Preparation of Tadpole-Shaped Amphiphilic Cyclic PS-b-linear PEO via ATRP and Click Chemistry
Preparation of Tadpole-Shaped Amphiphilic Cyclic PS-b-linear PEO via ATRP and Click Chemistry
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DOI：
10.1021/ma802361h
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发表时间：
2009-03
期刊：
影响因子：
5.5
通讯作者：
Yongquan Dong;Yin-yin Tong;Botao Dong;F. Du;Zi‐Chen Li
中科院分区：
文献类型：
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作者：
Yongquan Dong;Yin-yin Tong;Botao Dong;F. Du;Zi‐Chen Li
采用原子转移自由基聚合（ATRP）和点击化学合成了由聚苯乙烯（PS）环和聚环氧乙烷（PEO）尾组成的两亲性蝌蚪形共聚物。首先，通过点击化学和酯化反应制备了具有丙炔基和ATRP引发基的PEO。然后，通过苯乙烯的ATRP制备了一种双嵌段共聚物PEO-b-PS，该共聚物在聚苯乙烯链的交界处含有丙炔基，在聚苯乙烯链的末端含有叠氮化物基团，然后将聚苯乙烯的溴端转化为叠氮化物基团。最后，在稀溶液中通过点击化学对PS段进行环化，形成环状PS-b-线性PEO （c-PS-b-PEO）。由于PEO的链长和环状PS的环大小都易于调节，因此制备了一系列的c-PS-b-PEO。采用凝胶渗透色谱、核磁共振光谱、红外光谱和基质辅助激光解吸飞行时间质谱（MALDI-TOF MS）对所有聚合物进行了表征。c-PS-b-PEOs显示s…
Amphiphilic tadpole-shaped copolymers consisting of a polystyrene (PS) ring and a poly(ethylene oxide) (PEO) tail were synthesized via atom transfer radical polymerization (ATRP) and click chemistry. First, PEO with a propargyl group and an ATRP initiating group was prepared via click chemistry and esterification. Then, a diblock copolymer, PEO-b-PS, which contained a propargyl group at the junction point and an azide group at the PS chain end, was prepared via ATRP of styrene, followed by transformation of the PS bromo end to an azide group. Finally, cyclization of the PS segment via click chemistry in dilute solution led to the formation of cyclic PS-b-linear PEO (c-PS-b-PEO). Because both the chain length of PEO and the ring size of cyclic PS can be easily tuned, a series of c-PS-b-PEOs was prepared. All of the polymers were characterized with gel permeation chromatography, NMR spectroscopy, FTIR, and matrix-assisted laser desorption time-of-flight mass spectrometry (MALDI-TOF MS). c-PS-b-PEOs showed s...