Formation of layered cell structure in silicone rubber foam via supercritical CO2-induced crosslinking

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-04-01 DOI:10.1016/j.supflu.2025.106614

Zuoze Fan, Bo Wang, Lei Zhang, Ruyun Xu, Guangxian Li, Xia Liao

引用次数: 0

Abstract

Crosslinking behavior of liquid silicone rubber (LSR) in CO₂ is important for regulation of cell structure of LSR foam. In LSR system, introduction of CO₂ can change the crosslinking reaction, but the effect of the crosslinking in CO₂ on foaming behavior is not clear. Here, LSR was saturated at 40 °C and 10 MPa CO₂ in order to introducing more CO₂ to investigate crosslinking in CO₂ and foaming behavior. It was found that the obtained LSR foam had a layered cell structure, because CO₂ induced the formation of crosslinking layer, and hindered further crosslinking between layers by increasing the distance between layers. Compressive stress perpendicular to the layer of LSR foam was 3.1 times higher than that along the layer when the strain was 50 %. This study provides a new idea for the regulation of cell structure of thermosetting polymers.

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超临界co2诱导交联在硅橡胶泡沫中形成层状细胞结构

液体硅橡胶（LSR）在CO2中的交联行为对LSR泡沫的胞孔结构有重要的调控作用。在LSR体系中，CO2的引入可以改变交联反应，但CO2交联对发泡行为的影响尚不清楚。本文将LSR在40 °C和10 MPa CO2条件下饱和，以引入更多的CO2来研究CO2交联和发泡行为。结果表明，制备的LSR泡沫具有层状细胞结构，这是因为CO2诱导了交联层的形成，并通过增加层间距离阻碍了层间进一步交联。当应变为50% %时，垂直于LSR泡沫层的压应力比沿LSR泡沫层的压应力高3.1倍。本研究为热固性聚合物细胞结构的调控提供了新的思路。

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

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.