Temperature and pH dual dependent conformational transition of polyacrylic acid modified by dehydroabietic alcohol

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-12-24 DOI:10.1007/s42114-024-01146-4

Xiufang Zhu, Weihao Liu, Najla AlMasoud, Taghrid S. Alomar, Jiuxiao Sun, Chao Fu, Juying Zhou

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Abstract

A rosin derivative, dehydroabietic alcohol (DHAA), was synthetized and employed to graft onto polyacrylic acid (PAA) via the Steglich esterification reaction, forming a block copolymer consisting of the acrylic acid units and monomer units containing ester groups. The resulted dehydroabietic alcohol grafted polyacrylic acid (DHAA-graft-PAA) demonstrated enhanced pH and temperature sensitivities. The number ratio of the acrylic acid monomer units reacted with the DHAA and the unreacted acrylic acid monomer units was estimated by the NMR results. The number-average molecular weight of DHAA-graft-PAA was determined to be 9290 by an acid-base titration method. The optimal decomposition temperature of DHAA-graft-PAA measured using a thermogravimetric analyzer was approximately 289 °C. The structural characteristics of the DHAA-graft-PAA were analyzed using Fourier transform infrared spectroscopy, ultraviolet (UV) spectroscopy, and proton nuclear magnetic resonance spectroscopy (¹HNMR). The conformational transition of the DHAA-graft-PAA under different pH and temperature values was investigated. The scattering intensity experiments showed that 7.96 was a critical pH value and 5 °C was a critical temperature. When the pH value was below 7.96, the degree of carboxyl group ionization in the polymer was decreased, leading to a repulsion between the carboxyl groups in the polymer chains and causing the chain contraction. When the temperature dropped to 5 °C, the conformation transitioned from an extended state to a contracted state. This study demonstrates the intelligent applications for a novel pH and temperature-sensitive polymer.

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脱氢枞醇改性聚丙烯酸的温度和pH双依赖性构象转变

合成了松香衍生物脱氢枞醇（DHAA），并通过Steglich酯化反应接枝到聚丙烯酸（PAA）上，形成了由丙烯酸单元和含酯基单体单元组成的嵌段共聚物。所制得的脱氢枞醇接枝聚丙烯酸（dhaa -接枝paa）具有增强的pH和温度敏感性。通过核磁共振结果估计了与DHAA反应的丙烯酸单体单元与未反应的丙烯酸单体单元的数目比。用酸碱滴定法测定了dhaa接枝paa的数平均分子量为9290。热重分析仪测得dhaa接枝- paa的最佳分解温度约为289℃。采用傅里叶变换红外光谱、紫外光谱和质子核磁共振光谱分析了dhaa接枝paa的结构特征。研究了dhaa接枝paa在不同pH值和温度下的构象转变。散射强度实验表明，临界pH值为7.96，临界温度为5℃。当pH值低于7.96时，聚合物中羧基的离子化程度降低，导致聚合物链中羧基之间产生排斥，导致链收缩。当温度降至5℃时，构象由扩展态转变为收缩态。该研究展示了一种新型pH和温度敏感聚合物的智能应用。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.