Synthesis of comb polymers via grafting‐onto macromolecules bearing pendant diene groups via the hetero‐Diels‐Alder‐RAFT click concept
作者:Antoine Bousquet、Christopher Barner‐Kowollik、Martina H. Stenzel
DOI:10.1002/pola.23943
日期:2010.4.15
Comb polymers were synthesized by the “grafting‐onto” method via a combination of Reversible Addition‐Fragmentation Chain Transfer (RAFT) polymerization and the hetero‐Diels‐Alder (HDA) cycloaddition. The HDA reactive monomer trans, trans‐hexa‐2,4‐dienylacrylate (ttHA) was copolymerized with styrene via the RAFT process. Crosslinking was minimized by decreasing the monomer concentration—whilst keeping
通过“可逆嫁接”方法,通过可逆加成-断裂链转移(RAFT)聚合和杂-Diels-Alder(HDA)环加成的组合合成梳状聚合物。通过RAFT工艺将HDA反应性单体反式,反式-六-2-4,4-二烯基丙烯酸酯(ttHA)与苯乙烯共聚。通过降低单体浓度(同时保持单体到聚合物的转化率较低),可最大程度地减少交联,从而获得反应性主链,其中10个苯乙烯单元平均具有一个反应性侧链二烯基。在共聚物的二烯官能团和聚丙烯酸正丁酯(P n)之间进行HDA环加成反应BA)是通过吡啶2-2-基二硫代甲酸酯通过RAFT聚合制备的,可以用作亲双烯体。该偶联反应在50℃下24小时内进行,并且接枝率从75%变化到100%,这取决于数均分子量P的Ñ BA(3500克摩尔-1 <中号Ñ <13000克摩尔- 1)接枝链与反应的化学计量。接枝的嵌段共聚物的分子量在19,000g mol -1至58,000g mol -1的范围内,多分散性接近1