Synthesis and Characterization of Organosoluble Copolyimides Based on 3,3′,4,4′-Diphenylsulfonetetracarboxylic Dianhydride and a Pair of Aromatic Diamines Containing 1,2-Bis(4-Aminophenoxy)-4-<i>tert</i>-Butylbenzene
作者:Chin-Ping Yang、Ruei-Shin Chen、Ming-Jui Wang
DOI:10.1002/jccs.200300016
日期:2003.2
A series of copolyimides was synthesized from commercial 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride with a pair of diamines, which contained 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene. The intermediate poly(amic acid)s had the inherent viscosities of 0.52–1.52 dL/g and were thermally converted into copolyimides. These copolymers were soluble in a variety of organic solvents such as NMP,
由市售的 3,3',4,4'-二苯砜四羧酸二酐与一对含有 1,2-双(4-氨基苯氧基)-4-叔丁基苯的二胺合成了一系列共聚酰亚胺。中间体聚(酰胺酸)的特性粘度为 0.52-1.52 dL/g,可热转化为共聚酰亚胺。这些共聚物可溶于NMP、DMAc、DMF等多种有机溶剂,甚至几乎都可溶于间甲酚、吡啶、二恶烷等极性较小的溶剂,溶解度优于相应的均聚物. 共聚酰亚胺薄膜的拉伸强度为 87-160 MPa,断裂伸长率为 9-12%,初始模量为 1.9-2.2 GPa。这些共聚物的玻璃化转变温度在 262–288 °C 范围内,低于均聚物。共聚酰亚胺在氮气下 495–522 °C 和空气气氛下 508–521 °C 的范围内具有 10% 的失重温度,即使在 800 °C 的氮气中它们留下超过 43% 的残留物。由于共聚作用,共聚物的热稳定性有所牺牲,但仍属于耐热聚合物材料。