An effective and simple process for obtaining high strength silkworm (Bombyx mori) silk fiber |
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| Authors: | Xudong Fang Tom Wyatt Jianhua Wu Donggang Yao |
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| Institution: | 2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, 30318, USA
1. Wujiang Dingsheng Silk Co. Ltd., Shengze, Suzhou, 215228, China
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| Abstract: | This article describes a new process for strengthening natural silk fibers. This process is simple yet effective for mass production of high strength silk fibers, enabled by drawing at a lower temperature and immediately heat setting at a higher temperature. The processing conditions were investigated and optimized to improve the strength. Silk fibers drawn to the maximum ratio at room temperature and then heat set at 200 °C show best tensile properties. Some salient features of the resulting fibers are tensile strength at break reaching 533±10.2 MPa and Young’s modulus attaining 12.9±0.57 GPa. These values are significantly higher than those of natural silk fibers (tensile strength increased by 44 % and Young’s modulus by 135 %). Wide-angle X-ray diffraction and FTIR confirm the transformation of silk I to silk II crystalline structure for the fiber obtained from this process. DSC and TGA data also provide support for the structural change of the silk fiber. |
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