A hydrogenated nitrile butadiene rubber (HNBR) compound is subjected to ageing in a simulated oil and gas environment in accordance with ISO 23936-2 standard at two elevated temperatures (130 °C and 150 °C) for a period of up to 9 months. Shore D hardness, thermal expansion, dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR) spectroscopy, compression and compression set (CS) measurements are made before and after the chemical exposure. The hardness, modulus at short times, degree of relaxation and CS increases while the coefficient of thermal expansion in HNBR tends to decrease with ageing time and temperature. Temperature is shown to impose a greater effect on the properties than ageing time in the experiment. The elastic modulus at low frequencies of cyclic deformation (or the equilibrium modulus in stress relaxation) has a more complicated relationship with ageing time at 150 °C. It sharply increases in the first stage of ageing and then decreases later with further exposure which suggests that chain scission dominates in the later stages of hydrocarbon ageing. In contrast with the other materials, the most severely aged HNBR exhibits a much higher glass transition temperature of $\approx$  +70 °C manifesting in a very high stiffness at ambient temperature and a low thermal expansion coefficient. This effect is attributed to a dramatic change in the chemical structure of aged HNBR, i.e. complete modification of C$\equiv$N groups to amide groups yielding the growth of $T_{\mathrm{g}}$ and the corresponding variation in macroscopic properties. These results are also qualitatively evaluated in the context of potential sealing applications of the material.

氢化丁腈橡胶 (HNBR) 化合物在模拟石油和天然气环境中按照 ISO 23936-2 标准在两个高温（130  °C 和 150 °C) 长达 9 个月。在化学暴露之前和之后进行肖氏 D 硬度、热膨胀、动态机械分析 (DMA)、傅里叶变换红外 (FTIR) 光谱、压缩和压缩永久变形 (CS) 测量。硬度、短时间模量、松弛度和 CS 增加，而 HNBR 中的热膨胀系数随着老化时间和温度而降低。在实验中，温度对性能的影响大于老化时间。循环变形低频下的弹性模量（或应力松弛时的平衡模量）与 150 ℃时效时间的关系更为复杂。 ℃。它在老化的第一阶段急剧增加，然后随着进一步暴露而减少，这表明断链在烃老化的后期阶段占主导地位。与其他材料相比，老化最严重的 HNBR 表现出更高的玻璃化转变温度$\approx$  +70  °C 表现在环境温度下非常高的刚度和低热膨胀系数。这种效应归因于老化 HNBR 化学结构的巨大变化，即 C 的完全改性$\equiv$N 基团到酰胺基团产生的增长 ${吨}_{\mathrm{G}}$以及相应的宏观特性变化。这些结果也在材料潜在密封应用的背景下进行了定性评估。