【摘要】 以4,4’-二羟基二苯醚、对硝基氯苯为原料,缩合制得4,4’-二(4-硝基-苯氧基)二苯醚,后采用水合肼还原得到4,4’-二(4-氨基-苯氧基)二苯醚(BAPE)单体;将其与PMDA(均苯四甲酸二酐)通过缩聚反应、热环化制备了一种多苯氧基型聚酰亚胺。结果表明:缩合制备4,4’-二(4-硝基-苯氧基)二苯醚,收率达到99.3%以上。还原制备4,4’-二(4-氨基-苯氧基)二苯醚(BAPE)单体,熔点125.9~126.8℃,母液回用后收率达85.9%以上。此种单体制备的聚酰亚胺玻璃化转变温度达280.8℃,具有较高的耐热性能,拉伸强度达到99.67 MPa,断裂伸长率为17.32%,是一种性能优良的材料。更多还原

【Abstract】 Under the catalysis of catalyst 4,4’-dihydroxy diphenyl ether,the 4,4’-bis(4-nitro phenoxy) was prepared.The diphenyl ether(BAPE-M,yield: ≥ 99.3%) was synthesized in etherification reaction from 4,4’-dihydroxy diphenyl ether and p-chloronitrohenzene.Then BAPE-M was reduced into 4,4’-bis(4-amino phenoxy) diphenyl ether(BAPE) by hydrazine hydrate.Moreover,BAPE/PMDA-PAA polyamide acid was polymerized between BAPE and pyromellitic dianhydride(PMDA),and further imidized into BAPE/PMDA-PI polyimide by heating.The results were obtained as follows: the yield of BAPE is over 85.9%.The DSC spectra show that the glass transition temperature of the polyimide is about 280.8 ℃,the tensile strength is 99.67 MPa,and the elongation at break is 17.32%.The PI(BAPE/PMDA) will be a fine material for its higher thermal property.更多还原