Spiders can produce different types of silks with different functions by tuning the hierarchical structure of spidroin. Inspired by the secondary structure of spider silk, a series of peptide-polyurethane/urea (PUU) hybrids with various peptide contents were synthesized in this work. By effective control of polymerization degree, simultaneous presence of α-helixes and β-sheets in the polymer was realized. The modulus of films increased with peptide loading and reached more than 200 MPa at 71.1% peptide content. Notably, the PUU hybrid with 41.5% peptide content (P-41.5) showed the highest tensile strength (6.6 MPa) and strain (1238%). At the same time, this film (P-41.5) exhibited shape memory effect at 37 °C, as well as excellent shape recovery ratio during successive cycles at 100% strain. Furthermore, Ag nanowires/P-41.5 hybrid film exhibited superb electric resistance stability under bending and stretching conditions, making it a promising material for strain sensors.

蜘蛛可以通过调整蛛丝蛋白的层次结构，生产出具有不同功能的不同种类的丝。受蜘蛛丝二级结构的启发，本工作合成了一系列具有不同肽含量的肽-聚氨酯/尿素（PUU）杂化物。通过有效控制聚合度，同时存在α-螺旋和β实现了聚合物中的片材。薄膜的模量随着肽负载的增加而增加，在肽含量为 71.1% 时达到 200 MPa 以上。值得注意的是，肽含量为 41.5% 的 PUU 杂化物 (P-41.5) 显示出最高的拉伸强度 (6.6 MPa) 和应变 (1238%)。同时，该薄膜 (P-41.5) 在 37 °C 下表现出形状记忆效应，并在 100% 应变下的连续循环中表现出优异的形状恢复率。此外，Ag纳米线/P-41.5混合薄膜在弯曲和拉伸条件下表现出极好的电阻稳定性，使其成为应变传感器的有前途的材料。