3D printing of multicomponent materials as an advantageous method over traditional mold casting methods is demonstrated, developing small core–shell capsule composites fabricated by a two‐step 3D printing process. Using a two‐print‐head system (fused deposition modeling extruder and a liquid inkjet print head), micro‐sized capsules are manufactured in sizes ranging from 100 to 800 µm. The thermoplastic polymer poly(ε‐caprolactone) (PCL) is chosen as matrix/shell material due to its optimal interaction with the embedded hydrophobic liquids. First, the core–shell capsules are printed with model liquids and pure PCL to optimize the printing parameters and to ensure fully enclosed capsules inside the polymer. As a proof of concept, novel “click” reaction systems, used in self‐healing and stress‐detection applications, are manufactured in which PCL composites with nano‐ and micro‐fillers are combined with reactive, encapsulated liquids. The so generated 3D printed core–shell capsule composite can be used for post‐printing reactions and damage sensing when combined with a fluorogenic dye.

中文翻译：

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核-壳胶囊复合材料的3D打印，用于后反应和损伤感应应用

演示了多组分材料的3D打印作为传统铸模方法的一种有利方法，它开发了通过两步3D打印工艺制造的小型核壳复合材料。使用双打印头系统（熔融沉积建模挤出机和液体喷墨打印头），可以制造尺寸从100至800 µm的微型胶囊。选择热塑性聚合物聚（ε-己内酯）（PCL）作为基质/壳材料，是因为其与嵌入的疏水性液体具有最佳的相互作用。首先，用模型液体和纯PCL印刷核壳胶囊，以优化印刷参数并确保将胶囊完全封闭在聚合物中。作为概念验证，用于自我修复和压力检测应用的新型“点击”反应系统 制造过程中，将具有纳米和微填料的PCL复合材料与反应性，封装的液体结合在一起。如此生成的3D打印核壳胶囊复合材料与荧光染料结合使用时，可用于印刷后反应和损伤感测。