Abstract
Few changes have occurred in the use of various stabilizers over recent years. In the current literature, phosphate derivatives are used as anti-ageing additives in polymers, and the most popular of these are sterically hindering cyclic amines. However, most of these compounds are carcinogenic. Synthetic phenols have been increasingly used as antioxidants in food and in polymers. Ecological standards encourage the elimination of harmful additives in polymeric products that come in contact with food or with the human body. This article presents application of flavonoid (silymarin/flavonoligand) for polymer stabilization and use of natural phytocompounds such as color indicators of polymers ageing time. In this research, I propose two ways of application: traditional, during processing; and the new one, by using impregnation method. Based on the change of deformation energy (ageing coefficient K), FTIR, oxidative induction time (OIT) evaluated by differential scanning calorimetry (OIT), thermogravimetry analysis (TG), spectrophotometric color measurements in terms of CIE-Lab color space values, I confirmed the high antioxidant activity of flavonoids in EPM. They provide coloration of the polymeric materials that changes cyclically as a function of aging time. Additionally, the use of phytocompounds in polymers provides similar stabilizing effect to those of synthetic antioxidants.
Highlights
The polymer lifetime is determined by the effectiveness of the stabilizers
The addition of anti-ageing substances derived from flavonoids considerably improves the resistance of polymeric composites to ageing, especially under UV irradiation and climatic conditions with variable air humidity and solar radiation
The addition of anti-ageing substances derived from flavonoids considerable improves the resistance of polymeric composites to ageing, especially under UV irradiation and climatic conditions with variable air humidity and solar radiation
Summary
The polymer lifetime is determined by the effectiveness of the stabilizers. All of the polymers undergo degradation when exposed to an outside environment under sunlight. The preparation of new Polymers 2015, 7 polymeric materials for technological applications requires a good understanding of the possible mechanisms that determine the oxidation processes in the materials. The available literature suggests that there are several known major groups of stabilizers. The division is determined by the types of environmental factors against which the material should be protected [1–20]. One of the most important groups of stabilizers are, undoubtedly, antioxidants. The polymer industry used synthetic antioxidants but it seems recently that more interest is directed towards natural substances with anti-aging properties. Natural antioxidants may be a new, environmentally friendly alternative to the aromatic amines commonly used in polymers
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