反相非水乳液法制备聚酰亚胺微球
发布时间：2019-07-06 16:15
【摘要】：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.
[Abstract]:In N, N-dimethyl formamide (DMF) / Pluronic-F127, sodium lauryl benzene sulfonate (SDBS) / liquid paraffin (LP) reversed anhydrous emulsion system, polyamide acid (PAA), was synthesized from (PMDA) and 4, 4 / 4 diaminodiphenyl ether (ODA) by pyridine / acetic anhydride dehydrating agent. PAA chemical imidization and further thermal imidization were used to prepare PI heat-resistant microspheres. The products were characterized by infrared spectroscopy, thermogravimetric analysis and scanning electron microscope. The results show that high solid content and good emulsion dispersion are beneficial to the formation of PI microspheres, and the stable proportion conditions of reverse aqueous emulsion system are as follows: VDMF:VLP is 1: 4, MF127 / MSDBS is 3? 2, emulsifier dosage is 9 wt%; Under this condition, when the solid content is 20% and the thermal imidization temperature is not higher than 330 鈩，
本文编号：2511155
[Abstract]:In N, N-dimethyl formamide (DMF) / Pluronic-F127, sodium lauryl benzene sulfonate (SDBS) / liquid paraffin (LP) reversed anhydrous emulsion system, polyamide acid (PAA), was synthesized from (PMDA) and 4, 4 / 4 diaminodiphenyl ether (ODA) by pyridine / acetic anhydride dehydrating agent. PAA chemical imidization and further thermal imidization were used to prepare PI heat-resistant microspheres. The products were characterized by infrared spectroscopy, thermogravimetric analysis and scanning electron microscope. The results show that high solid content and good emulsion dispersion are beneficial to the formation of PI microspheres, and the stable proportion conditions of reverse aqueous emulsion system are as follows: VDMF:VLP is 1: 4, MF127 / MSDBS is 3? 2, emulsifier dosage is 9 wt%; Under this condition, when the solid content is 20% and the thermal imidization temperature is not higher than 330 鈩，
本文编号：2511155
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