NIPPON GOMU KYOKAISHI

[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 201-206
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_201

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[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 207-213
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_207

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[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 214-217
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_214

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[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 218-223
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_218

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[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 224-226
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_224

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[title in Japanese]

[in Japanese]

1979 Volume 52 Issue 4 Pages 227-234
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_227

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Rubber Powder

1979 Volume 52 Issue 4 Pages 235-236
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_235

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Testing Methods for Synthetic Rubber IIR

1979 Volume 52 Issue 4 Pages 237-239
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_237

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CO-CROSSLINKING OF PVC AND CR

Yoshiro NAKAMURA, Kunio MORI, Rikiya TAKESAWA

1979 Volume 52 Issue 4 Pages 240-246
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_240

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Co-crosslinking between PVC and CR has been accomplished by the following procedure. A 10 g mixture of PVC, CR (PVC/CR: 75/25, 50/50, and 25/75) and 2 parts of metal stearates were blended on a 2-inch roll at 170°C for 7 min. Lowering the temperature to 60-90°C and adding 3 parts of 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol, 1-2.5 parts of N-cyclohexylthiophthalimide and 5 parts of MgO, the mixture was further blended for 5 min. The resulting blends were then press-cured for 20 min at 170°C. The crosslinking degree of PVC and CR which are the components in the co-crosslinked product is approximately equal.
The formation of chemical bond between PVC and CR is also realized. The mechanical properties (T_B, E_B) and thermal properties of the crosslinked product are superior tothose of the uncrosslinked controls and the crosslinked product with NA-22 which is reactive only to CR.

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MECHANOCHEMICAL REACTION OF POLYMERS BY ULTRASONIC IRRADIATION.(IV)

MECHANOCHEMICAL COPOLYMERIZATION IN MIXTURES OF POLYBUTADIENE-STYRENE AND METHYL METHACRYLATE BY ULTRASONIC IRRADIATION

Hideki FUJIWARA, Katsuhiro SASAKI, Koichi HOCHI, Kunio GOTO

1979 Volume 52 Issue 4 Pages 247-255
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_247

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Mechanochemical block copolymerization in polybutadiene-styrene and methyl methacrylate mixtures has been studied by ultrasonic irradiation at 60°C. The results obtained were as follows:(1) Mechanical degradation of the polymer chain in the system polybutadiene-methyl methacrylate occurred rapidly and vigorously rather than that of polybutadien-estyrene mixtures. The rate constants k_d for mechanical degradation were 2.54×10^-7sec^-1 in the former system and 0.81×10^-7sec^-1 in the latter.(2) In both systems, the initial rate of mechano-chemical copolymerization R_p decreased with increasing the initial concentration of polybutadiene.R_p in the system polybutadiene-methyl methacrylate was much faster than that of polybutadiene-styrene mixtures and R_p was given by: R_p∝[S_t].(3) The polymerization catalyst and that fragments which were contained within the original polybutadiene were deposited by the action of ultrasonic waves.(4) The formation of mechanochemical block copolymers and its proportion were confirmed and the apparent degree of blocking D_b was approximately 42%. In addition, it was observed that even if the compatibility of the different polymers was bad, its compatibility was improved by the addition of both block copolymers.

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RECLAMATION OF VULCANIZED RUBBER BY CHEMICAL DEGRADATION (X)

RECLAMATION OF SYNTHETIC RUBBER VULCANIZATES BY THE COPPER (I) CHLORIDE-TRIBUTYLAMINE SYSTEM

Nariyoshi KAWABATA, Shinzo YAMASHITA

1979 Volume 52 Issue 4 Pages 256-261
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_256

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The copper (I) chloride-tributylamine system was found to be effective at room temperature for the reclamation of the following gum vulcanizates: sulfur vulcanizates of synthetic isoprene rubber (IR), styrenebutadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), ethylene-propylene terpolymer (EPDM), and butyl rubber (IIR); SBR vulcanized by tetramethylthiuram disulfide and zinc oxide; chloroprene rubber (CR) vulcanized with 2-mercaptoimidazoline; and organic peroxide vulcanizates of SBR and CR. Reclamation of organic peroxide vulcanizate of EPDM by the catalyst system was rather difficult.

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[title in Japanese]

1979 Volume 52 Issue 4 Pages 262-263
Published: April 15, 1979
Released on J-STAGE: March 05, 2013

DOIhttps://doi.org/10.2324/gomu.52.4_262

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