Crolla J P, Britton M M, Espino D M, Thomas-Seale L E J
Dept. of Mechanical Engineering, University of Birmingham, Birmingham, B15 2TT UK.
School of Chemistry, University of Birmingham, Birmingham, B15 2TT UK.
MRS Adv. 2021;6(18):467-471. doi: 10.1557/s43580-021-00086-1. Epub 2021 Jun 22.
Poly(vinyl alcohol) cryogel (PVA) is a versatile biomaterial used to replicate the biomechanics of tissues. Additive manufacture (AM) at sub-zero (°C) temperatures enables the manufacture of PVA with complex geometry; however, the effect of processing parameters on the mechanical properties of PVA has not been evaluated. The aim of this study is to understand the impact of print nozzle diameter and orientation on the viscoelastic mechanical properties of PVA. Samples of sub-zero AM PVA, with different filament thicknesses, were tested under tension relative to the print direction, to calculate the storage and loss moduli. As the nozzle size was decreased, AM PVA exhibited more pronounced orthotropic properties; the smallest size showed a 33% decrease in storage moduli when tested perpendicular to the print direction, as opposed to parallel. This study has demonstrated the ability of sub-zero AM to tailor the orthotropic properties of PVA.
The online version contains supplementary material available at 10.1557/s43580-021-00086-1.
聚乙烯醇冷冻凝胶（PVA）是一种用于复制组织生物力学特性的多功能生物材料。在零下（°C）温度下进行增材制造（AM）能够制造出具有复杂几何形状的PVA；然而，加工参数对PVA力学性能的影响尚未得到评估。本研究的目的是了解打印喷嘴直径和方向对PVA粘弹性力学性能的影响。对具有不同细丝厚度的零下AM PVA样品，相对于打印方向进行拉伸测试，以计算储能模量和损耗模量。随着喷嘴尺寸减小，AM PVA表现出更明显的正交各向异性特性；最小尺寸的样品在垂直于打印方向测试时，储能模量相较于平行方向测试时下降了33%。本研究证明了零下AM能够定制PVA的正交各向异性特性。
网络版包含可在10.1557/s43580-021-00086-1获取的补充材料。
