Poly(amidoamine) (PAMAM) dendrimers with different generations (G = 2, 3 and 4) were synthesized, peripherally modified with aniline pentamers and studied for their redox and dopable behavior under different pH conditions. It was found that the electron transition of the πB–πQ band red-shifted and the size of PAMAM G2 decreased in an alkaline medium. The chemical oxidation process and the color change of these modified dendritic macromolecules were measured by cyclic voltammetry (CV) and electrochromism. All of the dendrimers showed three redox peaks in the CV. The current density of the voltammograms increased with increasing the number of aniline pentamer segments at the periphery. A drastic color change was observed when a linear potential sweep was applied. The thermal properties of the electroactive dendrimers were evaluated by differential scanning calorimetry and thermogravimetric analysis.
合成了不同代(G = 2、3 和 4)的聚酰胺胺 (PAMAM) 树枝状聚合物,用
苯胺五聚体进行外围修饰,并研究了它们在不同 pH 条件下的氧化还原和掺杂行为。研究发现,在碱性介质中,πB–πQ 能带的电子跃迁发生红移,PAMAM G2 的尺寸减小。通过循环伏安法(CV)和电致变色测量这些改性树枝状大分子的
化学氧化过程和颜色变化。所有树枝状聚合物在 CV 中均显示出三个氧化还原峰。伏安图的电流密度随着外围
苯胺五聚体片段数量的增加而增加。当施加线性电位扫描时,观察到剧烈的颜色变化。通过差示扫描量热法和热重分析评估了电活性树枝状聚合物的热性能。