Additive manufacturing is a powerful tool to design materials with original properties. An innovative design of poly (Ethylene Vinyl Acetate) (EVA) containing 30 wt.-% of Aluminum TriHydroxide (ATH) was reported in a previous paper and liquids (water or potassium carbonate aqueous solution) were incorporated in the 3D printed structure. These multi-materials showing interesting properties, but stability, control and processing of these liquid-containing systems were an issue due to porosity of the polymeric matrix. To overcome this issue, the use of hydrogels is considered in this study: being either solid or highly viscous, hydrogels can retain water in the design, despite the high porosity of the EVA/ATH matrix. In this paper, the liquid phase was substituted by flame retardant hydrogels (based on agar, alginate or poly (vinyl alcohol) - PVA), containing in particular vermiculite platelets and for the hydrogel based on alginate, K₂CO₃ as flame retardant fillers. Excellent behavior under a 50 kW/m² heat flux during a cone calorimeter test was obtained, with fast extinguishment of the flame and a low peak of Heat Release Rate (pHRR) and Total Heat Release (THR). The physical barrier formed by vermiculite platelets during the test, as well as the condensed phase mechanism of K₂CO₃ were found to be responsible for these excellent results, as found by confocal microscopy observations, electron probe micro analysis and X-Ray diffraction experiments.

增材制造是设计具有原始属性的材料的有力工具。在先前的论文中报道了含有30％（重量）三氢氧化铝（ATH）的聚（乙烯乙酸乙烯酯）（EVA）的创新设计，并将液体（水或碳酸钾水溶液）掺入了3D打印结构中。这些多材料显示出令人感兴趣的特性，但是由于聚合物基质的孔隙率，这些含液体体系的稳定性，控制和加工成为一个问题。为了克服这个问题，在这项研究中考虑使用水凝胶：无论是固体还是高粘度，水凝胶都可以在设计中保留水分，尽管EVA / ATH基质的孔隙率很高。在本文中，液相被阻燃水凝胶（基于琼脂，藻酸盐或聚乙烯醇-PVA）取代，₂ CO ₃作为阻燃填料。在锥形量热仪测试中，在50 kW / m ^2的热通量下获得了优异的性能，火焰快速熄灭，并且放热率（pHRR）和总放热（THR）的峰值较低。共焦显微镜观察，电子探针显微分析和X射线衍射实验发现，ver石薄片在测试过程中形成的物理屏障以及K ₂ CO ₃的凝聚相机理是造成这些优异结果的原因。 。