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煤结构中存在的大量氢键对其化学结构和性质具有重要影响。为了研究煤在冲击破坏过程中氢键的变化。设计落锤循环冲击系统,实现对煤样的循环定量冲击。利用红外光谱仪进行光谱分析。研究得出东庞1/3焦煤主要的氢键类型是free OH groups,OH…π,OH…OH,cyclic OH tetramers和OH…N以及它们随冲击破坏的变化规律。在冲击力的作用下,煤体分子间氢键吸收强度变化非常明显,自由羟基也在冲击作用下发生机械力化学反应。对红外光谱进行高斯函数拟合分峰,发现各类氢键吸收强度随着冲能量的增加而减小,但其趋势在放缓。统计两者关系,得到各类氢键的光谱吸收强度与冲击能量的拟合方程,两者符合幂函数关系。对比拟合方程的幂指数,得出氢键在受冲击破坏时发生变化的敏感性顺序:free OH groups>cyclic OH tetramers>OH…N>OH…π>OH…OH。
The large number of hydrogen bonds present in coal structures have an important influence on their chemical structure and properties. In order to study the change of hydrogen bond in the process of impact destruction of coal. The design of drop hammer cycle impact system, to achieve a quantitative quantitative impact of coal samples. Spectral analysis using infrared spectroscopy. It is concluded that the main types of hydrogen bonds in Dong Pang 1/3 coking coal are free OH groups, OH ... π, OH ... OH, cyclic OH tetramers and OH ... N and their variation with impact damage. Under the action of impact force, the absorption intensity of hydrogen bond between coal molecules changes very obviously, and the free hydroxyl group also undergoes the mechanochemical reaction under the impact. Gaussian function fitting infrared spectrum peak, and found that the absorption intensity of various types of hydrogen bonds decreases with the increase of impulse energy, but the trend is slowing down. Statistics of the relationship between the two kinds of hydrogen bonds to obtain the spectral absorption intensity and impact energy fitting equation, both in line with the power function. By comparing the power exponents of the fitted equations, the sensitivity order of hydrogen bond changes upon impact damage is obtained: free OH groups> cyclic OH tetramers> OH ... N> OH ... π> OH ... OH.