Study on association behavior and solution properties of poly(acrylic acid-alkyl polyoxyethylene acrylate) amphiphilic copolymers

IF 2.4 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2024-03-15 DOI:10.1007/s13726-024-01296-8

Xiqiu Wang, Zhiqing Zhang, Yukun Zhang, Guodong Zhang, Fang Wang

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Abstract

Hydrophobically associating water-soluble polymers (HAWSPs), which possess surfactant and polymer properties, are extensively studied. This research work presents a novel HAWSP, poly(acrylic acid-alkyl polyoxyethylene acrylate) (P(AA-AAEO_n)), synthesized by aqueous polymerization of acrylic acid and alkyl polyoxyethylene acrylate (AAEO_n) with various ethoxy groups. The structure of P(AA-AAEOn) was characterized using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The association behavior in the solution was also evaluated through surface tension, dynamic light scattering, and rheology measurements. The findings exhibited that P(AA-AAEO_n) demonstrated noteworthy surface activity, which was amplified as the proportion of the hydrophobic group increased and could effectively reduce the water surface tension. When the concentration reached 0.01%, P(AA-AAEOn) in the solution changed from intramolecular association to intermolecular association. Additionally, P(AA-AAEO_n) manifested notable shear resistance, shear recovery, and viscoelasticity, transitioned from energy elasticity to entropy elasticity in P(AA-AAEO_n) molecules between 25 and 35 ℃. The experimental phenomena and mechanisms resulting from the association behavior of polymer molecules have undergone careful analysis. The elastic conversion of polymer molecules at varying temperatures is a noteworthy finding, which has not been extensively documented in earlier research works. A detailed analysis of this phenomenon has been conducted. However, further research is crucial to establish the prevalence of this phenomenon in HAWSPs.

Graphical abstract

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聚（丙烯酸-聚氧乙烯丙烯酸烷基酯）两性共聚物的分离行为和溶液特性研究

人们对具有表面活性剂和聚合物特性的疏水缔合水溶性聚合物（HAWSP）进行了广泛的研究。本研究工作介绍了一种新型 HAWSP--聚（丙烯酸-烷基聚氧乙烯丙烯酸酯）（P(AA-AAEOn)），它是由丙烯酸和带有不同乙氧基的烷基聚氧乙烯丙烯酸酯（AAEOn）通过水聚合反应合成的。利用傅立叶变换红外光谱（FTIR）和核磁共振光谱（NMR）对 P(AA-AAEOn)的结构进行了表征。此外，还通过表面张力、动态光散射和流变学测量评估了溶液中的结合行为。研究结果表明，P(AA-AAEOn)具有显著的表面活性，随着疏水基团比例的增加，其表面活性也随之增强，并能有效降低水的表面张力。当浓度达到 0.01% 时，溶液中的 P(AA-AAEOn) 由分子内结合转变为分子间结合。此外，P(AA-AAEOn)还表现出显著的抗剪切性、剪切恢复性和粘弹性，在25至35 ℃之间，P(AA-AAEOn)分子由能量弹性过渡到熵弹性。对聚合物分子关联行为产生的实验现象和机理进行了仔细分析。聚合物分子在不同温度下的弹性转换是一个值得注意的发现，在早期的研究工作中并没有广泛的记录。我们对这一现象进行了详细分析。然而，进一步的研究对于确定这一现象在 HAWSP 中的普遍性至关重要。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.