RAFT Synthesis and Self-Assembly of Free-Base Porphyrin Cored Star Polymers
RAFT Synthesis and Self-Assembly of Free-Base Porphyrin Cored Star Polymers
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DOI：
10.1155/2011/109693
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发表时间：
2011-08
影响因子：
3.3
通讯作者：
Lin Wu;Ronan Mchale;Guoqiang Feng;Xiaosong Wang
中科院分区：
文献类型：
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作者：
Lin Wu;Ronan Mchale;Guoqiang Feng;Xiaosong Wang
报道了自由基卟啉核星星状聚合物的可逆加成断裂链转移（RAFT）合成及其自组装。在自由基卟啉核链转移剂（CTA-FBP）存在下的聚合，产生了具有受控分子量和对于包括N，N-二甲基丙烯酰胺（DMA）和苯乙烯（St）的许多单体的窄多分散性的卟啉星星聚合物。制备了两亲性星星型嵌段共聚物P-（PS-PDMA）4和P-（PDMA-PS）4（P：卟啉），并用于自组装研究。在PDMA的选择性溶剂甲醇中，两种嵌段共聚物均形成球形胶束。紫外-可见光谱研究表明，P-（PS-PDMA）4形成星形胶束，而P-（PDMA-PS）4聚集成花状胶束。分光光度滴定表明，这两种胶束对外界离子的光学响应是胶束结构的函数。这些与结构相关的性质将用于未来的胶束研究和功能材料开发。
Reversible addition fragmentation chain transfer (RAFT) synthesis and self-assembly of free-base porphyrin cored star polymers are reported. The polymerization, in the presence of a free-base porphyrin cored chain transfer agent (CTA-FBP), produced porphyrin star polymers with controlled molecular weights and narrow polydispersities for a number of monomers including N, N-dimethylacrylamide (DMA) and styrene (St). Well-defined amphiphilic star block copolymers, P-(PS-PDMA)4 and P-(PDMA-PS)4 (P: porphyrin), were also prepared and used for self-assembly studies. In methanol, a selective solvent for PDMA, spherical micelles were observed for both block copolymers as characterized by TEM. UV-vis studies suggested star-like micelles were formed from P-(PS-PDMA)4, while P-(PDMA-PS)4 aggregated into flower-like micelles. Spectrophotometric titrations indicated that the optical response of these two micelles to external ions was a function of micellar structures. These structure-related properties will be used for micelle studies and functional material development in the future.