Effect of Solvents on the Performance and Structure of Polymethylacrylimide Aerogels

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-10-24 DOI:10.1021/acs.langmuir.4c0318710.1021/acs.langmuir.4c03187

Zhaohui Bai, Liang Xu, Yupei Zhao, Jing Zhang* and Qun Chen*,

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Abstract

Solvent effects play a critical role in solution polymerization, especially in free radical polymerization, where they influence both monomer–solvent interactions and the resulting polymer structure. In this study, polymethacrylimide (PMI) aerogels were synthesized via freeze-drying using dimethylformamide (DMF), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO) as solvents. The effects of monomer reactivity ratios, monomer distribution, and solvent–monomer interactions on the shrinkage, bulk density, pore size, and compressive properties of the aerogels were investigated. Results demonstrated that solvent choice significantly impacted the polymerization process, leading to variations in the structure and properties of the final aerogels. Notably, aerogels synthesized in DMSO, the most polar solvent, exhibited the lowest shrinkage (33.98%), highest density (0.1582 g·cm^–3), and highest compressive stress (1695.48 kPa at 70% strain). These findings underscore the importance of solvent selection in controlling the microstructure and enhancing the mechanical performance of PMI aerogels.

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溶剂对聚甲基丙烯酰亚胺气凝胶性能和结构的影响

溶剂效应在溶液聚合过程中起着至关重要的作用，尤其是在自由基聚合过程中，溶剂效应会影响单体与溶剂之间的相互作用以及由此产生的聚合物结构。本研究以二甲基甲酰胺（DMF）、二甲基乙酰胺（DMAc）和二甲基亚砜（DMSO）为溶剂，通过冷冻干燥合成了聚甲基丙烯酰亚胺（PMI）气凝胶。研究了单体反应比、单体分布以及溶剂-单体相互作用对气凝胶收缩率、体积密度、孔径和压缩性能的影响。结果表明，溶剂的选择对聚合过程有很大影响，导致最终气凝胶的结构和性能发生变化。值得注意的是，在极性最强的溶剂二甲基亚砜中合成的气凝胶表现出最低的收缩率（33.98%）、最高的密度（0.1582 g-cm-3）和最高的压缩应力（70%应变时为1695.48 kPa）。这些发现强调了溶剂选择在控制 PMI 气凝胶的微观结构和提高其机械性能方面的重要性。

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

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).