Impact of Lithium halides on rheological properties of aqueous solution of poly(vinyl alcohol)
Impact of Lithium halides on rheological properties of aqueous solution of poly(vinyl alcohol)
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DOI：
10.1007/s10965-020-02198-y
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发表时间：
2020-07-18
影响因子：
2.8
通讯作者：
Yamaguchi, Masayuki
中科院分区：
文献类型：
--
作者：
Saari, Riza Asmaa;Maeno, Ryota;Yamaguchi, Masayuki
本研究的重点是添加锂盐，如LiI，LiBr和LiCl对含有15重量%的聚乙烯醇（PVA）的水溶液的流变性能的影响。在低频率区域中的剪切储能模量中存在平台，表明这种溶液具有归因于PVA的氢键的网络结构。平台模量值随温度和锂盐的加入而明显降低。实验结果还表明，在盐中的阴离子物种起着重要的作用，在确定流变性能，包括平台模量的大小。碘阴离子，这是被归类为一个“水结构断路器”的离子在霍夫迈斯特系列，有效地降低了两个振荡剪切模量，包括平台模量。然而，在高温下，由于氢键的程度降低，添加LiI的效果降低。
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.