以丙烯酰胺(AM)、 丙烯酰氧基乙基三甲基氯化铵(DAC)、 丙烯酸丁酯(BA)为单体, 采用紫外光引发聚合制备阳离子聚丙烯酰胺P(AM-DAC-BA)。 采用紫外光谱和红外光谱研究其结构特征; 分析AM, DAC, BA, P(AM-DAC-BA)的红外光谱中的典型红外振动频率的归属。 通过与单体红外光谱比较得出: 由于聚合产物的对称性增加, 聚合产物红外光谱更加简单。 P(AM-DAC-BA)的特性粘度随着光强、 BA含量、 光引发剂浓度、 光照时间的增加而增加。 选取AM, DAC, BA中的—CONH2, —COOCH2(CO), —COOCH2—(C—O—C), —CH2—N+(CH3)3基团吸收峰为特征吸收峰, 随着光强、 BA含量的增加, 特征峰面积增加; 随着光引发剂浓度增加特征峰面积却呈现减少趋势; 随着光照时间增加, 峰面积是先减小后增加。 但不同P(AM-DAC-BA)在红外光谱上对应的特征吸收峰的峰型类似, 特征峰位置基本一致。

Cationic Polyacrylamide P(AM-DAC-BA) was synthesized by UV initiation, with acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC), butyl acrylate (BA) as the monomers. P(AM-DAC-BA). UV spectroscopy and infrared spectroscopy were employed to study the structural characteristics. Attributions of typical infrared vibrational frequencies in AM/DAC/BA/P(AM-DAC-BA) were analysed. By comparing with infrared spectroscopy of the monomers, symmetrical characteristic of P(AM-DAC-BA) increasesd, and the infrared spectroscopy of polymerization product was simpler. The intrinsic viscosity increased with the increase in light intensity, BA content, photoinitiator concentration and illumination time. The groups of —CONH2, —COOCH2(CO), —COOCH2—(C—O—C), —CH2—N(CH3)3 group in AM, DAC, BA were selected as characteristic absorption peaks for studying. With the increase in light intensity and BA content, the characteristic peak areas increased. With the increase in photoinitiator concentration, the characteristic peak areas decreased. The characteristic peak areas decreased firstly and then increased with increasing the illumination time. But the corresponding characteristic IR absorption peaks of P(AM-DAC-BA) were similar, and the positions of characteristic peaks were basically the same.