respectively. The gel content obtained were measured 0.30-0.66% as polymer gel and 14-20% as filler-polymer gel.
The following results were found :
These SBR gel were formed in the roll processing, even if small amount, gave severe influence on Mooney viscosity, mill shrinkage, tackiness of unvulcanizates and increased modulus of vulcanizates, reduced the crack-resistance and swelling in toluene substantially.

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[title in Japanese]

[in Japanese]

1965Volume 38Issue 2 Pages 110-121
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.110

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[title in Japanese]

[in Japanese]

1965Volume 38Issue 2 Pages 122-137
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.122

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[title in Japanese]

1965Volume 38Issue 2 Pages 138-139
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.138

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[title in Japanese]

1965Volume 38Issue 2 Pages 140-141
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.140

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[title in Japanese]

1965Volume 38Issue 2 Pages 142
Published: February 15, 1965
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.2324/gomu.38.142

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