Interfaces in Green Composites: A Critical Review
This manuscript reviews various aspects of fiber/resin interface in fiber reinforced composites, with special emphasis on green composites that use plant based fibers and sustainable resins. In this chapter we describe the importance of fiber/resin interface, factors affecting it, various modifications of fiber and resin that can be employed to improve the interfacial property and the experimental techniques to characterize the interface. The nature of the bonding between the fiber and resin and the mechanism of fiber/resin interaction are also discussed. Improving the fiber/resin interface is critical in the case of green composites since the hydrophilic plant fibers and some of the hydrophobic resins have very poor bonding. Strong adhesion at the fiber/resin interface is desirable for effective transfer of stress from broken fibers to intact fibers and, thus, to obtain good mechanical properties of the composites. However, weak bonding can provide energy absorbing modes through interface failure, making the composites tough. Thus, from the same set of fibers and resin it is possible to obtain composites with different properties simply through the control of fiber/resin interface.
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