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PVP played roles of nucleation, balling and dispersion respectively in the whole process. The polyimide microspheres could be prepared in the micro-scale by this way.
PVP在制备过程中分别呈现出成核、成球及分散稳定的作用， 从而实现了聚酰亚胺材料在微米尺度上的微球化。
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