Alternating Ring-Opening Metathesis Polymerization Provides Easy Access to Functional and Fully Degradable Polymers
作者:Francis O. Boadi、Jingling Zhang、Xiaoxi Yu、Surita R. Bhatia、Nicole S. Sampson
DOI:10.1021/acs.macromol.0c01051
日期:2020.7.28
Polymers with hydrolyzable groups in their backbones have numerous potential applications in biomedicine, lithography, energy storage, and electronics. In this study, acetal and ester functionalities were incorporated into the backbones of copolymers by means of alternating ring-opening metathesis polymerization catalyzed by the third-generation Grubbs ruthenium catalyst. Specifically, combining large-ring
在其主链中具有可水解基团的聚合物在生物医学、光刻、能量存储和电子学中具有许多潜在的应用。在这项研究中,通过由第三代格拉布斯钌催化剂催化的交替开环复分解聚合,将缩醛和酯官能团结合到共聚物的主链中。具体而言,将大环(7-10 个原子)环状缩醛或内酯单体与双环 [4.2.0]oct-1(8)-ene-8-carboxamide 单体相结合,提供了骨架中具有缩醛或酯官能团的完美交替共聚物和低至中等分子量分布 ( D̵ M= 1.2–1.6)。含有酯和缩醛主链的共聚物分别在碱性条件 (pH 13) 和酸性条件 (pH ≤ 5) 下显着水解,在中等温度下 30 小时内产生预期的副产物。与具有全碳主链的共聚物不同,具有含杂原子主链的共聚物表现出具有交叉频率的粘弹性行为,随着缩醛上 R 基团大小的增加而降低。相比之下,玻璃化转变温度 ( T g) 随着 R 组大小的减小而减小。缩醛共聚物的水解速率也取决于