L. Mogas-Soldevila, Jorge Duro-Royo, Daniel Lizardo, George G. Hollyer, Charles M. Settens, Jordan M. Cox, J. Overvelde, Elaine DiMasi, Katia Bertoldi, James C. Weaver, N. Oxman
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引用次数: 1
摘要
由于需要利用可再生和可生物降解聚合物的特性来设计和制造具有复杂几何形状的多尺度结构,我们采用了增材制造平台,利用分子自组装来生产具有复杂几何形状和异质材料成分的米级结构。作为前体材料,我们使用了壳聚糖,它是甲壳素的一种化学修饰形式,是一种丰富且可持续的结构多糖。我们展示了通过结合基于挤压的机器人制造和定向工具路径,控制浓度依赖性结晶以及诱导聚合物链优先取向的能力。通过高分辨率微 X 射线衍射和有限元模拟,对各向异性进行了展示和评估。利用这种方法,我们可以利用受控和用户定义的小范围残余应力传播来诱导所产生结构的大范围折叠。
Driving macro-scale transformations in three-dimensional-printed biopolymers through controlled induction of molecular anisotropy at the nanoscale
Motivated by the need to harness the properties of renewable and biodegradable polymers for the design and manufacturing of multi-scale structures with complex geometries, we have employed our additive manufacturing platform that leverages molecular self-assembly for the production of metre-scale structures characterized by complex geometries and heterogeneous material composition. As a precursor material, we used chitosan, a chemically modified form of chitin, an abundant and sustainable structural polysaccharide. We demonstrate the ability to control concentration-dependent crystallization as well as the induction of the preferred orientation of the polymer chains through the combination of extrusion-based robotic fabrication and directional toolpathing. Anisotropy is demonstrated and assessed through high-resolution micro-X-ray diffraction in conjunction with finite element simulations. Using this approach, we can leverage controlled and user-defined small-scale propagation of residual stresses to induce large-scale folding of the resulting structures.
期刊介绍:
Each Interface Focus themed issue is devoted to a particular subject at the interface of the physical and life sciences. Formed of high-quality articles, they aim to facilitate cross-disciplinary research across this traditional divide by acting as a forum accessible to all. Topics may be newly emerging areas of research or dynamic aspects of more established fields. Organisers of each Interface Focus are strongly encouraged to contextualise the journal within their chosen subject.