Unveiling Aqueous Polymerization of Aromatic Poly (amic acid) Salts for Eco-friendly and Robust Polyimide Structuring
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Aqueous polymerization of aromatic poly(amic acid) salts (PAAS) is attracting attention in polyimide (PI) research due to its facile and eco-friendly process. However, chemical diversity and the properties of products are limited due to unclear mechanisms. Here, we report the reaction mechanism of water-borne PAAS (W-PAAS) polymerization. The exposed functional group is densified by salt-forming between the organic base and dianhydride, which affects to initiation of the reaction. It is revealed that the reaction follows quasi-interfacial polymerization which is occurred at the interface of dianhydride particles. The properties of PI films derived from the W-PAAS solution showed on par with commercial PI films. Furthermore, we used W-PAAS hydrogel as an eco-friendly ink to fabricate a robust and desired 3D structure through the direct ink writing technique. This study provides a new platform of rational molecular design for aqueous synthetic systems as well as extending applications.