Saloplastics as multiresponsive ion exchange reservoirs and catalyst supports
Saloplastics as multiresponsive ion exchange reservoirs and catalyst supports
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药性塑料作为多响应离子交换储存器和催化剂载体
DOI：
10.1039/d0ta05901c
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发表时间：
2020
影响因子：
11.9
通讯作者：
Ariga Katsuhiko
中科院分区：
文献类型：
--
作者：
Sciortino Flavien;Mir Sajjad Husain;Pakdel Amir;Oruganti Anjaneyulu;Abe Hideki;Witecka Agnieszka;Awang Shri Dayangku Noorfazidah;Rydzek Gaulthier;Ariga Katsuhiko
由压缩型聚电解质复合物（COPECs）组成的saloplastic是一种很有前途的方法，可以简单地组装多功能和可加工的聚合物基质。在这里，全面研究了盐塑性作为离子反应器设计催化剂的潜在应用。首先，通过研究由聚甲基丙烯酸（PMAA）和聚烯丙胺盐化（PAH）组装的copec内Na+和Cu2+阳离子交换的影响，阐明了saloplastics交换和浓缩离子的倾向。通过ATR-FTIR、ICP、XPS、DSC和TGA研究了PMAA/PAH COPECs在pH为3和4.5的CuCl2溶液中孵育的多尺度响应，通过SEM研究了形貌，通过应变断裂测量研究了力学性能。COPEC反应的振幅和动力学都受到PMAA链去质子化速率的驱动，这使得与Cu2+形成桥式配合物，并影响saloplastic的组成（含水量和聚电解质）、结构（大孔的出现）和力学性能。通过动力学调节PMAA/PAH copec中铜离子的质量浓度，实现了saloplastics作为反应器的使用。这种能力允许通过热退火来控制Cu(0)纳米颗粒在盐塑料中的生长，最终调节它们对一氧化碳（CO）氧化的催化活性。这项工作强调了在设计copec基材料的应用时，如何考虑盐基塑料的离子储层特性。
Developing saloplastics composed of Compacted Polyelectrolyte Complexes (COPECs) represents a promising strategy for assembling multifunctional and processable polymer matrices in a simple manner. Here, a comprehensive investigation of the potential application of saloplastics as ion reactors for designing catalysts has been performed. First the propensity of saloplastics to exchange and concentrate ions has been elucidated through investigating the influence of Na+ to Cu2+ cation exchange within COPECs assembled from poly(methacrylic acid) (PMAA) and poly(allylamine hydrochloride) (PAH). The multi-scale responses of PMAA/PAH COPECs upon incubation with CuCl2 solutions at pH 3 and 4.5 were investigated chemically by ATR-FTIR, ICP, XPS, DSC and TGA, morphologically by SEM, and mechanically by strain-to-break measurements. Both the amplitude and the kinetics of the COPEC response were driven by the deprotonation rate of PMAA chains, enabling the formation of bridge complexes with Cu2+ and impacting the saloplastic's composition (water content and polyelectrolytes), structure (emergence of macropores) and mechanical properties. Kinetic-based tuning of the molality of copper ions trapped in PMAA/PAH COPECs was demonstrated, enabling the usage of saloplastics as reactors. This ability allowed controlling the growth of Cu(0) nanoparticles in saloplastics by thermal annealing, ultimately adjusting their catalytic activity toward carbon monoxide (CO) oxidation. This work highlights how the ionic reservoir properties of saloplastics must be accounted for when designing the applications of COPEC-based materials.