Soluble Main-Chain Azobenzene Polymers via Thermal 1,3-Dipolar Cycloaddition: Preparation and Photoresponsive Behavior
摘要:
Two soluble polymers containing azobenzene chromophore in main chain were successfully synthesized from alpha-azide, omega-alkyne A-B type azobenzene monomers, 3'-ethynylphenyl[4-hexoxyl(2-azido-2-inethylpropion
在这里,我们描述的策略制备定义明确的嵌段共聚物,聚(苯乙烯) - b -聚(乙酸乙烯酯)(PS- b经由可逆加成-断裂链转移的组合-PVAc),含偶氮苯中间部分( RAFT)聚合和“点击”化学反应。首先,合成了一种新型的RFT含α-炔烃和偶氮苯发色团的RAFT试剂2-(3-乙炔基苯基偶氮苯氧基羰基)丙-2-基-9H-咔唑-9-碳二硫代酸酯(EACDT),并用于介导RAFT聚合苯乙烯(St)。获得了定义明确的α-炔基末端官能化聚(苯乙烯)(PS)。其次,使用Z基上具有ω-叠氮化物结构的官能化RAFT试剂O-(2-叠氮基乙基)进行乙酸乙烯酯(VAc)的RAFT聚合。S-苄基二硫代碳酸酯(AEBDC)。获得了定义明确的ω-叠氮化物末端官能化聚乙酸乙烯酯(PVAc)。然后,通过“点击”化学将所得的α-炔基封端的PS与叠氮化物封端的PVAc偶联。获得具有定制结构的嵌段共聚物PS- b - PVAc。通过GPC,1
Here, we described a strategy for preparing well-defined block copolymers, poly(styrene)-b-poly(vinyl acetate) (PS-b-PVAc), containing middle azobenzene moiety via the combination of the reversible addition-fragmentation chain transfer (RAFT) polymerization and “click” chemistry. Firstly, a novel RAFT agent containing α-alkyne and azobenzene chromophore in R group, 2-(3-ethynylphenylazophenoxycarb
在这里,我们描述的策略制备定义明确的嵌段共聚物,聚(苯乙烯) - b -聚(乙酸乙烯酯)(PS- b经由可逆加成-断裂链转移的组合-PVAc),含偶氮苯中间部分( RAFT)聚合和“点击”化学反应。首先,合成了一种新型的RFT含α-炔烃和偶氮苯发色团的RAFT试剂2-(3-乙炔基苯基偶氮苯氧基羰基)丙-2-基-9H-咔唑-9-碳二硫代酸酯(EACDT),并用于介导RAFT聚合苯乙烯(St)。获得了定义明确的α-炔基末端官能化聚(苯乙烯)(PS)。其次,使用Z基上具有ω-叠氮化物结构的官能化RAFT试剂O-(2-叠氮基乙基)进行乙酸乙烯酯(VAc)的RAFT聚合。S-苄基二硫代碳酸酯(AEBDC)。获得了定义明确的ω-叠氮化物末端官能化聚乙酸乙烯酯(PVAc)。然后,通过“点击”化学将所得的α-炔基封端的PS与叠氮化物封端的PVAc偶联。获得具有定制结构的嵌段共聚物PS- b - PVAc。通过GPC,1
The synthesis and photoactive properties of cyclic amphiphilic polymers with azobenzene in main chain
(FT‐IR), and matrix‐assisted laser desorption/ionization time of flight (MALDI‐TOF) mass spectrometry were used to prove the complete conversion from linear polymers to cyclic ones. The thermal properties and photoisomerization behaviors of obtained cyclic polymers have been investigated by comparison with the linear analogues. The cyclic polymer displayed a higher glass transition temperature compared with
Two soluble polymers containing azobenzene chromophore in main chain were successfully synthesized from alpha-azide, omega-alkyne A-B type azobenzene monomers, 3'-ethynylphenyl[4-hexoxyl(2-azido-2-inethylpropion