摘要:
采用丙烯酰胺(AM)和丙烯酸(AA)为主体单体,次磷酸钠为链转移剂,通过60Co-γ射线辐射引发,制备阴离子聚丙烯酰胺(APAM),研究了链转移剂含量、吸收剂量、剂量率对APAM分子量的影响.结果表明,APAM的分子量与吸收剂量呈正相关,而与链转移剂含量呈负相关.在丙烯酰胺:丙烯酸=180:60,单体浓度为30%,次磷酸钠为0.15‰,吸收剂量为300 Gy,剂量率为25 Gy/h的条件下,得到的APAM黏均分子量为2.93×107.在气动旋转反应釜中,剂量率为25~40 Gy/h,吸收剂量为125~200 Gy,合成的APAM分子量基本相同,最高可达2.88 × 107,且残留单体含量(干基)为0.01%.%Acrylamide (AM) and acrylic acid (AA) are used as main monomers,sodium hypophosphite as chain transfer agent,via 60Co-γ ray radiation polymerization anionic polyacrylamide (APAM). The effects of chain transfer agent content,radiation dose,radiation dose rate were studied.The results indicate that the molecular weight of APAM is positively correlated with the radiation dose,but negatively correla-ted with the chain transfer agent content.Under the optimized polymerization condition(AM:AA=180:60,monomers concentration 30%,NaH2PO2·H2O 0.15‰,dose 300 Gy,dose rate 25 Gy/h),the molec-ular weight can be reached 2.93×107.The radiation dose was 125~200 Gy,and the dose rate was 25~40 Gy/h in the pneumatic rotary reactor,after polymerization the molecular weight of APAM was basically the same,the highest was 2.88×107,and the residual monomer content (dry basis) was 0.01%.