Borrego María, Kuhn Erik, Martín-Alfonso José E, Franco José M
Chemical Product and Process Technology Research Center (Pro2TecS), Department Chemical Engineering and Materials Science, Escuela Técnica Superior de Ingeniería (ETSI), Campus de "El Carmen", University of Huelva, 21071 Huelva, Spain.
Laboratory of Machine Elements and Tribology, Department of Mechanical Engineering and Production, Faculty of Engineering Technology and Computer Science, Hamburg University of Applied Sciences (HAW-Hamburg), Berliner Tor 21, 20099 Hamburg, Germany.
Nanomaterials (Basel). 2023 Oct 27;13(21):2852. doi: 10.3390/nano13212852.
The tribological performance of novel bio-based lubricating greases thickened with electrospun lignin nanostructures was investigated in a nanotribometer using a steel-steel ball-on-disc configuration. The impact of electrospun nanofibrous network morphology on friction and wear is explored in this work. Different lignin nanostructures were obtained with electrospinning using ethylcellulose or PVP as co-spinning polymers and subsequently used as thickeners in castor oil at concentrations of 10-30% wt. Friction and wear generally increased with thickener concentration. However, friction and wear decreased when using homogeneous bead-free nanofiber mats (with higher fiber diameter and lower porosity) rather than nanostructures dominated by the presence of particles or beaded fibers, which was favored by reducing the lignin:co-spinning polymer ratio.
采用钢-钢球盘配置，在纳米摩擦计中研究了用静电纺丝木质素纳米结构增稠的新型生物基润滑脂的摩擦学性能。本工作探讨了静电纺纳米纤维网络形态对摩擦和磨损的影响。使用乙基纤维素或聚乙烯吡咯烷酮作为共纺聚合物，通过静电纺丝获得了不同的木质素纳米结构，随后将其作为增稠剂以10%-30% wt的浓度添加到蓖麻油中。摩擦和磨损通常随增稠剂浓度的增加而增加。然而，当使用均匀无珠纳米纤维垫（具有更高的纤维直径和更低的孔隙率）而非以颗粒或珠状纤维为主的纳米结构时，摩擦和磨损会降低，降低木质素与共纺聚合物的比例有利于形成这种结构。
