伸長による天然ゴムの不均質構造の変化 Inhomogeneous Structure in Natural Rubber Vulcanizate under Deformation

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Inhomogeneous structure in natural rubber (NR) vulcanizate was examined by <sup>1</sup>H pulsed NMR. The spin-spin relaxation times (<i>T</i><sub>2</sub>) under various extension ratios (α) were measured by the Hahn echo method and the solid echo method. The decay curves of NRs were resolved into three <i>T</i><sub>2</sub> components, <i>T</i><sub>2SS</sub>, <i>T</i><sub>2HS</sub>, and <i>T</i><sub>2HL</sub>, which were respectively arising from the strain-induced crystalline chains, the network chains, and the more mobile chains that were less affected by crosslinks or entanglements. <i>T</i><sub>2HS</sub> and <i>T</i><sub>2HL</sub> decreased with increasing α. However, <i>T</i><sub>2HL</sub> leveled off at α beyond 4 while <i>T</i><sub>2HS</sub> kept decrease. The decrease in <i>T</i><sub>2HL</sub> with α was more rapid than that of <i>T</i><sub>2HS</sub> until <i>T</i><sub>2HL</sub> became constant. This indicates that the deformation of the more mobile chains was larger than that of the network chains. The increase in the fraction of <i>T</i><sub>2SS</sub> component with increasing α was observed in the region of α that <i>T</i><sub>2HL</sub> were almost unchanged. It was suggested that the strain-induced crystallization is closely related with the more mobile chains.

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  • 日本ゴム協會誌  

    日本ゴム協會誌 80(3), 83-85, 2007-03-15 

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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各種コード

  • NII論文ID(NAID)
    10018295375
  • NII書誌ID(NCID)
    AN00189720
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    0029022X
  • NDL 記事登録ID
    8742941
  • NDL 雑誌分類
    ZP17(科学技術--化学・化学工業--高分子化学・高分子化学工業--ゴム・プラスチックス)
  • NDL 請求記号
    Z17-125
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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