【摘要】 <正> 为制备高分子量聚丙烯酰胺(PAM),对其引发体系,尤其是对氧化还原引发做了许多探索。最近等研究了过硫酸盐与脲构成的氧化还原引发体系,等利用顺磁共振法确定了这一反应机理:更多还原

【Abstract】 The kinetics of aqueous polymerization of acrylamide initiated by potassium pcrsulfate and urea was investigated. The results arc sumarizod in the empirical expression, Rp∝[AM]1.5CK2S2O8]0.45[CO(NH2)2] in the range of CK2S2O8]= (1.036-7.542).10-5m0l/LandCCO(NH2)23= (0.479-47.930)-10-4 mol/L.The overall activation energy of polymerization equals 51.27 kJ/mol which confirms that this initiation is a redox reaction. The effect of urea on molecular weight of the polymers is discussed.更多还原