Structuring of Nonionic Pluronic P123 Block Copolymer at Different Temperatures

IF 1.4 4区化学 Q4 CHEMISTRY, PHYSICAL Colloid Journal Pub Date : 2024-09-05 DOI:10.1134/s1061933x24700212

A. S. Zavalyueva, S. I. Karpov, A. N. Dubovitskaya, M. G. Holyavka, V. F. Selemenev

{"title":"Structuring of Nonionic Pluronic P123 Block Copolymer at Different Temperatures","authors":"A. S. Zavalyueva, S. I. Karpov, A. N. Dubovitskaya, M. G. Holyavka, V. F. Selemenev","doi":"10.1134/s1061933x24700212","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dynamic light scattering has been employed to investigate aqueous Pluronic P123 solutions at different temperatures and in the presence of different solvents and quercetin additives. Significant changes have been revealed in the average particle size and polydispersity index depending on the conditions. The effect of temperature on micellization of the block copolymer in aqueous solutions has been studied in a range <i>T</i> = 15–45°C, which is most often considered when using P123 in the sol–gel synthesis of silica. The most pronounced effect of temperature on the micellization of the studied surfactant has been observed at <i>T</i> = 15–20°C. In this temperature range, the scattered light intensity distribution over particle sizes has a polymodal character, which indicates the presence of macromolecules, micelles, and their aggregates in the system. A further increase in temperature up to 45°C causes no significant changes in the particle size. In aqueous solutions, micelles with a narrow size distribution (minimum polydispersity index) are formed within temperature ranges of 21–25 and 35–40°C. Substantial effects have been found when adding alkanols and polyphenolic substances as solubilizers capable of influencing the structure of micelles both in their bulk and on the surface of polar moieties of the surfactant. It has been shown that, in the presence of butanol-1, micelles are stabilized at temperatures of 15–20°C. At <i>T</i> > 30°C, the structure of micelles is transformed. As the fraction of butanol-1 in the solution increases, its influence is manifested at lower temperatures. It has been noted that ethanol has a destructive effect on micelles. Additives of quercetin exhibit an opposite effect of micelle stabilization, which leads to the formation of a homogeneous surfactant structure. It has been shown that, by varying solvent composition, the flavonoid–micelle binding can be controlled due to changes in the solvation. The greatest influence of quercetin on the structure formation of P123 has been observed at a solvent composition corresponding to ethanol-to-block copolymer molar ratio of n(EtOH) : n(P123) = 80 : 1.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloid Journal","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1134/s1061933x24700212","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Dynamic light scattering has been employed to investigate aqueous Pluronic P123 solutions at different temperatures and in the presence of different solvents and quercetin additives. Significant changes have been revealed in the average particle size and polydispersity index depending on the conditions. The effect of temperature on micellization of the block copolymer in aqueous solutions has been studied in a range T = 15–45°C, which is most often considered when using P123 in the sol–gel synthesis of silica. The most pronounced effect of temperature on the micellization of the studied surfactant has been observed at T = 15–20°C. In this temperature range, the scattered light intensity distribution over particle sizes has a polymodal character, which indicates the presence of macromolecules, micelles, and their aggregates in the system. A further increase in temperature up to 45°C causes no significant changes in the particle size. In aqueous solutions, micelles with a narrow size distribution (minimum polydispersity index) are formed within temperature ranges of 21–25 and 35–40°C. Substantial effects have been found when adding alkanols and polyphenolic substances as solubilizers capable of influencing the structure of micelles both in their bulk and on the surface of polar moieties of the surfactant. It has been shown that, in the presence of butanol-1, micelles are stabilized at temperatures of 15–20°C. At T > 30°C, the structure of micelles is transformed. As the fraction of butanol-1 in the solution increases, its influence is manifested at lower temperatures. It has been noted that ethanol has a destructive effect on micelles. Additives of quercetin exhibit an opposite effect of micelle stabilization, which leads to the formation of a homogeneous surfactant structure. It has been shown that, by varying solvent composition, the flavonoid–micelle binding can be controlled due to changes in the solvation. The greatest influence of quercetin on the structure formation of P123 has been observed at a solvent composition corresponding to ethanol-to-block copolymer molar ratio of n(EtOH) : n(P123) = 80 : 1.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

非离子型 Pluronic P123 嵌段共聚物在不同温度下的结构变化

摘要采用动态光散射法研究了在不同温度、不同溶剂和槲皮素添加剂存在下的 Pluronic P123 水溶液。结果表明，在不同条件下，平均粒径和多分散指数发生了显著变化。在 T = 15-45°C 的范围内研究了温度对水溶液中嵌段共聚物胶束化的影响，这是使用 P123 溶胶凝胶合成二氧化硅时最常考虑的温度范围。温度对所研究表面活性剂胶束化的影响在 T = 15-20°C 时最为明显。在此温度范围内，颗粒大小的散射光强度分布具有多模态特征，这表明体系中存在大分子、胶束及其聚集体。温度进一步升高至 45°C 不会导致粒度发生明显变化。在水溶液中，21-25 和 35-40°C 的温度范围内会形成粒度分布较窄的胶束（最小多分散指数）。在添加烷醇和多酚物质作为增溶剂时，发现它们对胶束的结构有很大影响，无论是胶束的体积还是表面活性剂极性分子的表面。研究表明，在丁醇-1 的存在下，胶束在 15-20°C 的温度下会趋于稳定。在温度为 30°C 时，胶束的结构发生了变化。随着溶液中丁醇-1 含量的增加，其影响在较低温度下就会显现出来。乙醇对胶束有破坏作用。槲皮素添加剂则表现出与胶束稳定相反的效果，从而形成均匀的表面活性剂结构。研究表明，通过改变溶剂成分，黄酮类化合物与胶束的结合可因溶解度的变化而得到控制。在乙醇与嵌段共聚物的摩尔比为 n(EtOH) : n(P123) = 80 : 1 时，槲皮素对 P123 结构形成的影响最大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Colloid Journal 化学-物理化学

CiteScore

2.20

自引率

18.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.