Polymers, Vol. 17, Pages 2696: Kinetics of Carboxylic Acids Formation During Polypropylene Thermooxidation in Water Saturated with Pressurized Oxygen

Polymers doi: 10.3390/polym17192696

Authors:
Vadim V. Zefirov
Polina S. Kazaryan
Andrey I. Stakhanov
Svetlana V. Stakhanova
Mikhail M. Ilyin
Ivan A. Godovikov
Elizaveta V. Shmakova
Andrey G. Terentyev
Alexander V. Dudkin
Elena P. Kharitonova
Marat O. Gallyamov
Alexei R. Khokhlov

In this paper we study in detail the products formed during the process of water-assisted thermal oxidative decomposition (TOD) of polypropylene in the presence of pressurized oxygen. A set of techniques has shown that the main decomposition product in such a process is acetic acid with small amounts of other carboxylic acids (formic, propionic, succinic). The kinetics of carboxylic acid formation is studied by means of gas chromatography–mass-spectrometry as well as capillary electrophoresis, and the possible mechanisms behind the products formation are discussed. The role of water is considered based on the results obtained from substituting H2O with D2O in TOD. Compositions of residual oligomeric fractions as well as gas products are analyzed.

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