硅橡胶在高压流体中的交联反应和发泡行为研究

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-10-30 DOI:10.1016/j.supflu.2024.106449

Bo Wang, Wanyu Tang, Zuoze Fan, Ruyun Xu, Guangxian Li, Xia Liao

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引用次数: 0

摘要

高压气体可能会影响 MVQ 在饱和过程中的分子链运动、链相互作用和交联行为。本文通过比较 MVQ 在空气、CO2 和 N2 中的交联放热行为，发现超临界 CO2（scCO2）可通过增强溶胀和分子链的流动性来促进 MVQ 的交联反应。流变特性结果表明，MVQ 在 CO2 中的交联和增塑作用之间存在竞争关系。通过平衡交联密度和塑化效果，设计出了具有不同细胞结构和孔隙率的 MVQ 泡沫。该研究制备的 MVQ 泡沫具有优异的压缩机械性能，在应变为 40% 时压缩应力可达 1839 kPa。本文在交联反应和细胞结构调节方面为制备热固性聚合物泡沫提供了参考。

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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Study on the crosslinking reaction and foaming behavior of silicone rubber in high-pressure fluids

High-pressure gas might affect the molecular chain movement, chain interaction, and crosslinking behavior of MVQ during the saturation process. In this paper, by comparing crosslinking exothermic behaviors of MVQ in air, CO₂, and N₂, it is found that the supercritical CO₂ (scCO₂) can promote crosslinking reaction of MVQ through enhancing the swelling and molecular chain's mobility. The result of rheological property shows the competitive relationship between crosslinking and plasticizing effects of MVQ in CO₂. MVQ foams with different cellular structures and porosity are designed by balancing the crosslinking density and plasticization effect. MVQ foams prepared in this study have excellent compressive mechanical properties, and compressive stress can reach up to 1839 kPa at 40 % strain. This paper offers a reference for preparing thermosetting polymer foams in the aspect of crosslinking reaction and cellular structure regulation.

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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.