日本ゴム協会誌
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85 巻, 11 号
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総説
  • 磁場勾配高速マジック角回転固体NMR法による加硫天然ゴムの架橋点の構造解析
    河原 成元
    2012 年 85 巻 11 号 p. 347-353
    発行日: 2012年
    公開日: 2013/08/02
    DOIhttps://doi.org/10.2324/gomu.85.347
    ジャーナル フリー
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    Field gradient-fast-magic angle spinning (FG-FMAS) probe, developed for solid-state NMR spectroscopy, was applied to investigate crosslinking junctions of vulcanized natural rubber. Resolution of 1H- and 13C-NMR spectra and correlation between 1H and 13C of the vulcanized natural rubber were investigated by one- and two-dimensional measurements. Signals, appearing between 40 and 60 ppm, were well assigned by FG-FMAS solid state NMR spectroscopy; for instance, signal at 40 ppm was assigned to C1 of trans-1,4-isoprene units, signals at 44 ppm was to secondary carbons adjacent to carbons linking to S atom and signals at 58 ppm were to tertiary and quaternary carbons linking to S atoms. Based on the assignments of the signals, origin of outstanding mechanical properties of the vulcanized natural rubber was related to the structure of crosslinking junctions.
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報告
  • 加工性を左右する未加硫ゴムの流動挙動
    －主として押出加工性に関する考察－
    西澤 仁
    2012 年 85 巻 11 号 p. 361-367
    発行日: 2012年
    公開日: 2013/08/02
    DOIhttps://doi.org/10.2324/gomu.85.361
    ジャーナル フリー
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    Most important way to analyze processability of unvulcanized compounds in practical process is to evaluate the flow behaviors of the rubber compounds, and to estimate the processability indexes, such as viscosity, pressure loss, relaxation coefficient and others. In this report, I would like to describe the flow behaviors in practical extrusion processes and the relations between these flow behaviors and processability indexes. Furthermore, the trouble occurred in extrusion processes and the countermeasures to solve these troubles will be discussed on the standpoint of these processability indexes and other flow characteristics of unvulcanized compounds.
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