Nitroxide polymer brushes prepared by surface-initiated ARGET ATRP and their selective oxidation performances
Nitroxide polymer brushes prepared by surface-initiated ARGET ATRP and their selective oxidation performances
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DOI：
10.3144/expresspolymlett.2014.87
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发表时间：
2014
影响因子：
3.3
通讯作者：
S. J. Liu;Q. Hu;F. Zhao;X. Chu;P. Li;E. Tang
中科院分区：
文献类型：
--
作者：
S. J. Liu;Q. Hu;F. Zhao;X. Chu;P. Li;E. Tang
通过表面引发ARGET（电子转移再生活化剂）ATRP（原子转移自由基聚合），在交联聚苯乙烯（PS）微球上接枝甲基丙烯酸2，2，6，6-四甲基-4-哌啶酯（TMPM）单元的聚合物刷。它们被进一步氧化以产生含有氮氧自由基单元（克里思）的氮氧聚合物刷。用傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）、透射电镜（TEM）、电子自旋共振（ESR）和凝胶渗透色谱（GPC）对聚合物刷进行了表征。研究了氮氧聚合物刷对苯甲醇选择性氧化的催化性能。结果表明，该方法性能良好，收率可达96%.此外，块刷在活性和选择性方面具有与非负载克里思类似的催化剂性能。可通过离心回收。实现了催化剂高性能和易回收的统一。
Polymer brushes with 2,2,6,6-tetramethyl-4-piperidyl methacrylate (TMPM) units, grafted on the cross-linked polystyrene (PS) microspheres, were synthesized via surface-initiated ARGET (activators regenerated by electron transfer) ATRP (atom transfer radical polymerization). They were further oxidized to yield nitroxide polymer brushes containing nitroxide radical units (TEMPO). The obtained polymer brushes were characterized by Fourier transform infrared spec- troscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron spin resonance (ESR) and gel permeation chromatography (GPC). The catalytic properties of nitroxide polymer brushes for selective oxi- dation of benzyl alcohol were investigated. The results showed that the performances were good and the yield was up to 96%. Furthermore, the block brush had similar catalyst properties to non-supported TEMPO in terms of activity and selec- tivity. It could be recovered by centrifugation. The unity of high catalyst property and easy recovery was achieved.