Synthesis and Self-Assembly of Block Polyelectrolyte Membranes through a Mild, 2-in-1 Postpolymerization Treatment
Synthesis and Self-Assembly of Block Polyelectrolyte Membranes through a Mild, 2-in-1 Postpolymerization Treatment
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DOI：
10.1021/acsapm.9b01100
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发表时间：
2020-02-01
影响因子：
5
通讯作者：
Hillmyer, Marc A.
中科院分区：
文献类型：
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作者：
Goldfeld, David J.;Silver, Eric S.;Hillmyer, Marc A.
含有空间上分离的正电荷和负电荷的嵌段聚合物系统对于许多应用是期望的，包括生物医学装置、膜分离和涂层。不幸的是，正嵌段聚合物和负嵌段聚合物的电荷消除和形成不溶性凝聚沉淀的趋势导致在带电薄膜的制造中的加工困难。我们使用后聚合改性，同时添加负和正电荷的自组装中性ABC三嵌段聚合物薄膜。采用可逆加成-断裂链转移聚合法合成了聚苯乙烯磺酸正丙酯、聚对氯苯乙烯和聚乙烯基苄基氯三嵌段共聚物。两个带电块的化学官能化是通过在室温下暴露于气态三甲胺中的单一步骤同时完成的，简化了合成过程并保留了薄膜的微观结构。通过衰减全反射红外光谱跟踪定量功能化，并使用互调原子力显微镜，透射电子显微镜和掠入射小角度X射线散射的薄膜形态进行了评价。
Block polymer systems containing spatially separated positive and negative charges are desirable for a number of applications, including biomedical devices, membrane separations, and coatings. Unfortunately, the tendency of positive and negative block polymers to charge cancel and form an insoluble coacervate precipitate leads to processing difficulties in the fabrication of charged thin films. We use postpolymerization modifications to simultaneously add both negative and positive charges to self-assembled neutral ABC triblock polymer thin films. Using reversible addition fragmentation chain transfer polymerization, we synthesized triblock terpolymers consisting of poly(n-propyl styrene sulfonic ester), poly(4-chlorostyrene), and poly(vinylbenzyl chloride). The chemical functionalization of both charged blocks was accomplished simultaneously through exposure to gaseous trimethylamine in a single step at room temperature, simplifying the synthetic procedure and preserving the microstructure of the thin film. The quantitative functionalization was tracked through attenuated total reflectance infrared spectroscopy, and the thin film morphology was evaluated using intermodulation atomic force microscopy, transmission electron microscopy, and grazing-incidence small-angle X-ray scattering.