双丙酮丙烯酰胺的紫外光谱研究

双丙酮丙烯酰胺（DAAM）是一种应用广泛的聚合物单体，可与其他乙烯基单体共聚得到性能各异的聚合物材料，而对DAAM的光谱研究报道较少。文章主要研究了DAAM在水、乙腈、甲醇和环己烷四种溶剂中的紫外光谱。结果发现，在这四种溶剂中，DAAM溶液的紫外光谱主要在200 nm左右及226 nm左右有2个强吸收峰。200 nm左右的吸收峰对溶剂的极性及溶液的浓度非常敏感。在极性溶剂中200 nm吸收峰发生蓝移，在极性较大的乙腈及水中，蓝移更大；在各种溶剂中，200 nm吸收峰都随溶液浓度增大而发生红移。而226 nm左右的吸收峰在各种极性不同的溶剂中吸收峰的位置变化不明显，对溶液浓度也不敏感。因此，DAAM在226 nm吸收峰可以用于DAAM的定量分析，而200 nm吸收峰可用于研究DAAM与其他分子的相互作用。另外，溶剂极性对2个吸收峰强度的影响也不相同。

Study on the Ultraviolet Spectra of Diacetone Acrylamide

Diacetone acrylamide(DAAM) is an important monomer which can be copolymerized with other monomers,so the copolymers with different properties can be obtained.In the present paper,the ultraviolet spectra of diacetone acrylamide solutions in four different solvents(water,acetonitrile,methanol,cyclohexane) were studied,and it was found that there were two strong absorption peaks around 200 nm and 226 nm,respectively.The absorption peak around 200 nm was sensitive to the polarity of the solvent.The absorption shifted to the lower wavelength as the polarity of the solvent was increased,especially in water and acetonitrile.And the adsorption shifted to longer wavelength with the increase in the concentration. However,the other absorption peak at 226 nm remained basically stable when the concentration or the polarity of the solvent was changed.Obviously the absorption at 226 nm is reasonably considered as a characteristic peak of DAAM in the ultraviolet quantitative analysis.And the other absorption peak at 200 nm which is sensitive to the solvent and concentration can be taken to study the interactions between DAAM and solvent molecules.Also,the strength of the adsorption was affected by the polarity of the solvent.