Abstract

The surface of the natural fibers intended for application as reinforcement in polymer composite materials has to be altered in order to reach a significant improvement of the interfacial interactions at the fiber-polymer interface, which entails material properties superior to those of the corresponding composites based on raw natural fibers or unreinforced polymers. There are different approaches to modify the surface of the natural fibers, but the basic are the chemical, physical, and biological methods. Physical treatments, depending on their duration and intensity, can cause cleaning/purification and defibrillation, and chemical modification of the fiber surface (generating reactive centers such as: sites with modified electronic density, macro- or oligo-radicals, oxygen-containing functional groups etc.). Consequently, the modified fibers achieve higher wettability and compatibility with polymers in various composite formulations.

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