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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Wet spinning of silk polymer - I. Effect of coagulation conditions on the morphological feature of filament
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Wet spinning of silk polymer - I. Effect of coagulation conditions on the morphological feature of filament

机译：丝绸聚合物的湿法纺丝-混凝条件对长丝形态特征的影响。

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Regenerated silk fibroin (SF) filaments were prepared by the wet spinning technique. The effect of coagulation conditions, such as coagulant type and coagulation temperature, was investigated on the morphological feature of SF filaments and a theoretical approach was also performed to understand the coagulation phenomena. SEM observation revealed that as the R group size of alcoholic coagulant (ROH) increased, the cross-sectional shape deviated more from a circular form. This is attributed to the fact that as the R group size increased, the mass transfer rate difference increased, but the coagulation rate decreased due to a reduced diffusion rate. Most non-alcoholic coagulants exhibited this circular cross-sectional shape, except dioxane, which showed a clover shape. As the coagulation bath temperature increased, the cross-section deviated less from a circular form, with the reduction of fiber diameter. When methanol/water mixture was used as a coagulant, an ellipse or a dog-bone shape was obtained with higher water content in methanol, which was attributed to the decrease of coagulation rate. Although methanol exhibited a positive value of mass transfer rate difference, a circular shape of cross-section was obtained due to the density difference of the coagulated and uncoagulated parts in the coagulating SF filament. (C) 2004 Elsevier B.V. All rights reserved.
机译：通过湿纺技术制备了再生的丝素蛋白（SF）丝。研究了凝固条件如凝固剂类型和凝固温度对SF长丝形态特征的影响，并通过理论方法了解了凝固现象。 SEM观察表明，随着醇类凝结剂（ROH）的R基团尺寸的增加，其横截面形状更偏离圆形。这归因于以下事实：随着R基团尺寸的增加，传质速率差异增大，但是由于扩散速率降低，凝结速率降低。除二恶烷外，大多数非酒精性混凝剂均显示出此圆形横截面形状，而二恶烷则显示出三叶草形状。随着凝固浴温度的升高，横截面偏离圆形的程度变小，纤维直径减小。当使用甲醇/水混合物作为凝结剂时，获得的椭圆形或狗骨头状具有较高的甲醇含量，这归因于凝结速率的降低。尽管甲醇显示出传质速率差的正值，但是由于凝结的SF丝中凝结部分和未凝结部分的密度差而获得了横截面为圆形的形状。 （C）2004 Elsevier B.V.保留所有权利。

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