Formation and Structure of the Interface

Generally, the polymer-based composite is a composite of a polymer with a relatively low modulus and an inorganic filler with a relatively high modulus. In the structure, there are significant differences between most of the matrix resins and the inorganic filler, and they are incompatible in chemical and physical properties. So there is an interface between them. 

To a large extent, the performance of the composite material depends on the combination of inorganic and organic phases in the composite material. 

The filler and the matrix form a whole by the interface. Stress can be transferred evenly through the interface, and the area shows excellent performance. In addition, as a result of the existence of the interface, composite materials produce discontinuous physical properties, such as interface friction and electrical resistance, heat resistance, dimensional stability, impact resistance, and so forth, and can prevent the expansion of the crack and reduce stress concentration. Therefore, 

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