基于构象和细胞形态变化的牦牛毛拉伸细化机理

Mechanism research of yak hair stretching slenderization based on the changes of conformation and cell shape

利用拉曼光谱技术对拉伸过程中牦牛毛纤维大分子构象的变化进行研究。结果表明,拉伸过程中牦牛毛纤维大分子始终发生α螺旋构象向β折叠构象的转变,同时在纤维大分子间还存在微结构滑移,且这一过程主要发生于拉伸过程的中后期。借助超声分离技术,对细化前后牦牛纤维皮质细胞形态的变化进行分析,发现纤维皮质细胞被拉长变细且不发生细胞间的滑移。基于研究结果确定,当拉伸倍数较大时,牦牛毛纤维的主拉伸机制为"部分大分子滑移"理论。

The macromolecular conformational changes of yak hair fiber have been investigated during stretching by Raman. The result showed that the transformation of macromolecular conformation was always taken place in yak hair fiber during stretching. Meanwhile, the slippage between macromolecule also exists in yak hair fibers, and which mainly take place in middle and later periods of slenderization. The shape changes of cortical cell of yak hair fiber have been analyzed before and after stretching slenderization by means of ultrasonic separation. On the basis of the investigation results, the main stretching mechanism of yak hair fiber has been confirmed. That is ＂Partial Slippage of Macromolecule＂, when the stretching ratio is comparatively large.