Chen Qi, Wang Na, Kuzhandaivel Dhandapani, Chen Yingxian, Wu Lixin, Zheng Longhui
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Polymers (Basel). 2025 Mar 20;17(6):824. doi: 10.3390/polym17060824.
Wear resistance is the key factor that affects the long-term use of leather. Graphene has excellent wear resistance properties, but ensuring the effective dispersion of graphene in resin is crucial for determining the performance of the material. In this work, silica modified with polydopamine (SiO@PDA) was used as an exfoliation agent. Using the microfluidization process and water as the medium, silica-graphene hybrid nanoparticles (SiO@PDA-G) were prepared from expanded graphite. These nanoparticles were further compounded with waterborne polyurethane (WPU), and a superfine fiber-based fabric was used as the substrate to prepare composite coating. The results showed that the high shear force of the microfluidization process easily broke up the lamellar structure of graphite, resulting in few-layer graphene. Nano-silica was adsorbed on the surface of graphene, preventing re-aggregation between the graphene sheets. Compared to the WPU coating, the presence of SiO@PDA-G improved the wear resistance and mechanical properties of the coating. The wear rate and the average friction coefficient of the composite coating decreased by 48% and 69%, respectively, and the tensile strength increased by 83%. Therefore, this study provides a new strategy for improving the dispersion of graphene in polymer materials and enhancing the abrasion resistance of the coatings.
耐磨性是影响皮革长期使用的关键因素。石墨烯具有优异的耐磨性能，但确保石墨烯在树脂中的有效分散对于决定材料性能至关重要。在这项工作中，用聚多巴胺改性的二氧化硅（SiO@PDA）用作剥离剂。以水为介质，利用微流化工艺由膨胀石墨制备了二氧化硅-石墨烯复合纳米粒子（SiO@PDA-G）。将这些纳米粒子进一步与水性聚氨酯（WPU）复合，并以超细纤维基织物为基材制备复合涂层。结果表明，微流化工艺的高剪切力容易破坏石墨的层状结构，从而得到少层石墨烯。纳米二氧化硅吸附在石墨烯表面，防止石墨烯片层之间重新聚集。与WPU涂层相比，SiO@PDA-G的存在提高了涂层的耐磨性和力学性能。复合涂层的磨损率和平均摩擦系数分别降低了48%和69%，拉伸强度提高了83%。因此，本研究为改善石墨烯在聚合物材料中的分散性和提高涂层的耐磨性提供了一种新策略。
