Effects of Functionalization on Photo-Actuatable Octa(dimethylsiloxy)silsesquioxane-Azobenzene Network Gels and their Substance Loading and Unloading Efficiencies

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2024-09-20 DOI:10.1021/acsapm.4c02245

Cory B. Sims, Ethan T. Chandler, Herenia Espitia Armenta, Nai-hsuan Hu, Joseph C. Furgal

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Abstract

The synthesis, characterization, analysis, and effect on solvent uptake of styrene, alcohol, amino, and perfluoro functionalized silsesquioxane-azobenzene hybrid gels are discussed. 4,4′-Diallyloxyazobenzene and octa(dimethylsiloxy)silsesquioxane (Q₈M₈^H) gels are generated using hydrosilylation chemistry. These gels were modified through two routes: in situ and postsynthesis modification, depending on the compatibility of the modifiers. The dynamic gel systems react to visible and UV light to expand and contract, giving them sponge-like properties. The general characteristics of each gel are illustrated through UV–vis, ATR-FTIR, TGA, NMR, and SEM imaging. Effects on their solvent uptake load and preference for various solvents/pollutants are detailed below, and notable findings include preferences of the styrene material for aromatics, perfluoro for THF, and alcohol for acetone. This is accompanied by a low affinity for water, enabling them to remove organic solvents and particulates from water. We find that selectivity for certain substances can be obtained but at the cost of the total absorptivity of the gel systems.

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功能化对光可动八(二甲基硅氧烷)硅倍半氧烷-偶氮苯网络凝胶的影响及其物质加载和卸载效率

本文讨论了苯乙烯、醇、氨基和全氟官能化硅基倍半氧烷-偶氮苯杂化凝胶的合成、表征、分析以及对溶剂吸收的影响。4,4′-Dialloxyazobenzene 和 octa(dimethylsiloxy)silsesquioxane（Q8M8H）凝胶是通过氢硅化化学反应生成的。根据改性剂的相容性，这些凝胶通过两种途径进行改性：原位改性和合成后改性。动态凝胶系统在可见光和紫外线的照射下会发生膨胀和收缩，从而使其具有类似海绵的特性。通过 UV-vis、ATR-FTIR、TGA、NMR 和 SEM 图像说明了每种凝胶的一般特性。下文详细介绍了它们对溶剂吸收负荷的影响以及对各种溶剂/污染物的偏好，值得注意的发现包括苯乙烯材料对芳烃的偏好、全氟材料对四氢呋喃的偏好以及酒精对丙酮的偏好。与此同时，它们对水的亲和力较低，因此能够从水中去除有机溶剂和微粒。我们发现，凝胶系统对某些物质具有选择性，但代价是凝胶系统的总吸收率降低。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.