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Controlled synthesis of azobenzene-containing block copolymers both in the main- and side-chain from SET-LRP polymers via ADMET polymerization
Polymer ( IF 4.6 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.polymer.2020.122229
Liang Ding , Yadi Li , Hui Cang , Juan Li , Chengshuang Wang , Wei Song

Novel ABA triblock copolymer contained azobenzene (azo) chromophores both in the main- and side-chain was designed and synthesized via combination of single electron transfer-living radical polymerization (SET-LRP) and acyclic diene metathesis (ADMET) polymerization. The α-bromoester end group of side-chain azo-polymer prepared in SET-LRP system using acrylate bearing azo group as monomer was reacted with potassium acrylate to yield azo-polymer with the chain end of α-acrylate, which acted as a monofunctional macromolecular chain stopper for subsequent ADMET polymerization of azo-functionalized α,ω-diene monomer to finally controllable synthesize ABA triblock azo-copolymer. The diluted solutions of main-chain ADMET azo-homopolymer, side-chain SET-LRP azo-homopolymer, and main-side chains azo-copolymer exhibited different photoisomerization behaviors (maximum absorption and rate of photoisomerization) under the irradiation of UV and visible light. All these interesting results could provide a guide for the design of photosensitive materials.



中文翻译:

SET-LRP聚合物通过ADMET聚合可控地合成主链和侧链含偶氮苯的嵌段共聚物

通过单活电子自由基聚合(SET-LRP)和无环二烯复分解(ADMET)聚合反应,设计合成了主链和侧链均含有偶氮苯(偶氮)发色团的新型ABA三嵌段共聚物。以带有偶氮基的丙烯酸酯为单体,在SET-LRP系统中制备的侧链偶氮聚合物的α-溴酸酯端基与丙烯酸钾反应,制得具有α-丙烯酸酯链端的偶氮聚合物大分子链终止剂,用于随后偶氮官能化的α,ω-二烯单体的ADMET聚合,最终可控地合成ABA三嵌段偶氮共聚物。主链ADMET偶氮均聚物,侧链SET-LRP偶氮均聚物的稀释溶液,在紫外和可见光照射下,偶氮共聚物和主侧链偶氮共聚物表现出不同的光异构化行为(最大吸收和光异构化速率)。所有这些有趣的结果可以为光敏材料的设计提供指导。

更新日期:2020-01-27
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