Kloster Jack T, Danley Matthew J, Lai Victor K, Zhao Ping
Advanced Materials Science, University of Minnesota-Duluth, Duluth, MN 55812, USA.
Department of Chemical Engineering, University of Minnesota-Duluth, Duluth, MN 55812, USA.
BME Front. 2023 Jul 7;4:0009. doi: 10.34133/bmef.0009. eCollection 2023.
: The objective of this work is to study the effects of porosity on mechanical and piezoelectric properties of polyvinylidene fluoride (PVDF) films for biomedical applications. By investigating the piezoelectric properties of PVDF and the porosity effect on its electromechanical performance, there is potential for further development of PVDF as a hemodynamic sensor that can lead to further technological advancements in the biomedical field, benefiting patients and physicians alike. : PVDF thin films have shown potential in the application of hemodynamic flow sensing and monitoring the effects on blood flow caused by prosthetic valve implantation via the transcatheter aortic valve replacement operation. The piezoelectric performance of PVDF films can be influenced by the porosity of the material. : In this study, strain tracking was performed on thin film PVDF specimens with various levels of porosity and pore sizes to determine the mechanical properties of the specimens. The mechanical properties were used to model the PVDF material in COMSOL multiphysics software, in which compression test simulations were performed to determine the piezoelectric coefficient of the PVDF. : A decline in the elastic modulus was found to be highly inversely correlated with porosity of the specimens and the simulation results show that elastic modulus had a much greater effect on the piezoelectric properties than Poisson's ratio. : A combination of experimental and computational techniques was able to characterize and correlate the mechanical properties of PVDF films of varying porosities to their piezoelectric properties.
这项工作的目的是研究孔隙率对用于生物医学应用的聚偏氟乙烯（PVDF）薄膜的力学和压电性能的影响。通过研究PVDF的压电性能及其机电性能的孔隙率效应，PVDF作为一种血流动力学传感器有进一步发展的潜力，这可以在生物医学领域带来进一步的技术进步，使患者和医生都受益。PVDF薄膜在血流动力学流量传感以及通过经导管主动脉瓣置换手术监测人工瓣膜植入对血流的影响方面已显示出潜力。PVDF薄膜的压电性能会受到材料孔隙率的影响。在本研究中，对具有不同孔隙率水平和孔径的PVDF薄膜试样进行了应变跟踪，以确定试样的力学性能。利用这些力学性能在COMSOL多物理场软件中对PVDF材料进行建模，在该软件中进行压缩试验模拟以确定PVDF的压电系数。发现弹性模量的下降与试样的孔隙率高度负相关，并且模拟结果表明弹性模量对压电性能的影响比泊松比大得多。实验和计算技术的结合能够表征不同孔隙率的PVDF薄膜的力学性能，并将其与压电性能相关联。
