Synthesis, characterization and the paramagnetic properties of bottle-brush copolymers with shielding TEMPO radicals
Synthesis, characterization and the paramagnetic properties of bottle-brush copolymers with shielding TEMPO radicals
复制标题
具有屏蔽 TEMPO 自由基的瓶刷共聚物的合成、表征及其顺磁性能
DOI：
10.1039/c7py01683b
复制
发表时间：
2017-11
影响因子：
4.6
通讯作者：
Guowei Wang
中科院分区：
文献类型：
--
作者：
Jian Wang;Zhigang Wu;Hongying Shen;Guowei Wang
Bottle-brush copolymers poly(2-hydroxyethyl methacrylate)(PHEMA)-g-{[(poly(acrylic acid)-g-2,2,6,6-tetramethylpiperidine-1-oxyl)]-b-poly(methyl acrylate)} (PHEMA-g-[(PAA-g-TEMPO)-b-PMA]) and PHEMA-g-(PAA-g-TEMPO) with shielding 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radicals were synthesized, and their paramagnetic properties were compared in bulk and solution, respectively. Firstly, using a “grafting from” strategy, the atom transfer radical polymerization (ATRP) of tert-butylacrylate (tBA) permitted the successful synthesis of the bottle-brush copolymer PHEMA-g-PtBA from the macro-initiator poly[2-(2-bromoisobutyryloxy)ethyl methacrylate] (PBiBEMA) with a high density of initiating sites. Subsequently, following a second “grafting from” strategy and the ATRP of methyl acrylate (MA), the bottle-brush copolymer PHEMA-g-(PtBA-b-PMA) was further produced by employing PHEMA-g-PtBA as the macro-initiator. The poly(acrylic acid) (PAA) segment generated by the selective hydrolysis of the PtBA segment was used to introduce TEMPO radicals through the reaction between carboxyl groups on PAA and oxirane group on glycidoloxy-2,2,6,6-tetramethyl piperidine-1-oxyl (GTEMPO). With the shielding by the outer PMA segment in PHEMA-g-[(PAA-g-TEMPO)-b-PMA], superfine information of inner TEMPO radicals in the electron paramagnetic resonance (EPR) spectrum could be well discriminated. However, the PHEMA-g-(PAA-g-TEMPO) without any shielding showed a broad EPR spectrum, which was in accordance with a characteristic EPR spectrum of a polyradical polymer due to the strong interactions between radicals.
登录
查看更多内容
影响因子：
4.6
作者：
Kejian Yao;Ying Chen;Jun Zhang;C. Bunyard;Chuanbing Tang
通讯作者：
Kejian Yao;Ying Chen;Jun Zhang;C. Bunyard;Chuanbing Tang
影响因子：
5.5
作者：
Jiaxing Zhang;Hongying Shen;Wen-Tao Song;Guowei Wang
通讯作者：
Jiaxing Zhang;Hongying Shen;Wen-Tao Song;Guowei Wang
影响因子：
--
作者：
V. Lloveras;E. Badetti;K. Wurst;V. Chechik;J. Veciana;J. Vidal-Gancedo
通讯作者：
V. Lloveras;E. Badetti;K. Wurst;V. Chechik;J. Veciana;J. Vidal-Gancedo
影响因子：
1.7
作者：
E. G. Rozantsev
通讯作者：
E. G. Rozantsev
影响因子：
4.6
作者：
Guowei Wang;Junlian Huang
通讯作者：
Guowei Wang;Junlian Huang