Void formation in composite prepregs – Effect of dissolved moisture

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Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance (2018, background): “(cure) pressure profiles versus time, large parts can be fabricated with almost no voids, because the high pressure largely suppresses the evolution of volatiles and dissolved species and eliminates any entrapped air.(88) The removal of intra-laminar voids by means of vacuum is more difficult since ”
Effect of curing cycle on void distribution and interlaminar shear strength in polymer-matrix composites (2011, methodology): “They developed a model for void growth which was successfully applied to predicting the occurrence of voids in thermoset composite materials manufactured by liquid molding (Ledru et al., 2010), autoclave or vacuum bagging (Grunenfelder and Nutt, 2010).”
A review of out-of-autoclave prepregs – Material properties, process phenomena, and manufacturing considerations (2015, background): “humidity can reduce the gel time of the resin [36].”