Lopez Carlos G
Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
ACS Macro Lett. 2019 Aug 20;8(8):979-983. doi: 10.1021/acsmacrolett.9b00161. Epub 2019 Jul 22.
We study the entanglement properties of polyelectrolytes in salt-free and excess-salt solutions, corresponding to rod-like and expanded coil conformations, respectively. While the solvent's ionic strength has a large impact on the conformation of polyelectrolytes, it does not affect its entanglement density and entanglement crossover. This contradicts current models of polymer entanglement and suggests that the density of binary contacts in solution is not affected by the solvent quality. Based on this observation, we work out the reptation dynamics of polyelectrolytes in salt-free solution, which differ appreciably from earlier models.
我们研究了聚电解质在无盐溶液和高盐溶液中的纠缠特性，它们分别对应棒状和伸展的线圈构象。虽然溶剂的离子强度对聚电解质的构象有很大影响，但它不影响其纠缠密度和纠缠转变。这与当前的聚合物纠缠模型相矛盾，并表明溶液中二元接触的密度不受溶剂质量的影响。基于这一观察结果，我们得出了无盐溶液中聚电解质的爬行动力学，这与早期模型有明显不同。
