Pol Vilas G, Shrestha Lok Kumar, Ariga Katsuhiko
School of Chemical Engineering, Purdue University , West Lafayette, Indiana 47907, United States.
ACS Appl Mater Interfaces. 2014 Jul 9;6(13):10649-55. doi: 10.1021/am502324m. Epub 2014 Jun 25.
In this article, the rapid synthesis of colloidal, spherical polymer resins via enhanced copolymerization and polycondensation of resorcinol with formaldehyde is presented. The ultrasound-mediated technique assembles perfectly spherical resins in less than 5 min due to generated active species and free radicals produced in an aqueous ammonia-ethanol-water solvent. In this report, numerous controlled experiments account for and support the important role of high intensity ultrasounds in the rapid cluster formation, condensation, and gelation process of resorcinol with formaldehyde in the presence of ammonia catalyst. After a controlled heat treatment process, amorphous carbon spheres are obtained from these spherical polymer resins. The effect of temperature (up to 1100 °C) on the structural evolution of these carbon spheres is meticulously studied which is lacking in the previous literature. The resorcinol-formaldehyde resins carbonized at 600 and 900 °C demonstrate BET surface areas of 592.4 m(2)/g and 952.5 m(2)/g with specific capacitances of 17.5, and 33.5 F/g (scan rate of 5 mV/s), respectively.
本文介绍了通过间苯二酚与甲醛的增强共聚和缩聚快速合成胶体球形聚合物树脂的方法。由于在氨-乙醇-水溶剂中产生的活性物种和自由基，超声介导技术在不到5分钟的时间内就能组装出完美的球形树脂。在本报告中，大量对照实验证明并支持了高强度超声在氨催化剂存在下间苯二酚与甲醛快速团簇形成、缩合和凝胶化过程中的重要作用。经过可控的热处理过程后，从这些球形聚合物树脂中获得了无定形碳球。细致研究了温度（高达1100°C）对这些碳球结构演变的影响，这在以前的文献中是缺乏的。在600°C和900°C碳化的间苯二酚-甲醛树脂的BET表面积分别为592.4 m²/g和952.5 m²/g，比电容分别为17.5和33.5 F/g（扫描速率为5 mV/s）。
