SiO_2和LiBr固体无机盐致孔剂制备多孔聚酰亚胺微球

Preparation of porous polyimide microspheres with SiO_2 and Li Br solid inorganic agents

在非水乳液体系中,以两步法为基础,采用固体无机盐(Si O2、Li Br)为致孔剂,经与聚合物PI结合、占位、脱除等步骤后成功制得多孔PI微球。通过红外光谱(FT-IR)、扫描电子显微镜(SEM)等手段来表征产物的化学结构和微观形貌。对于PI微球的球形和孔结构,从致孔剂的种类、加入时间和加入方式等方面进行了探讨。研究表明,2种无机盐对PAA亚胺化程度几乎没有影响,以溶液形式在聚合后加入反应体系,制得球形形貌最佳。与Li Br相比,Si O2致孔效果更好。

Based on the two-step imidization, a polyimide （PI） microsphere is successfully prepared in non-aqueous emulsion through interaction and occupation of PI by solid LiBr and SiO2 porogens which are subsequently removed. Infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM） are used to study the chemical structure and morphology of PI mierosphere. The effects of porogen types, the time and ways of adding porogens on the sphere and pore structures of PI microspheres are investigated. The results show that LiBr and SiO： porogens have no effect on the conversion from PAA to PI. The pore morphology is much better when solid inorganic agents, LiBr and SiO2 , are poured into emulsion system in solution form. And the pore effect of SiO2 is better than that of LiBr.