Triple-stimuli- responsive ferrocene-containing homopolymerby RAFT polymerization
Triple-stimuli- responsive ferrocene-containing homopolymerby RAFT polymerization
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通过 RAFT 聚合制备三重刺激响应的含二茂铁均聚物
DOI：
10.1039/c7py00091j
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Huang Xiaoyu
中科院分区：
文献类型：
--
作者：
Jiang Xue;Li Ruru;Feng Chun;Lu Guolin;Huang Xiaoyu
通过RAFT均聚反应合成了含二茂铁（Fc）单元和N，N-二乙基氨基乙基（DEAE）基团的丙烯酸酯单体，即2-（3-（N-（2-（二乙基氨基）乙基）丙烯酰胺基）丙酰氧基）乙基二茂铁羧酸酯（Fc-DEAE-AM）。作为一种理想的氧化还原响应基团，疏水性的Fc可以被氧化剂氧化成亲水性的Fc+，为制备各种含Fc的氧化还原响应材料提供了巨大的机会。另一方面，DEAE基团的pH/CO2响应可逆性质使得构建智能系统以适应实际应用中的复杂环境成为可能。通过荧光探针、紫外/维斯透射率、zeta电位、透射电子显微镜（TEM）和动态光散射（DLS）的组合来检查定义明确的聚（Fc-DEAE-AM）均聚物的刺激响应性聚集行为。事实上，由于Fc和DEAE基团提供的氧化还原和pH/CO2响应特性，聚（Fc-DEAE-AM）均聚物在水溶液中表现出明显的相变。此外，这种均聚物在酸性水溶液中可以形成典型的球形颗粒，氧化还原剂可以导致聚集体的尺寸和形态发生变化。因此，我们提供了一种新的和有效的方法来制备三重刺激响应的含Fc的均聚物，这可能会被用来作为有趣的构建块，用于制造多个刺激响应功能材料。
Well-defined ferrocene-containing homopolymers were synthesized by RAFT homopolymerization of an acrylate monomer bearing a ferrocene (Fc) unit and an N,N-diethylamino ethyl (DEAE) group, i.e. 2-(3-(N-(2-(diethylamino)ethyl)-acrylamido)propanoyloxy)ethyl ferrocenecarboxylate (Fc-DEAE-AM). As an ideal redox-responsive group, hydrophobic Fc can be easily oxidized into hydrophilic Fc+ by certain oxidants, providing tremendous opportunities to produce various Fc-containing redox-responsive materials. On the other hand, the pH/CO2-responsive reversible nature of the DEAE group makes it possible to construct a smart system to adapt to the complex environment in practical application. The stimuli-responsive aggregation behavior of the well-defined poly(Fc-DEAE-AM) homopolymer is examined by the combination of a fluorescent probe, UV/vis transmittance, zeta potential, transmission electron microscopy (TEM), and dynamic light scattering (DLS). In fact, due to the redox and pH/CO2-responsive character provided by the Fc and DEAE groups, the poly(Fc-DEAE-AM) homopolymer exhibits distinct phase transition in aqueous solution. In addition, such a homopolymer could form typical spherical particles in acid aqueous solution, and the redox agent could lead to changes in the size and morphology of the aggregates. Thus, we provide a new and efficient way to prepare triple-stimuli-responsive Fc-containing homopolymers, which might be used as interesting building block for the fabrication of multiple stimuli-responsive functional materials.