论文标题
非缠绕聚电解质的扩散和粘度
Diffusion and viscosity of non-entangled polyelectrolytes
论文作者
论文摘要
我们报告了通过脉冲场梯度NMR和旋转流变率分别测量的半二硫化盐水溶液中聚苯乙烯磺酸钠（NAPS）的链自扩散和粘度数据。观察到的浓度依赖性$η$和$ d $与浓度依赖的单体摩擦系数的Rouse-Zimm缩放模型一致。单体摩擦系数的浓度依赖性超过了从扩散的自由体积模型预期的，其起源尚不清楚。相关斑点和稀释链与等效的端到端距离显示几乎相等的摩擦系数，与缩放一致。使用Rouse模型将粘度和扩散数据合并，以计算无盐溶液中的小睡的链尺寸，这些粘度与无盐溶液中的链尺寸合并，这些粘度与SANS测量值一致。
We report chain self-diffusion and viscosity data for sodium polystyrene sulfonate (NaPSS) in semidilute salt-free aqueous solutions measured by pulsed field gradient NMR and rotational rheometry respectively. The observed concentration dependence of $η$ and $D$ are consistent with the Rouse-Zimm scaling model with a concentration dependent monomeric friction coefficient. The concentration dependence of the monomeric friction coefficient exceeds that expected from free-volume models of diffusion, and its origin remains unclear. Correlation blobs and dilute chains with equivalent end-to-end distances exhibit nearly equal friction coefficients, in agreement with scaling. The viscosity and diffusion data are combined using the Rouse model to calculate the chain dimensions of NaPSS in salt-free solution, these agree quantitatively with SANS measurements.
