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以3,5-二氨基苯甲酸十六醇酯(DBAAE)与醚类二胺按一定比例与四甲酸二酐共聚,得到支链化聚酰亚胺酸PIE-(1—3)系列,其中100%的DBAAE与四甲酸二酐聚合得到聚酰亚胺酸PID,将PID高温脱水环化制得可溶性PI添加到PIE-3中得到聚酰亚胺酸PIE-3a。通过红外、溶解性、膜韧性、TG、预倾角测试以及工业可靠性实验等手段对所制备的材料进行了结构与性能表征。研究表明:当DBAAE单体占总胺含量的30%时,固化后的PI膜柔韧性良好并且具有很好的溶解性能。PI随着支链化的增加,其热稳定性虽然逐渐下降但仍然十分优异。可溶性PI的加入使酰亚胺化率显著提高,用于液晶显示材料时,预倾角可达到4°～4.5°,并且工业可靠性测试结果优良。
The copolymerization of tetracarboxylic dianhydride with DBAAE and ethers of diamine in a certain ratio gave PIE- (1-3) series of branched polyimides, in which 100% of DBAAE and tetracarboxylic dianhydride were polymerized to obtain a polyimidic acid PID, and the PID was dehydrated and cyclized to obtain soluble PI to PIE-3 to obtain polyimidic acid PIE-3a. The structure and properties of the prepared materials were characterized by infrared, solubility, film toughness, TG, pre-tilt angle test and industrial reliability experiments. The results show that: when the DBAAE monomer accounts for 30% of the total amine content, the cured PI film has good flexibility and good solubility. With the increase of branching, the thermal stability of PI gradually decreases but it is still very good. Addition of soluble PI resulted in a significant increase in the imidization rate. When used in liquid crystal display materials, the pretilt angle can reach 4 ° -4.5 °, and the industrial reliability test results are excellent.