双自组装瞬态网络中裂纹尖端的重排区
Rearrangement zone around a crack tip in a double self-assembled transient network
摘要：
研究了由遥爪聚合物可逆连接的表面活性剂胶束组成的自组装粘弹性流体中裂纹的成核和扩展。胶束的形态可以连续调节，从球形到棒状到蠕虫状，从而当胶束足够长且缠结时产生瞬时双网络，否则产生瞬时单网络。对于一个单一的网络，我们表明，裂纹形核时，涉及的样品变形率是可比的网络的弛豫时间尺度。相比之下，对于双网络，当裂纹成核和传播时，胶束发生显著的重排。我们发现，双折射发展在裂纹尖端超过一个有限的长度，$ξ$，这对应于胶束对齐发生的长度尺度。我们发现，$ξ$是更大的较慢的裂纹，这表明增加的延展性。
英文摘要：
We investigate the nucleation and propagation of cracks in self-assembled viscoelastic fluids, which are made of surfactant micelles reversibly linked by telechelic polymers. The morphology of the micelles can be continuously tuned, from spherical to rod-like to wormlike, thus producing transient double networks when the micelles are sufficiently long and entangled, and transient single networks otherwise. For a single network, we show that cracks nucleate when the sample deformation rate involved is comparable to the relaxation time scale of the network. For a double network, by contrast, significant rearrangements of the micelles occur as a crack nucleates and propagates. We show that birefringence develops at the crack tip over a finite length, $ξ$, which corresponds to the length scale over which micelles alignment occur. We find that $ξ$ is larger for slower cracks, suggesting an increase of ductility.
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