Direct synthesis of thermally responsive DMA/NIPAM diblock and DMA/NIPAM/DMA triblock copolymers via aqueous, room temperature RAFT polymerization
Direct synthesis of thermally responsive DMA/NIPAM diblock and DMA/NIPAM/DMA triblock copolymers via aqueous, room temperature RAFT polymerization
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DOI：
10.1021/ma0523419
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发表时间：
2006-03-07
期刊：
影响因子：
5.5
通讯作者：
McCormick, CL
中科院分区：
文献类型：
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作者：
Convertine, AJ;Lokitz, BS;McCormick, CL
我们报告的水，室温RAFT聚合的N-异丙基丙烯酰胺（NIPAM），随后，它的嵌段共聚利用聚（N，N-二甲基丙烯酰胺）大CTA。合成了一系列热响应性AB二嵌段和阿坝三嵌段共聚物。这些聚合物含有固定分子量的亲水性N，N-二甲基丙烯酰胺（DMA）A嵌段和不同链长的温度响应性NIPAM B嵌段。使用H-1 NMR光谱，T-2弛豫测量，动态光散射（DLS）和静态光散射（SLS）的组合，我们证明，这些嵌段共聚物确实能够可逆地形成胶束在溶液温度的变化，胶束的大小和转变温度取决于两个NIPAM嵌段长度和聚合物结构（二嵌段与三嵌段）。
We report aqueous, room temperature RAFT polymerization of N-isopropylacrylamide (NIPAM) and, subsequently, its block copolymerization utilizing a poly(N,N-dimethylacrylamide) macro-CTA. A series of thermally responsive AB diblock and ABA triblock copolymers have been prepared. These polymers contain hydrophilic N,N-dimethylacrylamide (DMA) A blocks of fixed molecular weight and temperature-responsive NIPAM B blocks of varied chain length. Using a combination of H-1 NMR spectroscopy, T-2 relaxation measurements, dynamic light scattering (DLS), and static light scattering (SLS), we demonstrate that these block copolymers are indeed capable of reversibly forming micelles in response to changes in solution temperature and that the micellar size and transition temperature are dependent on both the NIPAM block length and the polymer architecture (diblock vs triblock).