A Printing‐Centric Approach to the Electrostatic Modification of Polymer/Clay Composites for Use in 3D Direct‐Ink Writing,Advanced Materials Interfaces

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A Printing‐Centric Approach to the Electrostatic Modification of Polymer/Clay Composites for Use in 3D Direct‐Ink Writing
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-02-12 , DOI: 10.1002/admi.201701579
Brittany M. Rauzan ₁ , Sean E. Lehman ₁ , Joselle M. McCracken ₁ , Jonghun Lee ₂ , Xiao-Min Lin ₃ , Alec Sandy ₂ , Suresh Narayanan ₂ , Simon A. Rogers ₄ , Ralph G. Nuzzo ₁

Affiliation

Polymer/clay composite inks are exceptionally useful materials for fabrication processes based on 3D direct‐ink writing, however, there remains an insufficient understanding of how their physiochemical dynamics impact printability. Using a model system, N‐isopropylacrylamide/Laponite, the electrostatic interactions between Laponite platelets are modified to tune critical rheological properties in order to improve printability. Rheological measurements and X‐ray scattering experiments are carried out to monitor the nano/micro‐structural dynamics and complex physicochemical interactions of Laponite as it impacts complex modulus in the linear region, flow behavior, thixotropy, and yield stress of the composite ink. Modification of the electrostatic interactions between platelets reduces the yield stress of the material, while maintaining a complex microstructure that allows for sufficient recovery times upon removal of stress to form stable, and thus printable, filaments. A printing‐centric approach is established based on a fundamental understanding of electrostatic inter‐particle interactions, harnessing the innate microstructure of Laponite in 3D direct‐ink writing of composites.

中文翻译：

用于3D直接墨水书写的聚合物/粘土复合材料静电改性的以印刷为中心的方法

聚合物/粘土复合油墨是用于基于3D直接油墨书写的制造过程中非常有用的材料，但是，对其理化动力学如何影响可印刷性仍缺乏足够的了解。使用模型系统，N-异丙基丙烯酰胺/ Laponite，Laponite血小板之间的静电相互作用经过修饰，可调节关键的流变性能，从而改善可印刷性。进行流变学测量和X射线散射实验以监测Laponite的纳米/微观结构动力学和复杂的理化相互作用，因为它会影响复合油墨的线性区域中的复数模量，流动行为，触变性和屈服应力。血小板之间的静电相互作用的改变降低了材料的屈服应力，同时保持了复杂的微观结构，该微观结构允许在消除应力时具有足够的恢复时间以形成稳定的并因此可印刷的细丝。基于对静电粒子间相互作用的基本理解，建立了以印刷为中心的方法，

更新日期：2018-02-12

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