摘要:
以丙烯酰胺(AM)和对苯乙烯磺酸钠(SSS)为单体,四氯化碳(ccl4)为引发剂,以铜粉/三(N,N-二甲基氨基乙基)胺(Cu0/Me6-TREN)为催化剂,采用单电子转移活性自由基聚合(SET-LRP)方法,在25°C水溶液中制备了四臂星形二元共聚物P(AM-SSS).采用红外光谱法、核磁共振对合成的共聚物进行分析表征,并考察了催化体系用量、引发剂用量、引发温度及功能单体AM与SSS的用量等因素对聚合物黏均分子量Mη的影响,同时测定了不同浓度盐溶液中聚合物溶液的表观黏度.结果表明:在引发温度25°C、单体AM与SSS的摩尔比为680:20、引发剂质量分数0.068%、催化体系占单体的质量分数为0.7%的条件下,所得聚合物产品相对分子质量最高,达到176万,聚合反应产率最高可达89%;此外,与Mg2相比,Na+对该聚丙烯酰胺表观黏度的影响更为显著.%The four-arm star-shaped P (AM-SSS) is synthesized by single electron transfer living radical polymerization (SETLRP) in 25 °C aqueous solution by using acrylamide (AM) and sodium styrene sulfonate (SSS) as monomer,carbon tetrachloride (CC14) as initiator,and tris-(N,N-2-dimethylaminoethyl) amine (Cu0/Me6-TREN) as catalyst.The target products are analyzed and characterized by infrared spectrum (FT-IR) and nuclear magnetic resonance (1 H NMR).The effect of the amount of catalyst and initiator,reaction temperature,and the amount of sodium styrene sulfonate on the viscosity average molecular weight (Mη) of the polymer is investigated,and the apparent viscosity of polymer solution at different mineralization degree is also measured.The results show that when the reaction temperature is 25 °C,the monomer molar ratio of AM to SSS is 680:20,the mass fraction of initiator is 0.068%,and the amount of catalyst is 0.7% of the monomer amount,the maximal molecular weight of the star-shaped P(AM-SSS) polymer can reach up to 176 × 104,and the polymerization yield is up to 89%.In addition,compared with Mg2+,the effect of Na+ on the apparent viscosity of the polyacrylamide is more significant.