Visible Light-Induced RAFT Polymerization of Methacrylate with 4-(N,N-diphenylamino)benzaldehyde as Organophotoredox Catalyst and the Effect of Temperature on the Polymerization
Visible Light-Induced RAFT Polymerization of Methacrylate with 4-(N,N-diphenylamino)benzaldehyde as Organophotoredox Catalyst and the Effect of Temperature on the Polymerization
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4-(N,N-二苯氨基)苯甲醛为有机光氧化还原催化剂的甲基丙烯酸酯的可见光诱导RAFT聚合及温度对聚合的影响
DOI：
10.1002/macp.201900022
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发表时间：
2019
影响因子：
2.5
通讯作者：
Yang Wantai
中科院分区：
文献类型：
--
作者：
Zhang Wenxiu;Zhang Xianhong;Ma Yuhong;Chen Dong;Yang Wantai
4-(N,N-二苯氨基)苯甲醛 (DPAB) 在 270-435 nm 范围内具有紫外可见吸收，可与 4-cynao-4-(苯基硫酰硫基)戊酸 (CTP) 进行有效的光还原猝灭。在可见光照射下，在 DPAB 和 CTP 存在下，甲基丙烯酸甲酯 (MMA) 在 33、40 和 50 °C 下的聚合速率分别为 0.019、0.056 和 0.102 h−1。 50℃暗反应120小时不产生PMMA。通过随着单体转化率和窄多分散指数（PDI）线性增加Mn、扩链以及与甲基丙烯酸苄酯（BnMA）和聚（乙二醇）单甲醚甲基丙烯酸酯（PEGMA）的嵌段聚合，证明了其活性特征。对于PMMA-CTP（Mn = 6800，PDI = 1.17），扩链使PMMA具有Mn = 15 900和PDI = 1.15。以PMMA-CTP（Mn=6000，PDI=1.21）作为大分子RAFT，制备Mn=12 600（PDI=1.44）和Mn=18 500（PDI=1.31）的PMMA-b-PBnMA。这些结果表明，聚合温度和可见光照射对 photo-RAFT 具有积极的协同作用，且不会失去活性特征。
With UV–vis absorption in the range of 270–435 nm, 4‐(N,N‐diphenylamino)benzaldehyde (DPAB) takes efficient photoreduction quench with 4‐cynao‐4‐(phenylcarbonothioylthio)pentanoic acid (CTP). The polymerization rates of methyl methacrylate (MMA) are 0.019, 0.056, and 0.102 h−1at 33, 40, and 50 °C, respectively, in the presence of DPAB and CTP under visible‐light irradiation. Dark reaction produces no PMMA at 50 °C for 120 h. The living feature is demonstrated by linearly increasingMnwith the monomer conversions and narrow polydispersity index (PDI), chain extension, and block polymerizations with benzyl methacrylate (BnMA) and poly(ethylene glycol) monomethyl ether methacrylate (PEGMA). With PMMA‐CTP (Mn= 6800, PDI = 1.17), chain extension gives PMMA withMn= 15 900 and PDI = 1.15. With PMMA‐CTP (Mn= 6000, PDI = 1.21) as macro‐RAFT, PMMA‐b‐PBnMA ofMn= 12 600 (PDI = 1.44) andMn= 18 500 (PDI = 1.31) are prepared. These results support that there is a positive synergistic effect between polymerization temperature and visible‐light irradiation on the photo‐RAFT without losing the living features.