Ibrahim Fathirrahman, Mohan Denesh, Sajab Mohd Shaiful, Bakarudin Saiful Bahari, Kaco Hatika
Research Center for Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Chemical Engineering Programme, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Polymers (Basel). 2019 Sep 23;11(10):1544. doi: 10.3390/polym11101544.
In this study, lignin has been extracted from oil palm empty fruit bunch (EFB) fibers via an organosolv process. The organosolv lignin obtained was defined by the presence of hydroxyl-containing molecules, such as guaiacyl and syringyl, and by the presence of phenolic molecules in lignin. Subsequently, the extracted organosolv lignin and graphene nanoplatelets (GNP) were utilized as filler and reinforcement in photo-curable polyurethane (PU), which is used in stereolithography 3D printing. The compatibility as well as the characteristic and structural changes of the composite were identified through the mechanical properties of the 3D-printed composites. Furthermore, the tensile strength of the composited lignin and graphene shows significant improvement as high as 27%. The hardness of the photo-curable PU composites measured by nanoindentation exhibited an enormous improvement for 0.6% of lignin-graphene at 92.49 MPa with 238% increment when compared with unmodified PU.
在本研究中，通过有机溶剂法从油棕空果串（EFB）纤维中提取了木质素。所获得的有机溶剂木质素由含羟基分子（如愈创木基和紫丁香基）的存在以及木质素中酚类分子的存在来定义。随后，将提取的有机溶剂木质素和石墨烯纳米片（GNP）用作光固化聚氨酯（PU）中的填料和增强剂，该光固化聚氨酯用于立体光刻3D打印。通过3D打印复合材料的力学性能确定了复合材料的相容性以及特性和结构变化。此外，复合木质素和石墨烯的拉伸强度显著提高，高达27%。通过纳米压痕测量的光固化PU复合材料的硬度，对于0.6%的木质素-石墨烯，在92.49MPa时表现出巨大的改善，与未改性的PU相比增加了238%。
