化学亚胺化合成含吡啶环共聚聚酰亚胺

用2，2-双4-（4-氨基苯氧基）苯基]丙烷（BAPP）和4-苯基-2，6-双（4．氨基苯基）吡啶（PBAP）作为二胺，3，3’，4，4＇-二苯酮四酸二酐（BTDA）作为二酐，以N，N-二甲基甲酰胺（DMF）为溶剂，合成了3种聚酰亚胺。先用BAPP和PBAP同BTDA反应生成一系列聚酰胺酸（PAA），然后将得到的PAA用化学亚胺化制备相应的聚酰亚胺。用FT-IR、^1H—NMR、粘度测试、溶解性测试和TGA对聚合物的结构和性能进行了表征。结果表明，FT—IR测试在1780cm^-1、1720cm^-1和725cm^-1左右出现了聚酰亚胺的特征吸收峰，所得聚酰胺酸的特性粘数为0．32～0．46dL／g，大部分聚酰亚胺在常见有机溶剂NMP中可溶，它们有很好的热稳定性，氮气氛中，在500℃以前没有明显的降解。

Synthesis of pyridine-containing copolyimide via chemical imidization method

Three kinds of polyimides were synthesized by using 2,2-bis4-(4-aminophenoxy) phenyl]propane (BAPP) and 4-phenyl-2,6-bis(4-aminophenyl) pyridine(PBAP) as the diamine monomer,3,3',4,4'-benzophe-nonetetracarboxylic dianhydride(BTDA) as the dianhydride monomer in dimethylformamide(DMF).The BAPP and PBAP reacted with BTDA to prepare a series of polyamic acid(PAA),meanwhile,corresponding polyimides were obtained via chemical imidization procedures of the resulting PAA.The structure and performance of polymer were characterized by FT-IR、~1H-NMR、viscosity testing、solubility testing and TGA.The results show that there were characteristic peaks of polyimides around 1 780 cm~(-1)、1720 cm~(-1) and 725 cm~(-1) tested by FT-IR.The inherent viscosities of the resulting poly(amic acid) s were in the range of 0.32～0.46 dL/g,and most of polyimides were soluble in common organic solvents such as NMP.They had good thermal stability and did not show significant decomposition before 500℃in nitrogen atmosphere.