高压单流体引发的超临界二氧化碳中丙烯酸+甲基丙烯酸丁酯的相界和共聚作用

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-09-17 DOI:10.1016/j.supflu.2024.106412

Ramses S. Meleán Brito , Joana E. Tasque , Juan M. Padró , Gerardo Martínez Delfa , Miriam C. Strumia , Facundo Mattea , Juan M. Giussi , Juan M. Milanesio

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引用次数: 0

摘要

通过在加压二氧化碳中沉淀聚合，合成了基于丙烯酸和甲基丙烯酸正丁酯的缔合聚合物。理化表征证实了 BMA 的加入和良好的反应产率（67.1 摩尔%）。尺寸排阻色谱法显示聚合物摩尔质量呈双峰分布，平均摩尔质量各不相同。在不同的 pH 值、离子强度和盐浓度条件下，对聚合物水溶液的流变特性进行了评估，结果表明，随着甲基丙烯酸正丁酯含量的增加，粘度也会增加，这归因于疏水作用。合成聚合物的表观粘度深受水溶液离子强度的影响。

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Phase boundaries and copolymerization of acrylic acid + butyl methacrylate in supercritical carbon dioxide under high-pressure single-fluid initiation

Associative polymers based on acrylic acid and n-butyl methacrylate were synthesized via precipitation polymerization in pressurized carbon dioxide. Physicochemical characterization confirmed BMA incorporation and good reaction yields (>67.1 mol%). Size exclusion chromatography showed bimodal polymer molar mass distribution with distinct average molar masses. Rheological properties of aqueous polymer solutions were assessed under varying pH, ionic strength, and salt concentrations and demonstrated increased viscosity with higher n-butyl methacrylate content, attributed to hydrophobic associations. The apparent viscosity of the synthesized polymers was strongly influenced by the ionic strength of the aqueous solutions.

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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.