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首页> 外文期刊>ACS Macro Letters >Aqueous Polymerization-Induced Self-Assembly for the Synthesis of Ketone-Functionalized Nano-Objects with Low Polydispersity
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Aqueous Polymerization-Induced Self-Assembly for the Synthesis of Ketone-Functionalized Nano-Objects with Low Polydispersity

机译：水聚合诱导自组装合成低多分散性的酮基官能化纳米物体

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摘要

Efficient synthesis of functionalized, uniform polymer nano-objects in water with controlled morphologies in one step and at high concentrations is extremely attractive, from perspectives of both materials applications and industrial scale-up. Herein, we report a novel formulation for aqueous reversible addition fragmentation chain transfer (RAFT) dispersion polymerization based on polymerization-induced self-assembly (PISA) to synthesize ketone-functionalized nano-spheres and vesicles. Significantly, the core-forming block was composed entirely of a ketone-containing polymer from a commodity monomer diacetone acrylamide (DAAM), resulting in a high density of ketone functionality in the nano-objects. Producing uniform vesicles represents another challenge both in PISA and in the traditional self-assembly process. Aiming at producing uniform nano-objects, especially vesicles, in such a highly efficient aqueous PISA process, we devised strategies to allow sufficient time for the in situ generated polymers to relax and reorganize into vesicles with a remarkably low polydispersity. Specifically, both reducing the radical initiator concentration and lowering the polymerization temperature were shown to be effective for improving the uniformity of vesicles. Such an efficient, aqueous PISA to produce functionalized and uniform nano-objects with controlled morphologies at solid contents up to 20% represents important progress in the field.
机译：从材料应用和工业规模发展的角度来看，一步法以高浓度在水中以受控的形态高效合成功能化，均匀的聚合物纳米物体极具吸引力。在本文中，我们报告了一种基于可聚合的自组装（PISA）合成酮基官能化的纳米球和囊泡的水性可逆加成断裂链转移（RAFT）分散聚合的新配方。重要的是，成核嵌段完全由商品单体双丙酮丙烯酰胺（DAAM）中的含酮聚合物组成，从而在纳米物体中产生了高密度的酮官能团。在PISA和传统的自组装过程中，产生均一的囊泡是另一个挑战。为了在这种高效的水性PISA工艺中生产均匀的纳米物体，尤其是囊泡，我们设计了策略，以留出足够的时间使原位生成的聚合物松弛并重组为具有明显较低的多分散性的囊泡。具体地，降低自由基引发剂的浓度和降低聚合温度均显示出对改善囊泡的均匀性有效。这种有效的水性PISA可以生产固形物含量高达20％的具有受控形貌的功能化且均匀的纳米物体，这是该领域的重要进展。

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