The main physical properties of fiber-reinforced composites are derived from the fibers. In order for matrix resins to support fiber reinforcement, they must sufficiently impregnate the fibers and be strong themselves.
As the fiber-supporting resin impregnates fibers, it fills the spaces between them. If the viscosity of the resin is too high, this impregnation process may take a long time or leave spaces between fibers unfilled.
Due to its low viscosity, PDCP is quickly impregnated and can completely and thoroughly impregnate fibers.
At the same time, fractures in fiber-reinforced composite resins mainly occur in the layers between fibers—the resin part.
Using high-impact resistant PDCP as the matrix resin makes possible the creation of a composite material in which the interlaminar fracture does not progress all at once.