低分子量聚丙烯酰胺的水溶液聚合

The Aqueous Solution Polymerization of Acrylamide with Low Molecular Weight

采用含少量溶剂的水溶液聚合法合成分子量为（20。40）x104的低分子量聚丙烯酰胺（PAM）．以丙酮为移热剂和链转移剂，过硫酸铵为引发剂，探讨了溶剂、引发剂、反应温度及反应时间对聚合物分子量的影响．在单体质量分数为15％，引发剂浓度为（2．34—8．04）x10-3mol／L，移热溶剂为（0．37—1．23）~10-3mol／L，反应温度为84—92℃，滴加时间1．5h，保温时间1．5h的条件下，获得分子量在（20-40）×104的聚丙烯酰胺．

The polyacrylamide with low molecular weight was prepared by aqueous solution polymenzauon containing a small quantity of organic solvent. Acetone as chain-transfer agent and ammonia persulfate as initiator, the influence on molecular weight of polyacrylamide of amount of solvent, initiator and chain-transfer agent has been studied. The polyaerylamide with molecular weight of （2.0-4.0）xl0s was derived under determined condition： total monomers mass fraction （based on the reaction system） =15%, initiator concentration= （2.34~8.04） xl0-3 mol/L, the amount of solvent= （0.37-1.23）~10-3 tool/L, reaction temperature=84-92 ~C, droping time=l.5 h.