Departamento de Ciencia de Materiales, ETSI Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Biomacromolecules. 2010 May 10;11(5):1174-9. doi: 10.1021/bm901285c.
The development of a reliable procedure for removing the viscous coating of viscid silk has allowed the accurate characterization of the tensile behavior of clean flagelliform silk (i.e., silk of the flagelliform gland without the viscous coating synthetised in the aggregate gland). For comparison, tensile tests on native viscid silk (with the viscous coating) fibers were also performed. It was found that viscid silk, either native or clean, has an elastomeric behavior when kept wet, either by immersion in water (clean fibers) or by the effect of the viscid coating (native fibers). When tested in dry environments (35% RH, relative humidity, for clean fibers and 10% RH for native fibers), their mechanical behavior was no longer elastomeric, with it being more similar to other silk fibers. Furthermore, it was noticed that flagelliform silk fibers show a ground state to which they can return independent of the previous loading history.
一种可靠的去除粘性丝粘性涂层的方法已经被开发出来，这使得对清洁的鞭状丝（即来自于缨状腺的没有粘性涂层的丝）的拉伸性能的准确描述成为可能。为了进行比较，也对天然粘性丝（带有粘性涂层）纤维进行了拉伸测试。结果发现，无论是天然的还是清洁的粘性丝，在保持湿润时都具有弹性体行为，无论是通过浸泡在水中（清洁纤维）还是通过粘性涂层的作用（天然纤维）。当在干燥环境下（清洁纤维的相对湿度为 35%，而天然纤维为 10%）进行测试时，它们的机械行为不再具有弹性体特性，更类似于其他类型的丝纤维。此外，还注意到，鞭状丝纤维显示出一种基础状态，它们可以独立于先前的加载历史恢复到这种基础状态。
