不溶性イオウの熱転移機構に関する考察

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タイトル別名
  • STUDY OF TRANSITION MECHANISM OF CARBON DISULFIDE-INSOLUBLE SULFUR
  • フヨウセイ イオウ ノ ネツ テンイ キコウ ニ カンスル コウサツ

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Heat transition phenomena of carbon disulfide-insoluble sulfur to soluble one were studied on some commercial samples (for example, Crystex, Monsanto 60 and some domestic samples). A hypothesis was proposed to interpret the observed characteristic phenomena, Insoluble sulfur consists of various molecular forms, such as S1, S2, S3, etc. These forms change stepwise under the influence of heat until the final transition into soluble sulfur S0 is accomplished. S1→a1S2→a2S3→a3…→anS0.<br>Heat transition of insoluble sulfur at each stage is shown by the following equations, <br>-dSn/dt=anSn, a1<a2<a3<…<an<br>where an is the rate constant of transition. Then the differences of heat stability of commercial insoluble sulfurs are due to the fact that they contain various transitional forms in various proportions. The relationship between temperature and an obeys the Arrhenius equation. The values of their activation energy are equally calculated to be about 80kcal/mol in a range of 85-95°C. However, this value is far greater than the activation energy of 35kcal/mol of S-8 ring fracture obtained from the vulcanization reaction of N. R. without accelerators at 130-160°C. by Scheele or Ludwig. Presence of small amounts of some stabilizers in the insoluble sulfur, is suspected of increasing the activation energy of their heat transition. But this must be further investigated.

収録刊行物

  • 日本ゴム協会誌

    日本ゴム協会誌 35 (9), 674-684, 1962

    一般社団法人 日本ゴム協会

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