Degradation in the presence of oxygen

Contents 1. Introduction Polymer Degradation in the Presence of Oxygen 500... 

Schematic description of polymer degradation in the presence of oxygen.

Tomatoes were covered with a hydrochloric acid solution, pH of 1.2-1.6, to inactivate microorganisms and plant enzymes (16). Pre-peeled tomatoes were stored in acid solutions successfully. Fructose and carotene degradation in the presence of oxygen were practical disadvantages. The processing and acidified bulk storage of semifinished fruits and vegetables reduced costs and improved quality (17). 

Usually, peroxy radicals are formed at the beginning of polymer degradation in the presence of oxygen [35] ... 

In many cases, plastics degrade in the presence of oxygen at irradiation doses that are without influence or result in crosslinking in vacuum. Because of oxidation, ultimate tensile strength and strain at break in polyethylene, polypropylene, polyvinyl chloride, polystyrene and in styrene-copolymers decrease faster with increasing doses when irradiated in air than when irradiated in a vacuum, whereas this is not the case for polyethylene terephthalate, polyvinyl alcohol, and acetyl cellulose. Oxidative degradation is also the reason for radiation damage doses that are notably smaller when irradiated in air than when irradiated in a vacuum [711],... 

Selected free radical scavengers, which were expected to reduce PAA degradation in the presence of oxygen, actually accelerated the rate of degradation. 

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