Copolymerization of acrylic acid and 2- acrylamido-2-methylpropane sulfonic acid in supercritical carbon dioxide

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-11-28 DOI:10.1016/j.supflu.2024.106485

Ramses S. Meleán Brito , Juan M. Milanesio , Juan M. Padró , Cristian Villa-Pérez , Aurélie Colas , Miriam C. Strumia , Séverine Camy , Mathias Destarac , Facundo Mattea

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引用次数: 0

Abstract

This study explores the copolymerization of acrylic acid and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) in supercritical carbon dioxide (scCO₂) as a sustainable alternative to traditional solvent-based methods. Using free-radical polymerization in scCO₂, copolymers were synthesized without the need for additional drying. The influence of AMPS concentration in the feed on copolymer properties was investigated, achieving reactions with monomer conversions ranging from 61.3 to 92.9 mol%. Analytical characterization confirmed low AMPS incorporation across samples, with molar mass and hydrodynamic properties varying based on the AMPS content. Notably, two distinct polymer configurations were observed depending on whether the initial AMPS concentration was above or below 12 mol%, with polymers exhibiting molar masses between 13.2×10⁵ and 14.2×10⁵ g mol⁻¹. Rheological analysis revealed that higher AMPS concentrations led to increased hydrodynamic radii, enhanced thickening capacity, and improved resistance to both monovalent (NaCl) and divalent (CaCl₂) salts in aqueous solutions.

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丙烯酸与2-丙烯酰胺-2-甲基丙烷磺酸在超临界二氧化碳中的共聚

本研究探讨了丙烯酸和2-丙烯酰胺-2-甲基-1-丙磺酸（AMPS）在超临界二氧化碳（scCO2）中的共聚，作为传统溶剂基方法的可持续替代方案。在scCO2中采用自由基聚合法合成共聚物，无需额外的干燥。研究了进料中AMPS浓度对共聚物性能的影响，得到了单体转化率为61.3 ~ 92.9 mol%的反应。分析表征证实了样品中AMPS的掺入率较低，其摩尔质量和流体动力学性质根据AMPS含量而变化。值得注意的是，根据初始AMPS浓度高于或低于12 mol%，观察到两种不同的聚合物构型，聚合物的摩尔质量在13.2×10和14.2×10之间。流变学分析表明，较高的AMPS浓度会增加流体动力半径，增强增稠能力，并提高水溶液中对一价（NaCl）和二价（cacl2）盐的抗性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.