Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request. References 1, , and , “The Effect of Curing Additive on the Mechanical Properties of Phthalonitrile-Carbon Fiber Composites,” Polymer Composites 25 (2004): 554–561. 2, “Phthalonitrile-Based High Temperature Resin,” Journal of Polymer Science Part A: Polymer Chemistry 26 (1988): 3199–3212.
