As an ideal smart wearable natural material, α-keratin type mammalian hairs have proved to exhibit multiple-responsive shape memory effects under water, wet, xenon and redox stimuli, in which the inherent disulfide bonds played the roles of either netpoints or switching units. Accordingly, here in this work, we proposed to increase the content of disulfide bonds of representative mammalian hairs - wool fibers, which are widely used in daily life, by means of three chemical methods so as to improve their multiple-responsive shape memory effects. On the basis of systematic researches, it was found that the treatment with cystamine gave the highest efficiency of introducing disulfide bonds due to full use of the free functional groups of wool, while the valuable crystalline phases of wool were nearly not affected. As a result, the cystamine modified wool fibers possessed greater shape recovery ratio under water and heat conditions, and larger shape fixation ratio under xenon and redox conditions, in comparison with the untreated version. The mechanisms involved were carefully analyzed. The application scope of the on-demand programmed wool in intelligent fabrics and textiles would thus be broadened.

作为一种理想的智能可穿戴天然材料，事实证明，α-角蛋白类型的哺乳动物毛发在水，湿，氙和氧化还原刺激下均表现出多重响应的形状记忆效应，其中固有的二硫键起着净点或转换单元的作用。因此，在此工作中，我们提议通过三种化学方法来增加在日常生活中广泛使用的代表性哺乳动物毛发-羊毛纤维中二硫键的含量，以改善其多重反应的形状记忆效应。在系统研究的基础上，发现由于充分利用了羊毛的游离官能团，用胱胺处理使引入二硫键的效率最高，而羊毛的有价值的结晶相几乎没有受到影响。因此，与未经处理的相比，胱胺改性的羊毛纤维在水和热条件下具有更大的形状恢复率，在氙气和氧化还原条件下具有更大的形状固定率。仔细分析了涉及的机制。因此将扩大按需编程羊毛在智能织物和纺织品中的应用范围。