挤压
流变学
自愈水凝胶
材料科学
粘弹性
海藻酸钙
3D打印
剪切减薄
流变仪
动态力学分析
化学工程
墨水池
复合材料
聚合物
高分子化学
钙
冶金
工程类
作者
Giovanni Falcone,Pierluigi Mazzei,Alessandro Piccolo,Tiziana Esposito,Teresa Mencherini,Rita Patrizia Aquino,P. Gaudio,Paola Russo
标识
DOI:10.1016/j.carbpol.2021.118746
摘要
With the aim to overcome alginate shape fidelity issue during the semisolid extrusion 3D printing and matrix collapsing after drying, we speculated that a pre-crosslinking step of the alginate ink-gel with low amount of Ca+2 could improve the hydrogel performance. To verify this, the influence of pre-crosslinker concentration (10-25 mM) on the ink gel rheological properties were studied and flow behaviour and viscoelastic properties were determined. The developed ink gels were fully characterised by DSC and Magnetic Resonance Imaging (MRI). Moreover, extrudability and the shape retention of extruded forms after printing and after drying were studied. The rheological and MRI data, combined with the morphological analysis of printed forms allowed us to identify the relationship between printability, shape retention and shear thinning behaviour of gels, showing good extrudability for all the pre-crosslinked gels with a calcium concentration between 0.15 and 0.25, corresponding to both egg-box dimers and multimers interactions.
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