Suitability of free energy slope theory in the blooming of stearamide.

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  • MORI Kunio
    Department of Applied Chemistry & Molecular Science, Faculty of Engineering, Iwate University
  • SHIMIZU Kenji
    Department of Applied Chemistry & Molecular Science, Faculty of Engineering, Iwate University
  • OKOSHI Masayuki
    Department of Applied Chemistry & Molecular Science, Faculty of Engineering, Iwate University
  • MATSUNAMI Shoichi
    Nippon Kasei Co. Ltd, Institute of Research & Development

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Other Title
  • 脂肪酸アミドのブルーム挙動に関する研究　（第３報）　　ステアリン酸アミドのブルームにおける自由エネルギー勾配論の適合性
  • ステアリンサン アミド ノ ブルーム ニ オケル ジユウ エネルギー コウバイ

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Suitability of the free energy slope theory in the blooming of stearamide (SA) from NBR samples have been investigated for three important factors such as concentration, the pressure to SA particles (elastic modulus in NBR samples) and abusolute temperature (T). In this theory, a parabolic law must applies between those factors and blooming rate. The parabolic law did not apply between blooming rate and concentration factors such as the amount of SA particles condensed, the diffusion coefficient of SA, the solubility of SA and the volume fraction of SA in NBR samples. This shows that the concentration factors do not suited the free energy slope theory at all. The external and internal pressure to SA particles in NBR samples was given by two different methods, the elongation of samples and the change of crosslinking density. The former did not suit at all to this theory because the blooming rate decreased with the elongation ratios. The latter was concluded not to suit to this theory as a whole though the parabolic law apply partially in the relation between crosslinking density and blooming rate. In the relation between the blooming rate and 1/T, the parabolic law was not applied at all. The activation energies in the blooming of SA from NBR samples were 46.6kJ mol-1 for 18%AN-NBR and 48.3kJ mol-1 for 18%AN-NBR. From above results, the blooming of SA was concluded not to suit the free energy slope theory.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 71 (3), 173-179, 1998

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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