Formation, Influence Mechanism and Experimental Characterization of Composite Porosity

In view of the common issue of composite porosity, the formation and influence mechanism of composite porosity were elucidated from the aspects of mechanical mixed nucleation theory and classic nucleation theory, and the characterization of porosity morphology, distribution and size were conducted through specific experiments. Results show that poor wettability of fibers, retention of vapor molecules and molecular volatilization generated during crosslinking reaction are the main reasons of porosity formation. The lower cure pressures have little effect on eliminating the porosity. With the increase of cure pressure, the porosity factor and porosity size decrease significantly. There is a power function relation of three times among porosity factor, porosity diameter and cure pressure.