Grause Guido, Furusawa Masaaki, Okuwaki Akitsugu, Yoshioka Toshiaki
Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku Sendai 980-8579, Japan.
Chemosphere. 2008 Mar;71(5):872-8. doi: 10.1016/j.chemosphere.2007.11.033. Epub 2007 Dec 26.
Tetrabromobisphenol-A (TBBA) is the most common brominated fire retardant. In this study, a TBBA containing paper laminated printed circuit board (PCB) prepared from novolac was pyrolysed by both TGA and in a quartz glass reactor between 40 and 1,000 degrees C. The products were online detected by MS. It was found that the PCB degraded in three steps. Step one (<270 degrees C) consisted of the evolution of water and CO(2) from the paper laminate. In the second step, between 270 and 370 degrees C, the fire retardant decomposed, releasing HBr and brominated aromatics. In the third step, at temperatures above 370 degrees C, the phenol resin decomposed and char was formed. Compared to pure TBBA, which mainly produces brominated phenols, the brominated products enclosed in the char released HBr during the last degradation step as well as during the second step. Most of the bromine left the resin in the form of HBr, with about 14% of the bromine being fixed in brominated aromatics and less than 2% remaining in the residue.
四溴双酚 A（TBBA）是最常见的溴化阻燃剂。在本研究中，由酚醛清漆制备的含 TBBA 的纸质层压印刷电路板（PCB）在热重分析仪（TGA）以及石英玻璃反应器中于 40 至 1000 摄氏度下进行热解。产物通过质谱仪（MS）在线检测。结果发现，该印刷电路板分三步降解。第一步（<270 摄氏度）是纸质层压板中的水和二氧化碳逸出。第二步，在 270 至 370 摄氏度之间，阻燃剂分解，释放出溴化氢（HBr）和溴化芳烃。第三步，在温度高于 370 摄氏度时，酚醛树脂分解并形成炭。与主要产生溴化酚的纯 TBBA 相比，炭中所含的溴化产物在最后降解步骤以及第二步中都会释放出 HBr。大部分溴以 HBr 的形式离开树脂，约 14%的溴固定在溴化芳烃中，不到 2%的溴残留在残渣中。
