Abstract Reversible-deactivation radical polymerizations (RDRP) of acrylamide (AM) was carried out via dispersion polymerization mediated by cobalt complexes in alcohol/water and initiated by azobisisobutyronitrile (AIBN) at 65 °C. Well-defined polyacrylamide (PAM) uniform spherical particles with predetermined molecular weight and relatively narrow dispersity (Đ = 1.24–1.53) were obtained under mild thermal conditions based on one polymer chain per cobalt complex demonstrate the living characters of the polymerization process. The living character was demonstrated by the linear fit with different feeding ratios of AM and cobalt complex, as well as a linear increase in the number- average molecular weight observed with the monomer conversion. It is worth pointing out that the high conversion of AM (>90%) was obtained with formation of well-controlled PAM, relative to the cobalt porphyrin (The conversion of AM reached 40%) in dispersion polymerization condition. The effects of the volume ratio of alcohol and water on the morphology of the spherical particles were investigated. There were increasing trends in the particle size with the increasing volume ratio of alcohol and water. Solution polymerization of acrylamide was also studied in the same condition. Linear fit with different feeding ratios of AM and cobalt complex were obtained.

中文翻译：

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由氨基-双（酚盐）配体支持的钴配合物介导的丙烯酰胺的可逆失活自由基聚合

摘要 丙烯酰胺 (AM) 的可逆失活自由基聚合 (RDRP) 通过由钴配合物在醇/水中介导的分散聚合进行，并由偶氮二异丁腈 (AIBN) 在 65 °C 下引发。基于每个钴配合物一个聚合物链，在温和的热条件下获得了具有预定分子量和相对窄的分散性 (Đ = 1.24–1.53) 的明确定义的聚丙烯酰胺 (PAM) 均匀球形颗粒，证明了聚合过程的活性特征。活性特征通过与 AM 和钴络合物的不同进料比的线性拟合以及在单体转化中观察到的数均分子量的线性增加来证明。值得指出的是，AM(> 相对于分散聚合条件下的钴卟啉（AM 的转化率达到 40%），通过形成良好控制的 PAM 获得了 90%）。考察了醇和水的体积比对球形颗粒形貌的影响。随着醇与水体积比的增大，粒径有增大的趋势。在相同条件下也研究了丙烯酰胺的溶液聚合。获得了不同AM和钴配合物进料比的线性拟合。随着醇与水体积比的增大，粒径有增大的趋势。在相同条件下也研究了丙烯酰胺的溶液聚合。获得了不同AM和钴配合物进料比的线性拟合。随着醇与水体积比的增大，粒径有增大的趋势。在相同条件下也研究了丙烯酰胺的溶液聚合。获得了不同AM和钴配合物进料比的线性拟合。