Visible-light Induced RAFT Polymerization of Methacryaltes with Bezaldehyde Derivatives as Organophotoredox Catalysts
Visible-light Induced RAFT Polymerization of Methacryaltes with Bezaldehyde Derivatives as Organophotoredox Catalysts
复制标题
苯甲醛衍生物作为有机光氧化还原催化剂的可见光诱导甲基丙烯酸酯的 RAFT 聚合
DOI：
10.1002/pola.28890
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Wantai Yang
中科院分区：
文献类型：
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作者：
Qian Yang;Xianhong Zhang;Wenchao Ma;Yuhong Ma;Dong Chen;Li Wang;Changwen Zhao;Wantai Yang
以苯甲醛衍生物2，4-二甲氧基苯甲醛（PC 1）和对茴香醛（PC 2）为光氧化还原催化剂，与RAFT试剂4-氰基-4-（苯硫代羰基硫代）戊酸（CTP）在室温下成功地催化了甲基丙烯酸甲酯（MMA）和甲基丙烯酸苄酯（BnMA）的可控光诱导电子转移RAFT聚合（PET-RAFT）.聚合反应动力学表现出一级相对于单体转化。聚合物的数均分子量（Mn）随单体转化率的增加而线性增加，并保持较窄的多分散性（PDI =Mw/Mn）。例如，随着单体转化率从11%增加到85%，PMMA的Mn从约3400增加到17，300 g mol-1，并且PDI保持在约1.36。以PC 1和PC 2为催化剂的聚合反应的活性特征也被PMMA-B-PBnMA二嵌段共聚物的扩链和合成所进一步支持。因此，苯甲醛衍生物催化的PET-RAFT聚合的简单性和有效性已在温和条件下得到证实。© 2017 Wiley Periodicals，Inc. J.波利姆科学，A部分：聚合物2018，56，229-236
The benzaldehyde derivatives, such as 2,4‐dimethoxy benzaldehyde (PC1) andp‐anisaldehyde (PC2), were successfully used as photoredox catalysts (PCs) in combination with typical RAFT agent 4‐cyano‐4‐(phenylcarbonothioylthio)pentanoic acid (CTP) for the controlled photoinduced electron transfer RAFT polymerization (PET‐RAFT) of methyl methacrylate (MMA) and benzyl methacrylate (BnMA) at room temperature. The kinetics of the polymerizations showed first order with respect to monomer conversions. Besides, the average number molecular weights (Mn) of the produced polymers increased linearly with the monomer conversions and kept relatively narrow polydispersity (PDI =Mw/Mn). For example, theMnof PMMA increased from about 3400 to 17,300 g mol−1with the increasing in monomer conversion from 11% to 85%, and the PDI maintained around 1.36. The living features of polymerizations with the PC1 and PC2 as catalysts have also been further supported by chain extension and synthesis of PMMA‐b‐PBnMA diblock copolymer. As a result, the simplicity and efficiency of benzaldehyde derivatives catalyzed PET‐RAFT polymerization have been demonstrated under mild conditions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2018,56, 229–236