毛发纤维水响应形状记忆性能的探索

Shape Memory Effect of Hair Fibers Responsive to Water

采用4种典型毛发纤维(山羊毛、绵羊毛、骆驼毛和人发)进行水响应形状记忆的性能研究。结果表明,该类纤维在水的刺激下呈现出较高的临时形状固定能力(>90%)和变形回复能力(>60%)。XRD和拉曼光谱表征显示,结构饱满的毛发由于双节点结构(结晶和二硫键)表现出较强的形状记忆能力;结晶为单节点毛发的水响应形状记忆能力强于二硫键为节点的毛发;红外光谱显示,毛发纤维中的氢键为水响应形状记忆的开关单元,氢键的含量决定了毛发临时形状的固定能力。

Hair fibers are traditionally viewed as good textile materials because of their outstanding elasticity and warmth retention. Recently, It was reported that these natural fibers are a set of smart polymers that can be responsive to many stimuli. In this article, four typical hair fibers including human hair, goat, sheep and camel fibers, were investigated for their shape memory effect （ SME） induced by water. It was found that these fibers had good shape memory abilities, which shows more than 90% of shape fixation and 60% of shape recovery ratios. Characterization by X-ray diffraction and Raman spectra indicated that fibers which have twin net-points structure has good SME. The twin net-points are formed due to crystals and disulfide bonds （DBs）. The SME of fiber which has single net-point was better than the one with DBs. The switches in SME of four hair fibers were characterized using Fourier Transform Infrared Spectroscopy. It was found that these four fibers have identical switch unit, which is hydrogen bond. It was also found that the amount of hydrogen bonds determine the temporary shape fixation ability of hair fibers.