NIPPON GOMU KYOKAISHI

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Volume 76, Issue 3

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Determination of Crosslink Density in Vulcanized Rubber Forms by NMR

Masayoshi ITO, Kayoko KANESHIMA, Junichi SAWANOBORI, Hiroshi HORI

2003 Volume 76 Issue 3 Pages 81-85
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.81

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An examination was carried out on the determination of crosslink density in the vulcanized rubber forms by pulsed NMR. The rubber used was an ethylene-propylene-diene rubber (EPDM). The crosslinked EPDM was obtained by curing EPDM with sulfur vulcanization. The vulcanized EPDM forms were produced by using several kinds of forming agents. The crosslink density of non-cellular EPDM determined by equilibrium swelling and extensional experiments was well correlated with the spin-spin relaxation time (T₂) at high temperatures around 120°C. Further, the T₂ of vulcanized EPDM forms was not affected by the existence of cellular structure. The results made it possible to determine the crosslink density in the vulcanized EPDM forms by NMR method. By using the technique, it was possible to evaluate the cure efficiency of vulcanized EPDM forms which was affected by forming agents.

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2003 Volume 76 Issue 3 Pages 86-89
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.86

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2003 Volume 76 Issue 3 Pages 90-92
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.90

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2003 Volume 76 Issue 3 Pages 93-95
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.93

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2003 Volume 76 Issue 3 Pages 96-100
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.96

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[title in Japanese]

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2003 Volume 76 Issue 3 Pages 101-104
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.101

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2003 Volume 76 Issue 3 Pages 105-111
Published: 2003
Released on J-STAGE: May 28, 2007

DOIhttps://doi.org/10.2324/gomu.76.105

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