Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, São Paulo, Brazil.
Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, São Paulo, Brazil.
Int J Biol Macromol. 2020 Nov 15;163:878-887. doi: 10.1016/j.ijbiomac.2020.07.064. Epub 2020 Jul 10.
Cellulose nanocrystals (CNCs), castor oil (CO), and recycled poly(ethylene terephthalate) (rPET), were used to add value to renewable raw materials and to a recycled polymer produced worldwide, producing mats composed of fibers on the nano- and submicrometric (ultrathin) scales through a sustainable process. Bio-based electrospun mats composed of aligned (rotary collector) and nonaligned (static collector) nanofibers/ultrathin fibers were produced from the electrospinning of solutions prepared from rPET (mixed with CO, CNCs, or CNCs/CO). The contact angle results showed that the CNC mat surfaces composed of nonaligned fibers were hydrophilic, and in contrast, these surfaces were hydrophobic when composed of aligned fibers. Among the mats composed of nonaligned fibers, PET/CO/CNC exhibited storage and Young's moduli approximately eleven and ten times, respectively, better than those of neat rPET. The PET/CO/CNC mat showed both modulus and tensile strength values higher than those of PET/CNC, when characterized in the preferential direction of fiber alignment. Electrospun mats were obtained from environmentally sound raw materials with diversified properties, which were modulated by the type of collector used, as well as whether CO and CNC were mixed with rPET, and have the potential for use in applications such as membrane separation processes and biomedical applications.
纤维素纳米晶体（CNC）、蓖麻油（CO）和回收的聚对苯二甲酸乙二醇酯（rPET）被用于为可再生原料和全球生产的回收聚合物增加价值，通过可持续的工艺生产出由纳米和亚微米（超薄片）纤维组成的纤维垫。由 rPET（与 CO、CNC 或 CNC/CO 混合）制备的溶液进行静电纺丝，生产出由取向（旋转收集器）和无规（静态收集器）纳米纤维/超薄片纤维组成的生物基电纺纤维垫。接触角结果表明，由无规纤维组成的 CNC 垫表面亲水，而由取向纤维组成的表面则疏水。在由无规纤维组成的纤维垫中，与纯 rPET 相比，PET/CO/CNC 的存储和杨氏模量分别提高了约 11 倍和 10 倍。当在纤维取向的优先方向进行表征时，与 PET/CNC 相比，PET/CO/CNC 纤维垫表现出更高的模量和拉伸强度值。这些电纺纤维垫是由环境友好型原材料制成，具有多样化的性能，可以通过使用的收集器类型、CO 和 CNC 是否与 rPET 混合来调节，具有在膜分离过程和生物医学应用等领域应用的潜力。
