摘要
在制备高浓度高分子量蚕丝素蛋白水溶液的基础上,采用湿法纺丝技术,在一定条件下纺制出力学性能优于天然蚕(茧)丝的再生蚕丝纤维,其断裂强度及断裂伸长率分别达到0·5GPa和20%.扫描电镜观察结果显示:初生纤维具有典型的“皮芯”结构,而纤维内部则为疏松多孔的网状或蜂窝状结构;经过一定的后拉伸处理后,纤维的表面变得光滑,且内部结构也趋于致密.固体13C核磁共振及拉曼光谱分析结果表明,后拉伸及热湿处理均有利于提高纤维内部β-折叠结构的含量,分子链的规整度和取向性也随之改善,从而使再生蚕丝纤维的力学性能得到进一步提高.
Regenerated silk fibroin fibers with remarkable mechanical properties were successfully prepared via wet spinning technique, based on the high concentration and high molecular weight silk fibroin aqueous so-lution as spinning dope. With the observation of SEM, it could be found that the cellular structure may exist in the core of as-spun fibers. The regenerated silk fibers exhibited a smooth surface and dense structure after the post-drawn process. The NMR and Raman spectra results reveal that the β-sheet content increased with the in-crease of drawn ratios. It was also found that the steam-annealing can further improve the orientation of the macromolecular chains in the fibers. After the post treatment （both post-drawn and steam annealing）, the breaking strength better than that o and the elongation at break can reach 0. 5 GPa and 22%, separately, which is close or even f natural silk （cocoon） fibers.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第6期1181-1185,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金重点项目(批准号:20434010)
国家杰出青年科学基金(批准号:20525414)资助
关键词
丝素蛋白
人工纺丝
后拉伸
构象
力学性能
Silk fibroin
Artificial spinning
Post-drawn
Conformation
Mechanical property
