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.

中文翻译：

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硅橡胶在高压流体中的交联反应和发泡行为研究


在饱和过程中，高压气体可能会影响 MVQ 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） 可以通过增强溶胀和分子链的迁移率来促进 MVQ 的交联反应。流变特性结果表明 MVQ 在 CO2 中的交联和塑化效应之间的竞争关系。通过平衡交联密度和塑化效应来设计具有不同蜂窝结构和孔隙率的 MVQ 泡沫。本研究制备的 MVQ 泡沫具有优异的压缩机械性能，在 40% 应变下，压应力可达 1839 kPa。本文从交联反应和细胞结构调控等方面为热固性聚合物泡沫的制备提供了参考。