STUDY ON SYNTHESES AND PROPERTIES OF SOME NOVEL POLYIMIDES CONTAINING BISTHIAZOLE RINGS

Some nove polyimides containing bisthiazole rings were prepared by reacting 2,2'-diamino-4, 4'-bisthiazole (DABT) with different aromatic dianhydride. The polyimidesobtained had inherent viscosities of 0.37--0.82 dl/g. Thermogravimetric analysis of thepolyimides showed good thermal stability the temperature at 5% weight loss being from450°to 560℃. The permeability of two polymer membranes to H_2, O_2 and N_2 was deter-mined, respectively Three kinds of polyimide films were converted into electrical conductorby pyrolysis at high temperature in nitrogen atmosphere. The maximum room tempera-ture conductivity as high as 3.9×10~2 S/cm for PI film pyrolyzed at 1200℃ for 10min wasobtained, and it was very stable in air.     

三苯胺多枝化合物光谱性能的研究

研究了含三苯胺多枝化合物——4-正丁氧基苯乙烯三苯胺(T1)、双(4-正丁氧基苯乙烯)三苯胺(T2)和三(4-正丁氧基苯乙烯)三苯胺(T3)溶液的光谱行为.结果发现:在三苯胺对位进行单枝化(T1)、双枝化(T2)和三枝化(T3)后,摩尔吸光系数增大且最大吸收波长红移,但红移幅度依次减小,表明经多枝化处理后分子能带带隙趋于接近.在不同的溶剂中,T1—T3荧光行为有所不同:在环己烷中相对荧光强度的顺序为T3>T2>T1;随着溶剂极性增大,荧光强度顺序发生反转,为T1>T2>T3.量子产率数值(φ_f)表明,随着溶剂的极性增大,T1和T2、T3的量子产率变化顺序也不同:T1的φ_f值随溶剂极性的增大而增大,而T3的φ_f值则基本是随着溶剂极性的增大而依次减小.造成这种差别的原因可能是ICT和TICT两发光态在极性不同的溶剂中相互转化、平衡移动所致.     

SYNTHESIS AND REACTIONS OF SOME NEW HETEROCYCLIC COMPOUNDS CONTAINING THE THIENYLTHIENO[2,3-B]PYRIDINE MOIETY

(4-Aryl-3-cyano-6-(2-thienyl)pyridin-2-ylthio)acethydrazides (5a–c), 3-amino-4-aryl-6-(2-thienyl)thieno[2,3-b]pyridine-2-carbohydrazides (6a–c) and 3-amino-4-phenyl-6-(2-thienyl)thieno[2,3-b]pyridine-2-carboxylic acid (30) were prepared and employed as key intermediates in the synthesis of the title compounds.