Atifi Siham, Hamad Wadood Y
Transformation and Interfaces Group, Bioproducts Innovation Centre of Excellence, FPInnovations, 2665 East Mall, Vancouver, BC, V6T 1Z4, Canada.
Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.
Soft Matter. 2023 Sep 13;19(35):6700-6709. doi: 10.1039/d3sm00505d.
A systematic examination of the structure-property relations to create nanocomposite coatings electrophoretic deposition (EPD) of a cathodic polymer - for instance, polyacrylate - reinforced with cellulose nanocrystals (CNCs) is discussed in this work. EPD, a scalable and green technique, has also been used in our approach to polymerize dopamine in the presence of CNCs and cathodic polymer to improve adhesion properties. This study investigated the interactions between CNCs, polydopamine (PDA) and the cathodic polyacrylic polymer to elucidate the dispersion state of the nanoparticles in the system by carefully examining -potential, particle size, and electrophoretic mobility dependence in the colloidal suspension. We examined the morphology and structure of the electrodeposited nanocomposites using SEM and XPS, and the results indicate the formation of a compact, homogeneous structure. The incorporation of CNCs or PDA introduces different levels of roughness to the surface as revealed by AFM. Our results indicate improved adhesion, as determined by bond strength, using CNCs (>20%) or CNC-PDA (>30%) relative to the cathodic polymer, as well as significant improvement in hardness. The technique and materials used show promise to develop industrial organic coatings with low emissions for applications in automotive coatings and other applications.
本文讨论了一种用于制备纳米复合涂层的结构-性能关系的系统研究，即通过电泳沉积（EPD）法制备以纤维素纳米晶体（CNC）增强的阴极聚合物（如聚丙烯酸酯）。EPD是一种可扩展的绿色技术，在我们的方法中，还用于在CNC和阴极聚合物存在的情况下聚合多巴胺，以改善粘附性能。本研究通过仔细研究胶体悬浮液中的ζ电位、粒径和电泳迁移率依赖性，研究了CNC、聚多巴胺（PDA）和阴极聚丙烯酸聚合物之间的相互作用，以阐明纳米颗粒在体系中的分散状态。我们使用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）研究了电沉积纳米复合材料的形态和结构，结果表明形成了致密、均匀的结构。原子力显微镜（AFM）显示，加入CNC或PDA会使表面产生不同程度的粗糙度。我们的结果表明，相对于阴极聚合物，使用CNC（>20%）或CNC-PDA（>30%）时，通过粘结强度测定的粘附力得到改善，硬度也有显著提高。所使用的技术和材料有望开发出低排放的工业有机涂料，用于汽车涂料和其他应用。
