Abstract: Natural fiber is a biodegradable material with a wide range of sources and low price, which could effectively relieve the environmental pressure when used in place of traditional synthetic fiber to reinforce composites. However, there is an obvious limitation in the wide application of plant fiber reinforced composites due to the mismatched polarity between natural fiber matrix and resin. Effectively optimized interfacial adhesion between natural fibers and polymer matrix could be achieved by interface modification, with comprehensive properties of the composites improved. It is reported that traditional physical modification and chemical modification could damage the plant fiber and affect the mechanical properties of the composites. Thus, this paper reviews the research progress on the interfacial nano-modification with mid reaction conditions of natural fiber reinforced composites in recent years. Firstly, we introduces the physical structure and chemical composition of natural fibers briefly. Secondly, it is necessary to describe the interfacial nano-modification methods of natural fiber reinforced composites in detail. Finally, the interfacial characterization methods and practical applications of natural fiber reinforced composites are illustrated, and the future development trend about the interface modification of natural fiber reinforced composites are prospected reasonably.
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