Thesis supervisor: Dóra Renkeczné Tátraaljai
Location of studies (in Hungarian): HUN-REN Természettudományi Kutatóközpont Abbreviation of location of studies: TTK
Description of the research topic:
Elevated temperature, shear forces and the amount of oxygen present are the main factors determining degradation during the processing of polymers. Thermooxidation of polyolefins is an autocatalytic free radical chain reaction that can be prevented by stabilizers. Stabilizer packages usually contain a hindered phenolic primary antioxidant and a phosphorous or sulfuric type hydroperoxide decomposer (secondary stabilizer), which significantly improve the thermo-oxidative stability of the polymer melt. Several years ago the attention was called to the possible health and environmental hazard represented by traditional phenolic antioxidants. Consequently, lately the attention turned towards the possible use of natural antioxidants as potential stabilizers for polymers including polyolefins. Nature produces a large number of natural antioxidants to regulate the widest variety of chemical processes. During the research work different kind of natural antioxidants, extracts and modified but natural based antioxidants will be investigated as stabilizer in polymers.
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