聚合物网络溶胀和去溶胀的尺度理论,Macromolecules

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聚合物网络溶胀和去溶胀的尺度理论
Macromolecules ( IF 5.1 ) Pub Date : 2022-04-20 , DOI: 10.1021/acs.macromol.1c02553
Tetsuya Yamamoto _{1,

2} , Jonathan A. Campbell ₃ , Sergey Panyukov ₄ , Michael Rubinstein _{1,

5}

Affiliation

我们开发了膨胀和去膨胀聚合物网络弹性的标度理论。非纠缠网络的弹性主要是由于交联，纠缠网络的弹性是由于陷入纠缠。在制备条件下，未缠结的网络中单体数N _x小于缠结中的单体数N _e0而N _x > N _e0对于纠缠网络。预计在制备条件下弱纠缠的网络在膨胀时表现为未纠缠的网络。这种“解缠结”是由于相邻链在膨胀时分离而发生的，这减少了由于它们与相邻链的拓扑相互作用而对链波动的限制。如果重叠网络链的数量超过 Kavassalis-Noolandi 数，则预测在准备条件下未纠缠的网络在去膨胀时表现为纠缠网络。网络去膨胀产生的纠缠是暂时的，它们的数量随着去膨胀而增加，而被捕获的纠缠的数量通过交联固定。

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Scaling Theory of Swelling and Deswelling of Polymer Networks

We have developed a scaling theory of the elasticity of swollen and deswollen polymer networks. The elasticity of unentangled networks is primarily due to cross-links, and the elasticity of entangled networks is due to trapped entanglements. In preparation conditions, the number of monomers N_x in strands of the unentangled network is less than the number of monomers N_e0 in an entanglement strand while N_x > N_e0 for the entangled network. A network weakly entangled at preparation conditions is predicted to behave as unentangled network upon swelling. This “disentanglement” occurs due to the separation of neighboring strands upon swelling, which reduces the restrictions on the fluctuations of strands due to their topological interactions with neighboring strands. A network unentangled at preparation conditions is predicted to behave as an entangled network upon deswelling if the number of overlapping network strands exceeds the Kavassalis–Noolandi number. The entanglements produced by network deswelling are transient, and their number increases with deswelling, while the number of trapped entanglements is fixed by cross-linking. The “entanglement” upon deswelling and “disentanglement” upon swelling can be identified by measuring the concentration dependences of the elastic modulus.

更新日期：2022-04-20

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