The present study focused on the effects of the addition of lithium salts such as LiI, LiBr and LiCl on the rheological properties of aqueous solutions containing 15 wt% poly(vinyl alcohol) (PVA). There was a plateau in the shear storage modulus in the low frequency region, demonstrating that such solutions have a network structure attributed to hydrogen bonding of the PVA. The value of the plateau modulus evidently decreased with temperature and with the addition of lithium salts. The experimental results also demonstrated that the anion species in the salt plays an important role in determining the rheological properties, including the magnitude of the plateau modulus. The iodide anion, which is classified as a “water-structure-breaker” ion in the Hofmeister series, effectively decreased both oscillatory shear moduli including the plateau modulus. However, the effect of adding LiI decreased at high temperatures, owing to the reduced extent of hydrogen bonding.

本研究集中于添加锂盐（例如LiI，LiBr和LiCl）对包含15 wt％聚乙烯醇（PVA）的水溶液的流变特性的影响。低频区域的剪切储能模量处于平稳状态，表明这种溶液具有归因于PVA氢键的网络结构。平稳模量的值明显随温度和添加锂盐而降低。实验结果还表明，盐中的阴离子在决定流变特性（包括平稳模量）方面起着重要作用。碘化物阴离子，在Hofmeister系列中被归类为“破坏水结构的离子”，有效地降低了包括平稳模量在内的两个振荡剪切模量。但是，由于氢键的程度降低，因此在高温下添加LiI的效果降低。