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本文合成了一系列的聚芳醚酮模型化合物,研究了它们在硫酸及氯仿(或氯仿加二甲亚砜)中的分子结构变化,实验结果表明,硫酸使其分子产生明显极化.在UV谱中,波长在400nm左右处出现新的吸收峰,~(13)C NMR谱中,碳基碳弛豫时间缩短,化学位移增加而与羰基相连的季碳弛豫时间与化学位移均减小.计算得到芳环平均两面角36°～39°,据此计算了不同极化模型的电荷运移,提出极化机理为桥键受硫酸质子化及偶极作用使芳环电荷离域.
In this paper, a series of poly (aryl ether ketone) model compounds were synthesized and their molecular structures in sulfuric acid and chloroform (or chloroform plus dimethylsulfoxide) were studied. The experimental results show that the molecules of the poly (aryl ether ketone) In the spectra, a new absorption peak appears at a wavelength of about 400 nm. In the ~ (13) C NMR spectrum, the carbon-based carbon relaxation time is shortened, the chemical shift is increased, and the quaternary carbon relaxation time and chemical shift associated with the carbonyl group are both decreased The average dihedral angle of the aromatic ring is calculated to be 36 ° ~ 39 °, and the charge transport of different polarization models is calculated. It is proposed that the bridge mechanism is bridged by sulfuric acid protonation and dipole action to delocalize the aromatic ring charge.