Polycarbonate (PC) offers excellent impact resistance, high elongation at break and high glass transition temperature making it a candidate for toughening composite laminates. Therefore, PC films were selected to interleave bi-directional glass fiber (GF)/epoxy composites to study mode I and mode II interlaminar fracture toughness. PC films with smooth and textured surface finishes and oxygen plasma treatment were used to examine their effect on composite toughening using double cantilever beam and end notched flexure tests for mode I and II interlaminar fracture toughness characterization, respectively. Oxygen plasma functionalization improved wetting and adhesive bonding of PC film with epoxy. Increase up to 71% in mode I and 42% in mode II interlaminar fracture toughness for interleaved composites was measured. The microscopic observations of fractured surfaces indicate that improved toughness in the case of PC interleaves is related to promoting cohesive-adhesive failure of the film, providing additional energy dissipating mechanisms during delamination propagation. Dynamic mechanical analysis revealed that PC films are able to preserve high operational temperature of composite.

聚碳酸酯（PC）具有出色的抗冲击性，高断裂伸长率和高玻璃化转变温度，使其成为增韧复合材料层压板的候选材料。因此，选择PC膜来交织双向玻璃纤维（GF）/环氧树脂复合材料，以研究I型和II型层间断裂韧性。使用具有I型和II型层间断裂韧性特征的双悬臂梁和端部缺口挠曲测试，分别对具有光滑和纹理表面光洁度以及氧等离子体处理的PC膜，以检查它们对复合材料增韧的影响。氧等离子体功能化改善了PC膜与环氧树脂的润湿性和粘合性。测量了交错复合材料的I型和II型的层间断裂韧性分别提高了71％和42％。断裂表面的微观观察表明，在PC交错的情况下，改善的韧性与促进薄膜的内聚-粘合破坏有关，在分层传播过程中提供了额外的耗能机制。动态力学分析表明，PC膜能够保持复合材料的较高工作温度。