Synthesis and characterization of amphiphilic triblock Copolymers with Identical compositions but different block sequences
Synthesis and characterization of amphiphilic triblock Copolymers with Identical compositions but different block sequences
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具有相同组成但不同嵌段序列的两亲性三嵌段共聚物的合成和表征
DOI：
10.1039/c4ra07084d
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发表时间：
2014-09
期刊：
影响因子：
3.9
通讯作者：
Wang, Guowei
中科院分区：
文献类型：
--
作者：
Lu, Chengjiao;Chen, Lingdi;Huang, Kun;Wang, Guowei
采用原子转移自由基聚合(ATRP)机理和氮氧自由基偶联(NRC)反应或铜催化叠氮化反应(CuAAC)相结合的方法，合成了组成相同但嵌段顺序不同的两亲性三嵌段共聚物聚(丙烯酸)-b-聚苯乙烯-b-聚丙烯酸(PAA-b-PS-b-PAA)和PS-b-PAA-b-PS。首先，以丙烯酸三甲基硅酯(TMS-PgBiB)为引发剂，以苯乙烯(St)和丙烯酸叔丁酯(TBA)为单体，采用ATRP法合成了两嵌段共聚物TMS-PS-b-PtBA-BR。然后，通过TMS-PS-b-PtBA-BR与偶联剂双[4-(2，2，6，6-四甲基哌啶-1-氧基)]琥珀酸酯(Bis-TEMPO2)的NRC反应，合成了三嵌段共聚物PS-b-PtBA-b-PS。以烷基PS-b-PtBA-BR和偶联剂1，4-二叠氮丁烷(Di-azide2)为原料，通过CuAAC化学合成了三嵌段共聚物PtBA-b-PS-b-PtBA。通过裂解相应的PS-b-PtBA-b-PS和PtBA-b-PS-b-PtBA，最终得到目标三嵌段共聚物PAA-b-PS-b-PAA和PS-b-PAA-b-PS。用FLS、FESEM和DLS等仪器对其自组装行为进行了初步研究，结果表明，PS-b-PAA-b-PS和PAA-b-PS-b-PAA在水中的临界胶束浓度(CMC)值不同，胶束大小也不同。
The amphiphilic triblock copolymers poly(acrylic acid)-b-poly(styrene)-b-poly(acrylic acid) (PAA-b-PS-b-PAA) and PS-b-PAA-b-PS with identical compositions but different block sequences were synthesized by a combination of an atom transfer radical polymerization (ATRP) mechanism and a nitroxide radical coupling (NRC) reaction or copper-catalyzed azide/alkyne click (CuAAC) chemistry. Firstly, the diblock copolymers TMS––PS-b-PtBA-Br were prepared by sequential ATRP of styrene (St) and tert-butyl acrylate (tBA) monomers from trimethylsilyl propargyl 2-bromoisobutyrate (TMS-PgBiB) initiator. Then, the triblock copolymers PS-b-PtBA-b-PS were prepared by NRC reaction between TMS––PS-b-PtBA-Br and coupling agent bis[4-(2,2,6,6-tetramethylpiperidine-1-oxyl)] succinate (Bis-TEMPO2). And the triblock copolymers PtBA-b-PS-b-PtBA were obtained by CuAAC chemistry between Alkynyl-PS-b-PtBA-Br and a coupling agent 1,4-diazidobutane (Di-Azide2). The target triblock copolymers PAA-b-PS-b-PAA and PS-b-PAA-b-PS were finally derived from the cleavage of the corresponding PS-b-PtBA-b-PS and PtBA-b-PS-b-PtBA. The self-assembly behaviour was preliminarily studied by FLS, FESEM and DLS instruments, and the results showed that the PS-b-PAA-b-PS and PAA-b-PS-b-PAA could give distinct critical micelle concentration (cmc) values and different sizes of micelles in water.
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影响因子：
4.6
作者：
J. Ruehl;Aaron Nilsen;S. Born;P. Thoniyot;Li-Ping Xu;Shaowei Chen;R. Braslau
通讯作者：
J. Ruehl;Aaron Nilsen;S. Born;P. Thoniyot;Li-Ping Xu;Shaowei Chen;R. Braslau
影响因子：
8.6
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
4.6
作者：
Guowei Wang;Junlian Huang
通讯作者：
Guowei Wang;Junlian Huang
影响因子：
5.5
作者：
M. Wrue;Aaron C Mcumber;M. Anthamatten
通讯作者：
M. Wrue;Aaron C Mcumber;M. Anthamatten