Cheng Christine, Gupta Malancha
Mork Family Department of Chemical Engineering and Material Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089, USA.
Beilstein J Nanotechnol. 2017 Aug 8;8:1629-1636. doi: 10.3762/bjnano.8.162. eCollection 2017.
3D printing is a useful fabrication technique because it offers design flexibility and rapid prototyping. The ability to functionalize the surfaces of 3D-printed objects allows the bulk properties, such as material strength or printability, to be chosen separately from surface properties, which is critical to expanding the breadth of 3D printing applications. In this work, we studied the ability of the initiated chemical vapor deposition (iCVD) process to coat 3D-printed shapes composed of poly(lactic acid) and acrylonitrile butadiene styrene. The thermally insulating properties of 3D-printed plastics pose a challenge to the iCVD process due to large thermal gradients along the structures during processing. In this study, processing parameters such as the substrate temperature and the filament temperature were systematically varied to understand how these parameters affect the uniformity of the coatings along the 3D-printed objects. The 3D-printed objects were coated with both hydrophobic and hydrophilic polymers. Contact angle goniometry and X-ray photoelectron spectroscopy were used to characterize the functionalized surfaces. Our results can enable the use of iCVD to functionalize 3D-printed materials for a range of applications such as tissue scaffolds and microfluidics.
3D打印是一种有用的制造技术，因为它提供了设计灵活性和快速原型制作。对3D打印物体表面进行功能化处理的能力，使得诸如材料强度或可打印性等整体属性能够与表面属性分开选择，这对于扩大3D打印应用的广度至关重要。在这项工作中，我们研究了引发化学气相沉积（iCVD）工艺对由聚乳酸和丙烯腈-丁二烯-苯乙烯制成的3D打印形状进行涂层处理的能力。3D打印塑料的隔热性能对iCVD工艺构成了挑战，因为在加工过程中沿着结构会存在较大的热梯度。在本研究中，系统地改变了诸如基底温度和细丝温度等加工参数，以了解这些参数如何影响沿着3D打印物体的涂层均匀性。3D打印物体用疏水性和亲水性聚合物进行了涂层处理。使用接触角测量法和X射线光电子能谱对功能化表面进行了表征。我们的结果能够使iCVD用于对3D打印材料进行功能化处理，以用于一系列应用，如组织支架和微流体。
