絹フィブロインのDSC曲線

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タイトル別名
  • DSC THERMOGRAMS OF SILK FIBROIN
  • キヌ フィブロイン ノ DSC キョクセン

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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.

収録刊行物

  • 繊維学会誌

    繊維学会誌 28 (4-5), 91-98, 1972

    社団法人 繊維学会

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