We report a novel multicomponent initiators-based copolymerization strategy for synthesizing of acrylamide (AM) and 2-acrylamide-2-methylpropane sulfonic acid (AMPS) copolymers, denoted by P(AM-co-AMPS), with an ultra-high content of AMPS (≥50 mol%) and an ultra-high molecular weight (>107 g/mol), while achieving a high conversion rate of monomer (∼100.0 %). The multicomponent initiators contain a redox couple, an azo compound, and a catalyst. Our investigation into the mechanism suggested that the synergistic effect in different rate constant for initiator decomposition between redox and azo initiators was responsible for actualizing ultra-high molecular weight copolymers with high conversion rates of monomer. Moreover, copolymers with 75 mol% and 100 mol% of AMPS were synthesized to verify the advantage of the multicomponent initiators-based strategy, both of which exhibited ultra-high molecular weights and ultra-high monomer conversion rates. This study fills a long-standing gap in research on the polyacrylamide family by providing highly functionalized P(AM-co-AMPS) with an ultra-high molecular weight. Moreover, it reveals how multicomponent initiators reconcile the contradiction between the ultra-high molecular weight and the high conversion rate in copolymerization.

中文翻译：

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易于获得具有超高分子量的高功能化聚丙烯酰胺：基于多组分引发剂的自由基聚合


我们报道了一种基于多组分引发剂的新型共聚策略，用于合成丙烯酰胺 （AM） 和 2-丙烯酰胺-2-甲基丙烷磺酸 （AMPS） 共聚物，用 P（AM-co-AMPS） 表示，具有超高含量的 AMPS （≥50 mol%） 和超高分子量 （>107 g/mol），同时实现高单体转化率 （∼100.0 %）。多组分引发剂包含一个氧化还原对、一个偶氮化合物和一个催化剂。我们对机理的研究表明，氧化还原和偶氮引发剂之间不同速率常数引发剂分解的协同作用是实现具有高单体转化率的超高分子量共聚物的原因。此外，合成了 75 mol% 和 100 mol% AMPS 的共聚物，以验证基于多组分引发剂的策略的优势，这两种策略都表现出超高分子量和超高单体转化率。本研究通过提供具有超高分子量的高度官能化 P（AM-co-AMPS） 填补了聚丙烯酰胺家族研究中长期存在的空白。此外，它揭示了多组分引发剂如何调和共聚中超高分子量和高转化率之间的矛盾。