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QENS study on local segmental dynamics of polyelectrolytes in complex coacervates
Polymer ( IF 4.6 ) Pub Date : 2022-11-18 , DOI: 10.1016/j.polymer.2022.125525
Sojeong Kim, Won Bo Lee, Nicolas R. de Souza, Soo-Hyung Choi

The segmental dynamics of complex coacervates were investigated as a function of salt concentration and a charge type using quasi-elastic neutron scattering (QENS). The coacervates were prepared by mixing two oppositely charged polyether-based polyelectrolyte solutions functionalized for cationic ammonium and guanidinium groups or anionic sulfonate groups. For the QENS time scale, the intrinsic ion pairs were considered effective cross-links, and therefore the dynamics of chain segments between the intrinsic junctions were probed. We observed that as salt concentration increases, both the number of mobile chain segments and their segmental dynamics increase for ammonium-based coacervates where the electrostatic interaction primarily governs the phase behavior. However, the guanidinium-based coacervates show slow and nearly identical segmental relaxation independent of the salt concentration, which is potentially attributed to the non-electrostatic interactions. The combination of the chemical structure of ionic moieties, salt concentration, and temperature plays a significant role to determine polymer chain dynamics mainly affected by the strength of ionic bonding.



中文翻译:

QENS 研究复杂凝聚层中聚电解质的局部分段动力学

使用准弹性中子散射 (QENS) 研究了复杂凝聚层的分段动力学作为盐浓度和电荷类型的函数。通过混合两种带相反电荷的聚醚基聚电解质溶液来制备凝聚层,这些聚电解质溶液针对阳离子铵和胍基团或阴离子磺酸盐基团进行了官能化。对于 QENS 时间尺度,本征离子对被认为是有效的交联,因此探测了本征连接之间链段的动力学。我们观察到,随着盐浓度的增加,铵基凝聚层的移动链段数量及其链段动力学都会增加,其中静电相互作用主要控制相行为。然而,基于胍盐的凝聚层显示出缓慢且几乎相同的节段松弛,与盐浓度无关,这可能归因于非静电相互作用。离子部分的化学结构、盐浓度和温度的组合对于确定主要受离子键强度影响的聚合物链动力学起着重要作用。

更新日期:2022-11-18
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