MOLECULAR MOTION AND TRANSITIONS IN VARIOUS TYPES OF POLYAMIDES STUDIED BY THE FLUORESCENCE METHOD

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  • Seki Junji
    Textile Research and Development Laboratory, Asahi Chemical Industry Co. Ltd. Synthetic Resin Department, Technical Division, Asahi Chemical Industry Co., Ltd.

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  • Molecular motion and transitions various types of polyamides studies by the fluorescence method

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Abstract

Microbrownian motion in polyamide chains is studied by the fluorescence method. In the first place, the validity of the estimation of molecular motion is studied. The relaxation properties of fluorescent polyamide (diamino stilbene-conjugate or DAS-conjugate in contraction) are compared with those of the usual nylon-6 in which free fluorescent dye (auramine-O or diacetylamino stilbene) is dispersed. In the dilute solution they give different relaxation times and the apparent activation energies. However, in the concentrated solution and especially in solids, either sample gives almost the same relaxation time and apparent activation energy.<br>Then, in the next place, the molecular motion and the transition in various types of bulk polyamide are studied using auramine-O as a probe. Transition temperature varies almost linearly with CED of the material, and the extrapolation to polymethylene gives the limiting value much higher than the glass transition temperature of polyethylene. Apparent activation energy also depends on CED.<br>Other properties such as dynamic modulus and X-ray parameters are compared with the fluorescence parameter. The effects of water on the relaxtion properties is also studied.<br>The mechanism of the transition is discussed on the basis of these experimental studies.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 24 (12), 562-572, 1968

    The Society of Fiber Science and Technology, Japan

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