水溶液
稀释
化学
聚合物
盐(化学)
粘度计
钠
单体
海藻酸钠
侧链
高分子化学
化学工程
热力学
有机化学
粘度
物理
工程类
作者
Arnab Banerjee,Ranjit De,Bijan Das
标识
DOI:10.1016/j.carbpol.2021.118855
摘要
Insight into the role of electrostatic interactions on the hydrodynamics and conformation of aqueous sodium alginate was gained through viscometry. Alginate chains are found to shrink in salt-free solutions more rapidly with increasing polymer concentration compared to salt-solutions. For salt-free solutions, a reduced polymer concentration of less than 1 suffices to make the alginate coil volume half of that at infinite dilution which becomes invariant when the reduced concentration exceeds 8. In saline media having salt concentration greater than 0.1 mol·L-1, the chains become more flexible, caused by the shielding of intra-chain repulsions. The chains effectively reached unperturbed state when the added salt concentration becomes ≥0.5 mol·L-1. Alginate chains are shown to remain stiff up to about 8-10 monomers within the investigated temperature range. This study explores the possible modification of the individual chain behavior induced by the neighboring chains or by the variation of temperature.
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