Comparative study on polyimides from isomeric 3,3′-, 3,4′-, and 4,4′-linked bis(thioether anhydride)s
作者:Haibing Wei、Xueliang Pei、Xingzhong Fang
DOI:10.1002/pola.24681
日期:2011.6.1
infrared, NMR, and elemental analysis. Three series of polyimides (PIs) were prepared from the obtained isomeric dianhydrides and aromatic diamines in N‐methyl‐2‐pyrrolidone (NMP) via the conventional two‐step method. The PIs showed excellent solubility in common organic solvents such as chloroform, N,N‐dimethylacetamide, and NMP. Their glass‐transition temperatures decreased according to the order of PIs
三种异构的双(硫醚酐)单体,4,4'-双(2,3-二羧基苯硫基)二苯基酮二酐(3,3'-PTPKDA),4,4'-双(3,4-二羧基苯硫基)二苯基酮二酐通过多步反应制备了(4,4'-PTPKDA)和4-(2,3-二羧基苯硫基)-4'-(3,4-二羧基苯硫基)二苯基酮二酐(3,4'-PTPKDA)。它们的结构是通过傅立叶变换红外光谱,NMR和元素分析确定的。通过常规的两步法,从N-甲基-2-吡咯烷酮(NMP)中获得的异构体二酐和芳族二胺制备了三个系列的聚酰亚胺(PI)。PI在普通有机溶剂(如氯仿,N,N)中显示出极好的溶解性-二甲基乙酰胺和NMP。在3,3'-PTPKDA,3,4'-PTPKDA和4,4'-PTPKDA的基础上,它们的玻璃化转变温度根据PI的顺序降低。在504–519°C的温度下,所有PI在氮气中的失重温度均为5%(T 5%)。与4,4'-和3,4'-的相应异构体相比,基于3