Possibility of Mixing Level Estimation Using Dielectric Constant.

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Other Title
  • 誘電率を用いた混練度判定の可能性
  • ユウデンリツ オ モチイタ コンレンド ハンテイ ノ カノウセイ

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Abstract

The relation between mixing times and dielectric constants of rubber compounds is investigated as a step of the series studies on compound properties vs. mixing. Using an impedance analyser, capacitances are measured with appreciable reproducibility for the compound sheets by a Brabender Plastgraph and a press where the same recipe materials as used in our study of the EPR-processability indices are mixed and pressed. When plotted against mixing times with semilogarithmic expression, the curves of the dielectric constants calculated by the capacitances shows such bending points as in the case of electrical conductivities reported somewhere, whreas the constants at 30s are 2-3 times larger than those at 10min, and steeper decreases until the minimum compounding times are characteristic to the curves in cooperation with the milder changes after the times. It suggests suitability ofthe dielectric measurement for mixing level estimation. The theoretical backborn is not clear. It might be noted that the similar phenomenon are known in W/O emulsions.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 68 (3), 193-196, 1995

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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