Okner Regina, Domb Abraham J, Mandler Daniel
Department of Medicinal Chemistry and Natural Products, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.
Biomacromolecules. 2007 Sep;8(9):2928-35. doi: 10.1021/bm7004752. Epub 2007 Aug 4.
Organic coatings based on N-(2-carboxyethyl)pyrrole (PPA) and a butyl ester of PPA (BuOPy) were deposited via electrochemical oxidation. The homo- and copolymers were electropolymerized on glassy carbon and stainless steel in acetonitrile using tetrabutylammonium tetrafluoraborate (Bu4NF4B) as the electrolyte. The mechanism of deposition on stainless steel was studied by chronoamperometry and by the tapping and phase angle imaging modes of atomic force microscopy. The electrochemical properties and growth of the films were investigated by cyclic voltammetry. The composition of the copolymers was determined by reflection-absorption Fourier transform infrared spectroscopy. We found that while the hydrophilic monomer PPA undergoes progressive nucleation followed by instantaneous growth the hydrophobic BuOPy nucleates instantaneously. The rate of BuOPy electropolymerization was higher than that of PPA, and the resulting film was thicker yet fluffier. Copolymer films were enriched by BuOPy as compared with the electropolymerization solution, which is attributed to the faster rate of electropolymerization of BuOPy than PPA.
基于N-(2-羧乙基)吡咯(PPA)和PPA的丁酯(BuOPy)的有机涂层通过电化学氧化沉积。使用四丁基四氟硼酸铵(Bu4NF4B)作为电解质，在乙腈中于玻碳和不锈钢上对均聚物和共聚物进行电聚合。通过计时电流法以及原子力显微镜的轻敲和相角成像模式研究了在不锈钢上的沉积机理。通过循环伏安法研究了薄膜的电化学性质和生长情况。通过反射吸收傅里叶变换红外光谱法测定共聚物的组成。我们发现，虽然亲水性单体PPA经历渐进成核然后瞬时生长，但疏水性BuOPy瞬间成核。BuOPy的电聚合速率高于PPA，并且所得薄膜更厚但更蓬松。与电聚合溶液相比，共聚物薄膜中BuOPy富集，这归因于BuOPy比PPA更快的电聚合速率。
