Freezing and melting behabiors of wholly aromatic, aliphatic and alicyclic polyamides.

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  • Konomi Tsuyoshi
    Department of Clothing, Faculty of Home Economics, Japan Women's University
  • Yamamoto Yukiko
    Department of Clothing, Faculty of Home Economics, Japan Women's University Department of Material Engineering, Kanazawa Institute of Science and Technology

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Other Title
  • 全芳香族，脂肪族および脂環族ポリアミドの吸着水の凍結・融解挙動
  • ゼン ホウコウゾク シボウゾク オヨビ シカンゾク ポリアミド ノ キュウチャ

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Description

The freezing (crystallization) and melting behaviors of the water adsorbed on wholly aromatic polyamides (aramids) were studied by DSC in comparison with that of aliphatic and alicyclic polymers and the mobility of the adsorbed water on aramids was discussed. The crystallization peaks of the bound freezing water in DSC thermograms for Nomex and Kevlar 29 were found for samples with lower water contents and at higher temperature than for aliphatic and alicyclic polymers. Two crystallization peaks, due to free and bound water molecules, of the aramides merged gradually into a single peak at a higher temperature when the amount of the free water was increased. The water molecules adsorbed on aramids seem to behave as more loosely bound molecules than those on aliphatic polyamides. The molar amounts of non-freezing water on aramids and aliphatic and alicyclic polyamides were all nearly equal to the molar amounts of amide groups in their amorphous region. The total molar amounts of non-freezing and bound freezing water molecules on aramids and aliphatic polyamides were estimated as 2.3-2.8 times those of the amide group in the amorphous region.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 46 (10), 433-440, 1990

    The Society of Fiber Science and Technology, Japan

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