Surface Characteristics of a Self-Polymerized Dopamine Coating Deposited on Hydrophobic Polymer Films
Surface Characteristics of a Self-Polymerized Dopamine Coating Deposited on Hydrophobic Polymer Films
复制标题
疏水性聚合物薄膜上沉积的自聚合多巴胺涂层的表面特性
DOI：
10.1021/la202877k
复制
发表时间：
2011-12-06
期刊：
影响因子：
3.9
通讯作者：
Xu, Youyi
中科院分区：
文献类型：
--
作者：
Jiang, Jinhong;Zhu, Liping;Xu, Youyi
本研究旨在探索聚多巴胺(PDA)涂层疏水聚合物薄膜的基本表面特性。利用聚偏氟乙烯(PVDF)薄膜的自聚合和附着力强的特点，在多巴胺水溶液中采用浸渍涂覆的方法对其进行表面改性。椭圆偏振光谱和扫描电子显微镜都表明，随着温度的升高，多巴胺在薄膜表面的自聚和沉积速率增加。用扫描电子显微镜、原子力显微镜和透射电子显微镜研究了PDA涂层薄膜表面形貌的变化以及溶液中PDA粒子的大小和形状。PDA修饰膜的表面粗糙度和表面自由能主要受反应温度的影响，与反应时间和多巴胺溶液浓度关系不大。此外，还对聚四氟乙烯(PTFE)、聚对苯二甲酸乙二酯(PET)和聚酰亚胺(PI)三种典型的疏水聚合物薄膜进行了同样的改性。与聚偏氟乙烯(PVDF)膜一样，聚偏氟乙烯(PVDF)膜经PDA包覆后，其表面自由能和冻干性(液体亲和力)显著提高。结果表明，PDA的沉积行为并不强烈地依赖于衬底的性质。这些信息不仅为我们更好地了解PDA涂层的生物激发表面化学提供了更好的理解，也为开发多巴胺的性质以创造新型功能聚合物材料提供了有效的策略。
This study aims to explore the fundamental surface characteristics of polydopamine (pDA)-coated hydrophobic polymer films. A poly(vinylidene fluoride) (PVDF) film was surface modified by dip coating in an aqueous solution of dopamine on the basis of its self-polymerization and strong adhesion feature. The self-polymerization and deposition rates of dopamine on film surfaces increased with increasing temperature as evaluated by both spectroscopic ellipsometry and scanning electronic microscopy (SEM). Changes in the surface morphologies of pDA-coated films as well as the size and shape of pDA particles in the solution were also investigated by SEM, atomic force microscopy (AFM), and transmission electron microscopy (TEM). The surface roughness and surface free energy of pDA-modified films were mainly affected by the reaction temperature and showed only a slight dependence on the reaction time and concentration of the dopamine solution. Additionally, three other typical hydrophobic polymer films of polytetrafluoroethylene (PTFE), poly(ethylene terephthalate) (PET), and polyimide (PI) were also modified by the same procedure. The lyophilicity (liquid affinity) and surface free energy of these polymer films were enhanced significantly after being coated with pDA, as were those of PVDF films. It is indicated that the deposition behavior of pDA is not strongly dependent on the nature of the substrates. This information provides us with not only a better understanding of biologically inspired surface chemistry for pDA coatings but also effective strategies for exploiting the properties of dopamine to create novel functional polymer materials.