The crystallization behavior of thermoplastic matrix is considered as an important property which can highly affect for the mechanical and thermal properties of laminated composite structures. This manuscript aims to evaluate the influence of different degrees of crystallinity induced in polyphenylene sulfide (PPS) / carbon fiber laminates, processed by hot compression molding. In the present study, the morphology, thermal and mechanical properties (compression, interlaminar shear stress, impact and end notch flexure) of the processed laminates were evaluated. From the mechanical testing results obtained, an increase in the in plane compressive and interlaminar shear strengths respectively, as well as impact resistance is observed for composite coupons processed with lower cooling rates. Based on end-notch flexure (ENF) tests, the mode-II fracture toughness is also strongly dependent on the degree of crystallinity of the thermoplastic matrix, as lower cooling rates yield stronger interfacial bonds. In this way, the present study demonstrates that the mechanical properties of thermoplastic laminates can be optimized by taking into account the matrix cooling rate during processing cycle.

热塑性基体的结晶行为被认为是重要的性能，它可以极大地影响层压复合结构的机械和热性能。该手稿旨在评估通过热压成型加工的聚苯硫醚（PPS）/碳纤维层压板中不同程度的结晶度的影响。在本研究中，评估了加工后的层压板的形态，热和机械性能（压缩，层间剪切应力，冲击和端槽挠曲）。从获得的机械测试结果中，可以观察到在较低冷却速率下加工的复合材料试样的面内抗压强度和层间抗剪强度以及抗冲击性都有所提高。根据端部弯曲挠度（ENF）测试，II型断裂韧性也强烈取决于热塑性基质的结晶度，因为较低的冷却速率会产生更强的界面键合。这样，本研究表明，通过考虑加工周期中的基体冷却速率，可以优化热塑性层压板的机械性能。