Abstract

A new class of polyimides had been synthesized from a novel aromatic diamine, 2',7'-bis(4-aminophenoxy)-spiro(4,5-diazafluoren-9,9'-xanthene). Polyimides were prepared by two-stage polycondensation of diamine monomer with various aromatic dianhydride. These polymers showed good thermal stability, solubility and optical transparency. These polymers showed good thermal stability, solubility and optical transparency. Except 6a, all polyimides were dissolved in aprotic polar solvents at room temperature. The glass transition temperatures (T_g) of the poly(ether imide)s were determined to be 338–423 °C and 345–428 °C by dynamic mechanical thermal analyses (DMA) and differential scanning calorimeter (DSC), respectively. Decomposition temperature for 10% weight loss all of these poly(ether imide)s above 560 °C in both nitrogen and air atmospheres. Normalized transparencies in the visible region (400–780 nm) were recorded between 67% and 83%. The dielectric constants of polyimide film were recorded in the range of 2.56–3.12 at 1 KHz.

摘要

一类新的聚酰亚胺由新型芳族二胺合成，2',7'-双（4-氨基苯氧基）-螺（4,5-二氮杂芴-9,9'-呫吨）。聚酰亚胺是通过二胺单体与各种芳族二酐的两阶段缩聚反应制备的。这些聚合物显示出良好的热稳定性、溶解性和光学透明度。这些聚合物显示出良好的热稳定性、溶解性和光学透明度。除 6a 外，所有聚酰亚胺均在室温下溶解在非质子极性溶剂中。玻璃化转变温度 ( T _g) 通过动态机械热分析 (DMA) 和差示扫描量热仪 (DSC) 分别确定为 338–423 °C 和 345–428 °C。在氮气和空气气氛中，所有这些聚（醚酰亚胺）的分解温度均高于 560°C，重量损失 10%。可见光区（400-780 nm）的标准化透明度记录在 67% 到 83% 之间。聚酰亚胺薄膜的介电常数在 1 KHz 下记录在 2.56-3.12 的范围内。