A new approach to the thermal oxidation of polypropylene in oxygen-enriched supercritical carbon dioxide is presented. Several parameters are revealed to affect the oxidation process, namely, the presence of supercritical carbon dioxide, the presence of Mn₂O₃ nanoparticles and oxygen to polypropylene mass ratio. It is demonstrated that the use of carbon dioxide enhances the oxidative process at lower oxygen content. Mn₂O₃ nanoparticles both increase the rate of the oxidation process and influence the product distribution. Gas chromatography-mass spectrometry reveals that acetone, acetic acid and formic acid are among the main products of the oxidation process. Furthermore, the obtained results show that, at a higher oxygen content, the use of manganese oxide aerogel as a catalyst promotes the selective oxidation of polypropylene, with acetic acid being the main liquid product of the process.

提出了一种在富氧超临界二氧化碳中热氧化聚丙烯的新方法。揭示了影响氧化过程的几个参数，即超临界二氧化碳的存在，Mn ₂ O ₃纳米颗粒的存在以及氧与聚丙烯的质量比。已经证明，二氧化碳的使用在较低的氧含量下增强了氧化过程。锰₂ O ₃纳米颗粒既增加了氧化过程的速度又影响了产物的分布。气相色谱-质谱分析表明，丙酮，乙酸和甲酸是氧化过程的主要产物。此外，获得的结果表明，在较高的氧含量下，使用氧化锰气凝胶作为催化剂促进了聚丙烯的选择性氧化，其中乙酸是该方法的主要液体产物。