DSC THERMOGRAMS OF SILK FIBROIN

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  • Ishikawa H.
    Faculty of Textile Science and Technology, Shinshu University
  • Tsukada M.
    Faculty of Textile Science and Technology, Shinshu University
  • Toizume I.
    Faculty of Textile Science and Technology, Shinshu University
  • Konda A.
    Faculty of Textile Science and Technology, Shinshu University
  • Hirabayashi K.
    Faculty of Textile Science and Technology, Shinshu University

Bibliographic Information

Other Title
  • 絹フィブロインのDSC曲線
  • キヌ フィブロイン ノ DSC キョクセン

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Abstract

The following results were obtained from investigation of DSC thermograms of silk fibroin.<br>1. The decomposition temperature of the crystalline region of silk fibroin is estimated to be about 348°C from the DSC thermograms of the hydrolysis residue.<br>2. Silk fibroin is changed thermally into unoriented β-type by the treatment with CaCl2 solution in a free state, while the decomposition temperature of the samples treated at constant length becomes higher than the original samples.<br>3. The α-β transition of coagulated fibroin takes place at about 240_??_250°C, and the resulting β-type fibroin is decomposed at about 290_??_300°C. When the α-β transition is caused by swelling or heat-treatment, the coagulated fibroin is changed into β-type through the mixture of α and β type depending on the treating conditions.<br>4. α-type fibroin is easely changed into β-type by drawing in a swollen state. This β-type fibroin shows a characteristic double peak due to decomposition; the main peak observed at a higher temperature in the thermogram is shifted to higher temperature by drawing, while the other is unchanged.<br>5. DSC thermograms of fibroin powdered by grinding with a file have two endothermic peaks; one occurs at about 185°C and the other at abou 295°C. The former disappears and the latter shifts slightly to higher temperature by recrystalizing in the presence of water.<br>6. It is concluded that DSC thermograms of silk fibroin are divided into two components which are attributed to unoriented β-type component and oriented β′-type one, respectively.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 28 (4-5), 91-98, 1972

    The Society of Fiber Science and Technology, Japan

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