, Volume 69, Issue 6, pp 675-684
Date: 15 Apr 2012

Preparation of hierarchical polyimide hollow spheres via a gas bubble templated transimidization induced crystallization process

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Abstract

Hierarchical polyimide hollow spheres consisting of crystalline nanoparticles were synthesized by a novel gas bubble templated transimidization induced crystallization process. The morphologies of the hollow spheres can be fine-tuned by changing the concentrations and the chemical structure of the monomers. Based on the experimental results, a possible formation mechanism of these polyimide hollow spheres was proposed based on the aggregation of the primary crystalline polyimide nanoparticles on the in situ formed gas bubbles as soft templates to minimize the interfacial energy.