用于耐腐蚀3D打印应用的稳健表面工程流延成型和挤出方法，以制造导电聚偏二氟乙烯/碳纳米管长丝

Robust Surface-Engineered Tape-Cast and Extrusion Methods to Fabricate Electrically-Conductive Poly(vinylidene fluoride)/Carbon Nanotube Filaments for Corrosion-Resistant 3D Printing Applications.

作者信息

Almazrouei Asma, Susantyoko Rahmat Agung, Wu Chieh-Han, Mustafa Ibrahim, Alhammadi Ayoob, Almheiri Saif

机构信息

Engineering Systems and Management, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates.

Department of Mechanical Engineering, Khalifa University of Science and Technology, Masdar Institute, Masdar City, P.O. Box 54224, Abu Dhabi, United Arab Emirates.

出版信息

Sci Rep. 2019 Jul 3;9(1):9618. doi: 10.1038/s41598-019-45992-5.

DOI:10.1038/s41598-019-45992-5

PMID:31270344

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6610098/

Abstract

We developed a poly(vinylidene fluoride)/carbon nanotube (PVDF-MWCNT) filament as a feed for printing of electrically-conductive and corrosion-resistant functional material by fused filament fabrication (FFF). Using an environment-friendly procedure to fabricate PVDF-MWCNT filament, we achieved the best reported electrical conductivity of printable PVDF-MWCNT filament of 28.5 S cm (90 wt% PVDF and 10 wt% CNT). The PVDF-MWCNT filaments are chemically stable in acid, base, and salt solution, with no significant changes in electrical conductivity and mass of the filaments. Our processing method is robust and allow a uniform mixture of PVDF and CNT with a wide range of CNT percentage up to 99.9%. We demonstrated the printing of PVDF-MWCNT filaments to create 3D shapes; printed using a low-cost commercial consumer-grade FFF 3D printer. We found many adjustments of printer parameters are needed to print filament with CNT content >10 wt%, but easier printing for CNT content ≤10 wt%. Since this was due to printer limitation, we believed that PVDF-MWCNT with higher CNT percentage (to a certain limit) and larger electrical conductivity could be printed with a custom-built printer (for example stronger motor). PVDF-MWCNT filament shows higher electrical conductivity (28.5 S cm) than compressed composite (8.8 S cm) of the same 10 wt% of CNT, due to more alignment of CNT in the longitudinal direction of the extruded filament. Printable PVDF-MWCNT-FeO (with a functional additive of FeO) showed higher electrical conductivity in the longitudinal direction at the filament core (42 S cm) compared to that in the longitudinal direction at the filament shell (0.43 S cm) for sample with composition of 60 wt% PVDF, 20 wt% CNT, and 20 wt% FeO, due to extrusion skin effect with segregation of electrically insulating FeO at the shell surface of PVDF-MWCNT-FeO.

摘要

我们开发了一种聚偏二氟乙烯/碳纳米管（PVDF-MWCNT）长丝，作为通过熔融长丝制造（FFF）打印导电且耐腐蚀功能材料的原料。通过采用一种环境友好的方法来制造PVDF-MWCNT长丝，我们实现了可打印PVDF-MWCNT长丝目前报道的最佳电导率，为28.5 S cm（90 wt% PVDF和10 wt% CNT）。PVDF-MWCNT长丝在酸、碱和盐溶液中化学稳定，长丝的电导率和质量无显著变化。我们的加工方法稳健，能使PVDF和CNT均匀混合，CNT百分比范围高达99.9%。我们展示了用PVDF-MWCNT长丝打印以创建3D形状；使用低成本的商用消费级FFF 3D打印机进行打印。我们发现，要打印CNT含量>10 wt%的长丝，需要对打印机参数进行许多调整，但打印CNT含量≤10 wt%的长丝则更容易。由于这是打印机的限制，我们认为使用定制打印机（例如更强的电机）可以打印具有更高CNT百分比（到一定限度）和更大电导率的PVDF-MWCNT。PVDF-MWCNT长丝的电导率（28.5 S cm）高于相同10 wt% CNT的压缩复合材料（8.8 S cm），这是因为CNT在挤出长丝的纵向排列更整齐。对于由60 wt% PVDF、20 wt% CNT和20 wt% FeO组成的样品，可打印的PVDF-MWCNT-FeO（添加了功能性添加剂FeO）在长丝芯部纵向的电导率（42 S cm）高于在长丝壳部纵向的电导率（0.43 S cm），这是由于PVDF-MWCNT-FeO存在挤出皮层效应，电绝缘的FeO在壳表面偏析。