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在N,N-二甲基甲酰胺(DMF)/Pluronic-F127、十二烷基苯磺酸钠(SDBS)/液体石蜡(LP)反相非水乳液体系中,以均苯四甲酸二酐(PMDA)和4,4′-二氨基二苯醚(ODA)为单体合成聚酰胺酸(PAA),采用吡啶/乙酸酐脱水剂,对PAA化学酰亚胺化,并进一步热酰亚胺化,制得PI耐热微球.产物通过红外、热重、扫描电镜表征.结果表明,较高的固含量和良好的乳液分散性有利于PI微球的形成;反相非水乳液体系稳定的配比条件是,VDMF∶VLP为1∶4,MF127∶MSDBS为3:2,乳化剂用量为9 wt%;在此配比条件下,当固含量为20%,热酰亚胺化温度不高于330℃时,可制得分散良好、球形规整、高热稳定性的PI微球,其粒径约为10μm.
In the system of N, N-dimethylformamide (DMF) / Pluronic-F127, sodium dodecyl benzene sulfonate (SDBS) / liquid paraffin (LP) (PMDA) and 4,4’-diaminodiphenylether (ODA) as monomers, PAI was chemically synthesized from PAA using pyridine / acetic anhydride dehydration agent, and further thermal imide The PI heat-resistant microspheres were prepared.The products were characterized by IR, TG and SEM.The results showed that the higher solid content and the good dispersibility of the emulsion were beneficial to the formation of PI microspheres. The reversed-phase non-aqueous emulsion system was stable , The ratio of VDMF: VLP was 1: 4, MF127: MSDBS was 3: 2, and the amount of emulsifier was 9 wt%. Under this condition, when the solid content was 20%, the thermal imidization temperature Not more than 330 ℃, can be prepared well dispersed, spherical regulation, high thermal stability of PI microspheres, the particle size of about 10μm.