Nitroxide-mediated polymerization to form symmetrical ABA triblock copolymers from a bidirectional alkoxyamine initiator
Nitroxide-mediated polymerization to form symmetrical ABA triblock copolymers from a bidirectional alkoxyamine initiator
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DOI：
10.1016/j.polymer.2007.03.008
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发表时间：
2007-04
期刊：
影响因子：
4.6
通讯作者：
J. Ruehl;Aaron Nilsen;S. Born;P. Thoniyot;Li-Ping Xu;Shaowei Chen;R. Braslau
中科院分区：
文献类型：
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作者：
J. Ruehl;Aaron Nilsen;S. Born;P. Thoniyot;Li-Ping Xu;Shaowei Chen;R. Braslau
合成了双向烷氧基胺2，并将其用作苯乙烯（S）、丙烯酸正丁酯（nBA）、丙烯酸叔丁酯（tBA）、异戊二烯（I）和二甲基丙烯酰胺（DMA）的聚合引发剂。制备了各种对称的阿坝三嵌段共聚物，其大小范围为5至59 kDa。动力学研究和凝胶渗透色谱法（GPC）证实了这些聚合的“活”的性质。使用三氟乙酸将这些聚合物的PtBA嵌段转化为聚（丙烯酸）（PAA）嵌段，形成阿坝两亲性三嵌段共聚物。PAA-b-PnBA-b-PAA和PAA-b-PS-b-PAA三嵌段共聚物的AFM图像显示了自组装的证据。
Bidirectional alkoxyamine 2 was synthesized and used as the initiator in the polymerization of styrene (S), n-butyl acrylate (nBA), t-butyl acrylate (tBA), isoprene (I), and dimethylacrylamide (DMA). A variety of symmetrical ABA triblock copolymers were prepared, ranging in size from 5 to 59kDa. Kinetics studies and gel permeation chromatography (GPC) confirmed the “living” nature of these polymerizations. Trifluoroacetic acid was used to convert the PtBA blocks of these polymers into poly(acrylic acid) (PAA) blocks, forming ABA amphiphilic triblock copolymers. AFM images of PAA-b-PnBA-b-PAA and PAA-b-PS-b-PAA triblock copolymers ionized by the addition of 2,2′-(ethylenedioxy)bis(ethylamine) show evidence of self-assembly.