García-Mayorga Juan Carlos, Rosu Haret-Codratian, Jasso-Salcedo Alma Berenice, Escobar-Barrios Vladimir Alonso
Advanced Materials Department, Instituto Potosino de Investigación Científica y Tecnológica A.C. Camino a la Presa San José, Lomas 4a Sección San Luis Potosí SLP 78216 Mexico
Departamento de Biociencias y Agrotecnología, Centro de Investigación en Química Aplicada Blvd. Enrique Reyna Hermosillo No. 140 Saltillo Coahuila 25294 Mexico.
RSC Adv. 2023 Feb 9;13(8):5081-5095. doi: 10.1039/d2ra06669f. eCollection 2023 Feb 6.
The synthesis and characterization of polydopamine (PDA) using dopamine (DA) as the monomer and (hydroxymethyl)aminomethane (TRIS) as the oxidant is studied. The effect of temperature and TRIS concentration on the kinetics of dopamine polymerization is evaluated, and the kinetic parameters are also calculated. Three TRIS concentrations are used to assess their effect on DA polymerization kinetics. The reaction at 1.5 mmol of TRIS shows a sustained increase of the rate constant with temperature from 2.38 × 10 to 5.10 × 10 when the temperature is increased from 25 to 55 °C; however, not all reactions follow an Arrhenius law. In addition, the correlation between the synthesis parameters and morphological, structural, and thermal properties of polydopamine is established. The morphology of the PDA particles is evaluated by Scanning Electron Microscopy (SEM), the relationships between the diameter, distribution size, and the rate constant. Thermal characterization by Differential Scanning Calorimetry (DSC) shows an endothermic transition around 130 °C associated with the melting of PDA's regular structure. It is supported by structural studies, such as infrared and Raman spectroscopy and X-ray Diffraction (XRD), by observing a broad peak at 23.1° (2) that fits with a graphitic-like structure of PDA.
研究了以多巴胺（DA）为单体、（羟甲基）氨基甲烷（TRIS）为氧化剂合成聚多巴胺（PDA）及其表征。评估了温度和TRIS浓度对多巴胺聚合动力学的影响，并计算了动力学参数。使用三种TRIS浓度来评估它们对DA聚合动力学的影响。当温度从25℃升高到55℃时，1.5 mmol的TRIS参与的反应显示速率常数随温度持续增加，从2.38×10增加到5.10×10；然而，并非所有反应都遵循阿仑尼乌斯定律。此外，还建立了聚多巴胺的合成参数与形态、结构和热性能之间的相关性。通过扫描电子显微镜（SEM）评估PDA颗粒的形态，研究直径、分布尺寸与速率常数之间的关系。差示扫描量热法（DSC）的热表征显示在130℃左右有一个吸热转变，这与PDA规则结构的熔化有关。红外和拉曼光谱以及X射线衍射（XRD）等结构研究通过观察在23.1°（2）处的一个宽峰来支持这一结果，该峰与PDA的类石墨结构相符。
