Abstract This paper proposes an ultraviolet (UV)-assisted fused deposition modeling (FDM) method with a dual-curing process for fabricating continuous fiber-reinforced thermosetting polymer composites (CFRTPCs). The entire approach is based on the additive deposition of fused continuous glass fiber (CGF)/epoxy (EP) filaments, which are rapidly cooled upon exiting the printer nozzle to form a solid three-dimensional (3D) object. At the same time, UV irradiation is used to activate the photoinitiator and photosensitizer to pre-cure the extruded material. The final polymerization and crosslinking reactions are achieved using a post heat treatment. Herein, the UV absorption characteristics and post heating process of the dual-cure EP matrix were investigated to demonstrate the feasibility and generality of the proposed technique. Finally, 3D printed CGF/EP samples with a 43 ± 3 wt% fiber content exhibited a tensile strength and tensile modulus of 272.51 ± 5.12 MPa and 8.01 ± 0.45 GPa, respectively; flexural strength and flexural modulus of 299.36 ± 6.16 MPa and 8.35 ± 0.18 GPa, respectively; and interlaminar shear strength of 34.06 ± 0.83 MPa. The combination of UV irradiation and post heat treatment offers a rapid, feasible, and effective dual-cure solution for 3D printing of CFRTPCs, which could be a reliable fabrication method for the development of thermosetting composite systems used in various applications.

中文翻译：

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通过紫外辅助熔融沉积建模制备连续玻璃纤维增​​强双固化环氧树脂复合材料

摘要 本文提出了一种采用双固化工艺的紫外 (UV) 辅助熔融沉积建模 (FDM) 方法，用于制造连续纤维增强热固性聚合物复合材料 (CFRTPC)。整个方法基于熔融连续玻璃纤维 (CGF)/环氧树脂 (EP) 细丝的添加剂沉积，这些细丝在离开打印机喷嘴时会迅速冷却，以形成固体 3D (3D) 物体。同时，利用紫外线照射激活光引发剂和光敏剂，使挤出材料预固化。使用后热处理实现最终聚合和交联反应。在此，研究了双固化 EP 基质的紫外线吸收特性和后加热过程，以证明所提出技术的可行性和通用性。最后，具有 43 ± 3 wt% 纤维含量的 3D 打印 CGF/EP 样品的拉伸强度和拉伸模量分别为 272.51 ± 5.12 MPa 和 8.01 ± 0.45 GPa；弯曲强度和弯曲模量分别为 299.36 ± 6.16 MPa 和 8.35 ± 0.18 GPa；层间剪切强度为 34.06 ± 0.83 MPa。紫外线照射和后热处理的结合为 CFRTPC 的 3D 打印提供了一种快速、可行和有效的双固化解决方案，这可能是开发用于各种应用的热固性复合材料系统的可靠制造方法。层间剪切强度为 34.06 ± 0.83 MPa。紫外线照射和后热处理的结合为 CFRTPC 的 3D 打印提供了一种快速、可行且有效的双固化解决方案，这可能是开发用于各种应用的热固性复合材料系统的可靠制造方法。层间剪切强度为 34.06 ± 0.83 MPa。紫外线照射和后热处理的结合为 CFRTPC 的 3D 打印提供了一种快速、可行和有效的双固化解决方案，这可能是开发用于各种应用的热固性复合材料系统的可靠制造方法。