The changes in the glass transition (T_g) of elastomers due to high-pressure gases can have important consequences for their mechanical, physical, and thermal properties. In this work, the behavior of T_g of un-cross-linked and cross-linked hydrogenated nitrile rubbers (HNBR) under pressure was investigated. The cross-link density, chemical structure of the rubber, and filler loading were varied. It was observed that the T_g of the un-cross-linked HNBR (without any filler) decreased with the increasing pressure of nitrogen gas and was accompanied by increasing solubility of N₂ gas in the elastomer. However, increased cross-link density, filler content, and acrylonitrile (ACN) content in the HNBR significantly increased the T_g value under pressure. A theoretical thermodynamic model that relates the pressure dependence of the volumetric properties of an elastomer, based on the principles of corresponding states, was used to model the experimental data. The work will help in the design of elastomeric products used in high-pressure environments.

中文翻译：

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揭示氢化丁腈橡胶玻璃化转变温度的压力诱导动力学


高压气体导致的弹性体玻璃化转变温度 ( T _g ) 的变化可能对其机械、物理和热性能产生重要影响。在这项工作中，研究了未交联和交联氢化丁腈橡胶（HNBR）在压力下的T _g行为。橡胶的交联密度、化学结构和填料含量各不相同。观察到未交联的HNBR（不含任何填料）的T _g随着氮气压力的增加而降低，并且伴随着N ₂气体在弹性体中的溶解度的增加。然而，HNBR 中交联密度、填料含量和丙烯腈 (ACN) 含量_的增加显着提高了压力下的Tg值。基于相应状态的原理，使用与弹性体体积特性的压力依赖性相关的理论热力学模型来对实验数据进行建模。这项工作将有助于设计用于高压环境的弹性体产品。