Mild and Efficient Modular Synthesis of Poly(acrylonitrile-<i>co</i>-butadiene) Block and Miktoarm Star Copolymer Architectures
作者:Christoph J. Dürr、Lebohang Hlalele、Andreas Kaiser、Sven Brandau、Christopher Barner-Kowollik
DOI:10.1021/ma302017c
日期:2013.1.8
presence of 9.9–12.6 wt % (block copolymers) and 20 wt % (stars) of polymer chains not participating in the HDA conjugation, respectively. The residual polymers were analyzed toward their origin from either the loss of functionality during RAFT polymerization or incomplete conversion during the conjugation process. The comprehensive analysis of the macromolecular material was underpinned by kinetic simulations
描述了一种合成聚(丙烯腈-共-丁二烯)(NBR)和聚(苯乙烯-共-丙烯腈)(SAN)的嵌段共聚物的有效方法。预先形成的聚合物结构单元的共轭是通过杂Diels-Alder(HDA)机制实现的,该机制采用环戊二烯封端的NBR与亲二烯体SAN共聚物,两者均通过可逆加成-断裂链转移(RAFT)聚合合成。该协议进一步扩展到由两个NBR和两个SAN臂组成的4-mockarm星型聚合物的合成。摩尔质量的复杂大分子结构范围从低于10000 g·mol –1到110 000 g·mol –1分散度低于1.5。偶联部分的分子验证通过NMR光谱法和ESI质谱法提供。通过反卷积技术对获得的嵌段共聚物和miktoarm星形聚合物的尺寸排阻色谱(SEC)痕迹进行了分析,发现存在9.9–12.6 wt%(嵌段共聚物)和20 wt%(星形)的未参与HDA的聚合物链共轭,分别。从RAFT聚合过程中官能度的丧失或共轭过程中转