聚-1,3,5-三嗪的合成及性能

将联苯二脒与苯甲醛或其盐酸盐与乙酸酐进行缩聚反应,合成了两种新的聚-1,3,5-三嗪,用元素分析、红外光谱、差热分析及热重分析进行了表征,聚合物的η_(比粘)为0.46—0.56分升/克(1％硫酸,25℃),具有良好的耐温性和耐水解性,也有一定的溶解性,利用这种聚-1,3,5-三嗪和二氯化钯反应,可以制成新的高分子络合物。

PREPARTATION AND PROPERTIES OF POLY-1, 3, 5-TRIAZINES

Two new polytriazines: poly [2-methyl-4,6-(4',4" -diphenylene)-1,3,5-triazine] (Ⅰ) dan Poly [2-phenyl-4, 6-(4', 4"-diphenylene)-1, 3, 5-triazine] (Ⅱ) were synthesized from the solution condensation of biphenyl-4, 4'-diamidine dihydrochloride with acetic anhydride and biphenyl-4,4'-diamidine with benzaldehyde respectively. These two polymers were characterized by TGA, DTA, elemental analysis and IR spectroscopy. They exhibited good thermal oxidative stability as shown by the fact that the powders of these polymers suffered 5.4%, 2.4% weight loss after isothermal aging in air at 300℃ for 200 hours. The decomposition temperature of (Ⅱ) was 583℃ in air and 590℃ in N2. In comparison, the linear poly-1,3,5-triazine as mentioned above were soluble in concentrated sulfuric acid, phosphoric acid and trifluoroacetic acid whereas the crosslinked poly-l,3,5-triazines which have been reported in the literature were insoluble and infusibleIt is interesting that these polymers can be formed into complexes with PdCl2. as determined by X-ray photoelectron spectroscopy (XPS). The polymer complex (Ⅲ) PdCl2, where (Ⅲ) is poly [2-methyl-4,6-(1,4-phenylene)-1,3,5-triazine], possesses catalytic activity for hydrogenation.