Invernizzi Marta, Natale Gabriele, Levi Marinella, Turri Stefano, Griffini Gianmarco
Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy.
Materials (Basel). 2016 Jul 16;9(7):583. doi: 10.3390/ma9070583.
Glass (GFR) and carbon fiber-reinforced (CFR) dual-cure polymer composites fabricated by UV-assisted three-dimensional (UV-3D) printing are presented. The resin material combines an acrylic-based photocurable resin with a low temperature (140 °C) thermally-curable resin system based on bisphenol A diglycidyl ether as base component, an aliphatic anhydride (hexahydro-4-methylphthalic anhydride) as hardener and (2,4,6,-tris(dimethylaminomethyl)phenol) as catalyst. A thorough rheological characterization of these formulations allowed us to define their 3D printability window. UV-3D printed macrostructures were successfully demonstrated, giving a clear indication of their potential use in real-life structural applications. Differential scanning calorimetry and dynamic mechanical analysis highlighted the good thermal stability and mechanical properties of the printed parts. In addition, uniaxial tensile tests were used to assess the fiber reinforcing effect on the UV-3D printed objects. Finally, an initial study was conducted on the use of a sizing treatment on carbon fibers to improve the fiber/matrix interfacial adhesion, giving preliminary indications on the potential of this approach to improve the mechanical properties of the 3D printed CFR components.
本文介绍了通过紫外光辅助三维（UV-3D）打印制备的玻璃纤维增强（GFR）和碳纤维增强（CFR）双固化聚合物复合材料。该树脂材料将丙烯酸基光固化树脂与一种低温（140°C）热固化树脂体系相结合，该热固化树脂体系以双酚A二缩水甘油醚为基础成分、脂环族酸酐（六氢-4-甲基邻苯二甲酸酐）为固化剂以及（2,4,6-三（二甲氨基甲基）苯酚）为催化剂。对这些配方进行全面的流变学表征，使我们能够确定它们的3D打印适性窗口。成功展示了UV-3D打印的宏观结构，清楚地表明了它们在实际结构应用中的潜在用途。差示扫描量热法和动态力学分析突出了打印部件良好的热稳定性和力学性能。此外，使用单轴拉伸试验来评估纤维对UV-3D打印物体的增强效果。最后，对碳纤维进行上浆处理以改善纤维/基体界面粘结力进行了初步研究，初步表明了这种方法改善3D打印CFR部件力学性能的潜力。
