Pro(2)TecS - Chemical Product and Process Technology Research Center, Department of Chemical Engineering and Materials Science, Universidad de Huelva, ETSI, Campus de "El Carmen", 21071 Huelva, Spain.
Pro(2)TecS - Chemical Product and Process Technology Research Center, Department of Chemical Engineering and Materials Science, Universidad de Huelva, ETSI, Campus de "El Carmen", 21071 Huelva, Spain.
Int J Biol Macromol. 2021 Jun 1;180:212-221. doi: 10.1016/j.ijbiomac.2021.03.069. Epub 2021 Mar 16.
This work explores the electrospinnability of low-sulfonate Kraft lignin (LSL)/polyvinylpyrrolidone (PVP) solutions in N,N-dimethylformamide (DMF) and the ability of the different micro- and nano-architectures generated to structure castor oil. LSL/PVP solutions were prepared at different concentrations (8-15 wt%) and LSL:PVP ratios (90:10-0:100) and physico-chemically and rheologically characterized. The morphology of electrospun nanostructures mainly depends on the rheological properties of the solution. Electrosprayed nanoparticles or micro-sized particles connected by thin filaments were obtained from solutions with low LSL/PVP concentrations and/or high LSL:PVP ratios, whereas beaded or bead-free nanofibers were produced by increasing concentration and/or decreasing LSL:PVP ratio, due to enhanced extensional viscoelastic properties and non-Newtonian characteristics. Electrospun LSL/PVP nanofibers are able to form oleogels by simply dispersing them into castor oil at concentrations between 10 and 30 wt%. The rheological properties of the oleogels may be tailored by modifying the LSL:PVP ratio and nanofibers content. The potential application of these oleogels as bio-based lubricants was also explored in a tribological cell. Satisfactory friction and wear results are achieved when using oleogels structured by nanofibers mats with enhanced gel-like properties as lubricants. Overall, electrospinning of lignin/PVP solutions can be proposed as a simple and effective method to produce nanofibers for oil structuring.
这项工作探讨了低磺化硫酸盐木质素 (LSL)/聚乙烯吡咯烷酮 (PVP) 在 N,N-二甲基甲酰胺 (DMF) 中的可纺性，以及所生成的不同微观和纳米结构的能力，以结构化蓖麻油。LSL/PVP 溶液按不同浓度（8-15wt%）和 LSL:PVP 比例（90:10-0:100）制备，并进行物理化学和流变学特性分析。电纺纳米结构的形态主要取决于溶液的流变性能。从低 LSL/PVP 浓度和/或高 LSL:PVP 比例的溶液中获得电喷纳米粒子或由细纤维连接的微尺寸粒子，而通过增加浓度和/或降低 LSL:PVP 比例，由于增强了拉伸粘弹性和非牛顿特性，得到了珠状或无珠状的纳米纤维。LSL/PVP 纳米纤维在浓度为 10-30wt% 时可以简单地分散到蓖麻油中形成油凝胶。通过改变 LSL:PVP 比例和纳米纤维含量，可以调整油凝胶的流变性能。还在摩擦学单元中探索了这些油凝胶作为生物基润滑剂的潜在应用。当使用具有增强凝胶状特性的纳米纤维垫结构化的油凝胶作为润滑剂时，可以获得令人满意的摩擦和磨损结果。总体而言，木质素/PVP 溶液的静电纺丝可以作为一种简单有效的方法来生产用于油结构化的纳米纤维。
