We adopt Langevin dynamics to explore the stress-structure relationship of telechelic reversible associating polymer gel during startup shear flow, with shear strengths varying from W_i = 12.6 to W_i = 12640. At weak shear flow W_i = 12.6, the shear stress proportionally increases with shear strain at short times, followed by a strain hardening behavior and then passes through a maximum (σ_max, γ_max) and finally decreases until it reaches the steady state. During the evolution of stress, the gel network is only slightly broken and essentially maintains its framework, and the strain hardening behavior originates from the excessive stretching of chains. On the other hand, the stress-strain curve at intermediate shear flow W_i = 505.6 shows two differences from that at W_i = 12.6, namely, the absence of strain hardening and a dramatic increase of stress at large strains, which is caused by the rupture of gel network at small strains and the network recovery at large strains, respectively. Finally, at very strong shear flow W_i = 6319.7, the gel network is immediately broken by shear flow and the stress-strain curve exhibits similar behaviors to those of classical polymeric liquids.

我们采用朗之万动力学探索启动剪切流时的远螯可逆缔合聚合物凝胶的应力-结构关系，剪切强度从不同W¯¯_我= 12.6到W¯¯_我= 12640.在弱剪切流W¯¯_我= 12.6，剪切应力成比例地与在短时间内剪切应变，然后进行应变硬化行为，然后增加经过最大值（σ_最大，γ_最大），最后减小直到达到稳态。在应力演变过程中，凝胶网络仅被轻微破坏并基本保持其框架，而应变硬化行为则源自链的过度拉伸。另一方面，中间剪切流W _i = 505.6时的应力-应变曲线显示出与W _i = 12.6时的应力-应变曲线的两个差异，即没有应变硬化，而在大应变时应力急剧增加，这是由于小应变时凝胶网络的破裂和大应变时网络的恢复。最后，在非常大的剪切流W _i下 = 6319.7，凝胶网络立即被剪切流破坏，应力-应变曲线表现出与传统聚合物液体相似的行为。