[Characterization of surface properties of 1,3,5-triamino-2,4,6-trinitrobenzene by inverse gas chromatography].
The surface properties of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) with various particle sizes were characterized by inverse gas chromatography (IGC). The disperse component gamma s(d) of surface free energy of TATB samples increased as temperature increased. The larger the particle size is, the quicker the increasing rate of the disperse component will be as the temperature increases. The gamma s(d) of the coarse TATB is the highest (193.2 mJ/m2) and that of the submicron TATB is the smallest (64.0 mJ/m2) at 353 K. Due to the different preparation processes and particle sizes, the samples show obviously different Lewis acid-base properties. Fine TATB can provide positive Lewis acid-base active sites and has higher acidity. The specific components of the adsorption of polar probes on the surface of the other three types of TATB were found to be endothermic owing to the strong hydrogen bond of inter- and intra-TATB molecules. Their surface acidity and basicity constants, K(a) and K(b) are negative.
Nie
Fude
F
Department of Material Science, Fudan University, Shanghai 200433, China. zgh-nfd@sohu.com
Xu
Rong
R
Fan
Zhongyong
Z
Li
Yuesheng
Y