Evaluation of Effect of Surface Modification on Correlation Between Permeability of Glass Fiber/Resin and Capillary Number

Abstract

In this study, we experimentally evaluated the correlation between the microscopic resin flow and permeability of a glass cloth, which surface was modified by silane coupling agent. We focused on the capillary number, which is a parameter determining the microscopic resin impregnation behavior within and between fiber bundles. The capillary numbers were classified into different parameters based on their dependency on temperatures and pressures. First, we obtained the temperature condition for each resin, to make the ratio between resin viscosity and (surface tension ・contact angle), constant be Under these temperature conditions, the pressure conditions were determined to be the resin impregnation rate constant. The permeability was evaluated with three types of resins under three conditions of capillary numbers. As a result, the permeabilities of the different resin systems were approximately equal. Therefore, it was found that the macroscopic permeability was not significantly influenced by the capillary number representing microscopic resin flow.