We study model near-critical polymer gelling systems made of gluten protein dispersions stabilized at different distances from the gel point. We impose different shear rates and follow the time evolution of the stress. For sufficiently large shear rates, an intermediate stress overshoot is measured before reaching the steady state. We evidence self-similarity of the stress overshoot as a function of the applied shear rate for samples with various distances from the gel point, which is related to the elastic energy stored by the samples, as for dense systems close to the jamming transition. In concordance with the findings for glassy and jammed systems, we also measure that the stress after flow cessation decreases as a power law with time, with a characteristic relaxation time that depends on the shear rate previously imposed. These features revealed in nonlinear rheology could be the signature of a mesoscopic dynamics, which would depend on the extent of gelation.

中文翻译：

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非线性剪切实验中凝胶体系的结垢特性


我们研究了由稳定在距凝胶点不同距离的面筋蛋白分散体制成的近临界聚合物凝胶系统模型。我们施加不同的剪切速率并跟踪应力的时间演变。对于足够大的剪切速率，在达到稳定状态之前测量中间应力超调。我们证明了对于距凝胶点不同距离的样品，应力超调作为所施加剪切速率的函数的自相似性，这与样品存储的弹性能有关，对于接近干扰转变的致密系统。根据玻璃状和堵塞系统的研究结果，我们还测量到流动停止后的应力随时间呈幂律下降，其特征弛豫时间取决于先前施加的剪切速率。非线性流变学中揭示的这些特征可能是介观动力学的特征，这取决于凝胶化的程度。