Abstract
Front Cover: In article number 2100197, Huawei Zou, Shengtai Zhou, and co-workers show that hollow polyimide (PI) microspheres with controllable sizes can be obtained by a powder foaming process combined with a gradient heating strategy. A linear correlation between the size of PI microspheres and polyester ammonium salt precursor particles is established. This method is easily implemented which can be scaled at large quantities for potential industrial applications.
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