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首页> 外文期刊>Journal of Applied Polymer Science >RHEOLOGICAL BEHAVIOR OF SOLUTIONS OF AMPHIPHILIC ACRYLIC COPOLYMERS IN MIXED SOLVENTS
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RHEOLOGICAL BEHAVIOR OF SOLUTIONS OF AMPHIPHILIC ACRYLIC COPOLYMERS IN MIXED SOLVENTS

机译：混合溶剂中两性丙烯酸共聚物溶液的流变行为

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摘要

A descriptive model was developed, using viscometry and light scattering, that explains the anomalous theological behavior of solutions of amphiphilic acrylic copolymers upon the addition of water. The theological behavior can be explained by considering the relative magnitudes of three interactions: the intra- and intermolecular electrostatic interactions between the ionizable acid groups in the copolymer, the intramolecular hydrophobic interactions, and the intermolecular hydrophobic interactions. The initial addition of water enhances the ionization of the acid groups, causing the electrostatic interactions between the acid groups to dominate the other two interactions. This leads to expansion of the polymer molecules and, consequently, to a relatively constant viscosity during dilution with water. Upon attaining the maximum ionization of the acid groups on the chain, the intramolecular hydrophobic interactions dominate the electrostatic repulsion, and the chains start to contract. Further addition of water leads to aggregation of the polymer chains into large polymolecular domains, resulting in a sharp decrease in the viscosity. Intermolecular hydrophobic interactions dominate the theological behavior in this stage of water dilution. (C) 1996 John Wiley & Sons, Inc. [References: 22]
机译：建立了描述性模型，使用粘度测定法和光散射法，解释了添加水后两亲丙烯酸共聚物溶液的异常流变行为。可以通过考虑以下三种相互作用的相对强度来解释神学行为：共聚物中可电离的酸基团之间的分子内和分子间静电相互作用，分子内的疏水相互作用和分子间的疏水相互作用。最初添加水会增强酸基团的离子化，导致酸基团之间的静电相互作用主导其他两个相互作用。这导致聚合物分子膨胀，因此在用水稀释期间导致相对恒定的粘度。达到链上酸基的最大电离后，分子内疏水相互作用主导静电排斥，链开始收缩。进一步添加水导致聚合物链聚集成大的多分子域，导致粘度急剧降低。在水稀释的这一阶段，分子间的疏水相互作用主导着神学行为。 （C）1996 John Wiley＆Sons，Inc. [参考：22]

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