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采用原子转移自由基聚合(ATRP)反应合成了甲基丙烯酸正丁酯/N-异丙基丙烯酰胺嵌段共聚物(P(n-BMAb-NIPAM))。考察了引发剂、催化剂、反应温度等对聚合反应结果的影响,最终确定较为合适的反应条件,制备出分子量确定、分子量分布较窄的大分子引发剂,并成功引发第二单体继续通过ATRP反应,获得P(nBMA-b-NIPAM)。研究结果表明:所确定的ATRP反应体系能实现n-BMA的可控聚合,获得末端带溴原子的聚甲基丙烯酸正丁酯(P(n-BMA-Br))作为大分子引发剂继续通过ATRP反应引发N-异丙基丙烯酰胺(NIPAM),最后获得分子量确定、分子量分布较窄的嵌段共聚物P(n-BMA-b-NIPAM)。实验证明,利用高价态铜络合体系可以实现单体的可控聚合,而且可以保持聚合物末端较高的卤官能度。
The n-butyl methacrylate / N-isopropylacrylamide block copolymer (P (n-BMAb-NIPAM)) was synthesized by atom transfer radical polymerization (ATRP). The effect of initiator, catalyst and reaction temperature on the polymerization results were investigated. Finally, the more suitable reaction conditions were determined, the molecular weight was determined, the molecular weight distribution was narrow, and the second monomer was successfully initiated to continue the ATRP To obtain P (nBMA-b-NIPAM). The results showed that the identified ATRP reaction system can achieve the controlled polymerization of n-BMA to obtain the poly (n-butyl methacrylate) (P (n-BMA-Br) ATRP reaction led to NIPAM. Finally, a block copolymer P (n-BMA-b-NIPAM) with a definite molecular weight and a narrow molecular weight distribution was obtained. Experiments show that the use of high-valent copper complex system can be controlled monomer polymerization, but also to maintain the polymer terminal higher halogen functionality.