准备和性能改善的二二醇-乙基酸盐修饰的三氧表面活性剂
Xinze Li1, Ling Zhang2,3, Yibo Li2,3
1Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Langmuir : the ACS journal of surfaces and colloids
|October 4, 2024
概括
合成了一种新的表面活性剂 (G2),提高了泡的稳定性和水解阻力. 与传统选择相比,这种改性三氧表面活性剂在水系统中提供了更好的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 聚合物化学 聚合物化学
背景情况:
- 表面活性剂具有理想的特性,如低表面能量和生物相容性.
- 传统的聚乙烯改性表面活性剂在非中性水性环境中面临泡稳定性和水解方面的限制.
研究的目的:
- 合成一种新型的二醇-乙氧酸盐修饰的三氧表面活性剂 (G2).
- 为了评估G2的表面活性,聚合,湿,散布,泡和水解稳定性.
- 为了比较G2的性能与传统的基聚乙烯-基基改性三素 (X5) 的性能.
主要方法:
- 通过将二二醇乙氧酸盐移植到甲基三素上来合成G2.
- 使用里埃变换红外光谱 (FT-IR) 和质子核磁共振 (H NMR) 的结构特征.
- 使用表面张力计,传输电子显微镜 (TEM),动态光散射 (DLS) 和接触角测试仪评估表面性能.
主要成果:
- G2有效地将水的表面张力降低到19.24 mN/m,其微粒度 (CMC) 低至40.44 mg/L.
- 合成的G2表面活性剂显著改善了泡性质和水溶液中的水解稳定性.
- G2的性能超过了基聚氧乙烯乙改性三素 (X5) 的性能.
结论:
- 脱二醇-乙氧酸盐修饰增强了三氧表面活性剂的性能.
- 对于在水系统中需要稳定且耐水解的表面活性剂的应用,G2是一个有希望的替代品.
相关概念视频
02:33Preparation and Reactions of Thiols
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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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