Diisopropyl methyl phosphonate (DIMP) is an organophosphorus compound used as a surrogate of sarin, a chemical weapon agent. Thermal decomposition of DIMP and similar liquids may be affected by added inorganic solids. Understanding such effects is needed to guide decontamination and environmental mitigation work. Here, liquid DIMP mixed with powders of γ-Al₂O₃ or SiO₂, was heated to 350 °C in a thermogravimetric analyzer while observing effluent gas using a mass spectrometer. For both powders, evaporation of DIMP occurred between 50 and 200 °C, followed by a second mass loss step up to 350 °C. The amount of DIMP evaporated in the first step varied; however, the size of the second, mass loss step was consistent between experiments for each solid used. For γ-alumina, 2-propanol and propene were released below the DIMP boiling point and mostly propene at higher temperatures. Calcining alumina prior to exposure to DIMP reduced the release of 2-propanol. For silica, the second mass loss step was smaller and only propene was released. Powders exposed to DIMP and recovered at different temperatures showed FTIR peaks corresponding to the individual bond vibrations of DIMP. At higher temperatures, only the P-CH ₃ stretching vibration was observed.

甲基膦酸二异丙酯 (DIMP) 是一种有机磷化合物，用作化学武器制剂沙林的替代物。DIMP 和类似液体的热分解可能会受到添加的无机固体的影响。需要了解这些影响来指导去污和环境缓解工作。此处，液体 DIMP 与 γ-Al ₂ O ₃或 SiO _{2粉末混合}, 在热重分析仪中加热到 350 °C，同时使用质谱仪观察流出气体。对于这两种粉末，DIMP 的蒸发发生在 50 至 200 °C 之间，随后是高达 350 °C 的第二次质量损失步骤。第一步蒸发的 DIMP 量不同；然而，第二个质量损失步骤的大小在所用每种固体的实验之间是一致的。对于 γ-氧化铝，2-丙醇和丙烯在 DIMP 沸点以下释放，大部分丙烯在较高温度下释放。在暴露于 DIMP 之前煅烧氧化铝减少了 2-丙醇的释放。对于二氧化硅，第二个质量损失步骤较小，仅释放丙烯。暴露于 DIMP 并在不同温度下回收的粉末显示出与 DIMP 的各个键振动相对应的 FTIR 峰。在更高的温度下，只有 P-CH₃观察到伸缩振动。