HECOL476 Lecture Notes - Lecture 6: Thermal Oxidation, Embrittlement, Autoxidation

• School: University of Alberta
• Department: Human Ecology
• Course: HECOL476
• Professor: Jane Batcheller

Document Summary

Lecture 6: oxidation & photochemical degradation: oxidation: reaction of an organic compound ( bre or dye molecules) with oxygen in such a way that oxygen is consumes and new chemical species are formed. Usually requires an agent or catalyst to initiate it. Physical e ect may sometimes lag behind chemical changes that are taking place. Autoxidation: oxidation by direct combination with oxygen in the air. Temperature in the environment is adequate to cause thermal oxidation Mechano-oxidation: mechanical stress & strain initiates the oxidation. Physical forces acting on a polymer provide the energy needed. Any kind of oxidation that is deliberately caused by treatment with chemicals. Hydrogen chloride: reduction: add an electron, the opposite of the oxidation reaction. Decrease the oxidation state: hydrolysis: when we break bonds using water molecules. Initiation: takes something present in the polymer to react with. Inception: uptake of oxygen can be rapid if there is a catalyst present (heat/light)