Effect of triphenylphosphine addition for the fast curing epoxy-anhydride CFRP system

In this study, we investigated the impact of adding Triphenylphosphine (TPP) at concentrations of 1$$wt.%, 3$$wt.%, and 5$$wt.% to an epoxy-anhydride system that displays, a degradation in mechanical properties at high temperatures. We conducted an analysis of cure behavior using differential scanning calorimetry and evaluated flexural, shear, and tensile strengths at room temperature. To assess heat resistance, CFRP specimens were exposed to 100^∘C for 1$$h, and tensile strengths were subsequently measured. The addition of 3$$wt.% TPP resulted in a 5$$min reduction in the time required to reach a 95% degree of cure, but it was observed that mechanical properties at room temperature were compromised. CFRP exposed to 100^∘C indicated that an increase in TPP content helped mitigate the degradation of mechanical properties.