Abstract: Acetone and ethylene glycol compound, as a new photoinitiating system for the photo-polymerizing of acrylamide(AM) to polyacrylamide(PAM), was discussed. The UV spectrum of initiator system was measured. The influence of reaction conditions on polymerization was studied. UV absorbance of acetone and ethylene glycol compound wavelength ranges from 240 nm to 295 nm. The optimal polymerization condition was determined as follows：mass ratio of acetone to ethylene glycol 1∶1, the dosage of initiator 2 mL/L, the mass content of monomer 30%～35%, the dosage of EDTA 0.04%, and radiating time 60～80 mins, under which the conversion of the monomers was 95%～97%. The viscosity average molecular weight of PAM was up to (5.5～7.5)×106.

Key words: polyacrylamide, photopolymerization, acetone, ethylene glycol, viscosity-average molecular weight

摘要： 探讨以丙酮-乙二醇（Acetone-EG）复配作为新型光引发剂，紫外引发水溶性单体丙烯酰胺（AM）进行自由基聚合。测定引发体系水溶液的紫外吸收光谱，分析了聚合过程的影响因素，得出丙酮与EG复合后紫外波长在240～295 nm范围内有较强吸收，光聚合最佳条件为：引发体系中丙酮与EG的质量比1∶1，引发剂总量为2 mL/L，单体水溶液质量分数为30%～35%，EDTA用量为0.04%，紫外辐射时间为60～80 min。聚合过程单体转化率为95%～97%，PAM黏均分子量可达(5.5～7.5)×106。

关键词: 聚丙烯酰胺, 光聚合, 丙酮, 乙二醇, 黏均分子量