【摘要】 以2,4,2′-三羟基偶氮苯、丁二酸为原料,首先将丁二酸转化为丁二酰氯,利用酰氯基团与羟基的反应活性,通过A2+B3方法合成超支化偶氮聚酯。采用红外光谱等表征了聚合物的结构,通过UV-Vis光谱研究了偶氮聚合物的光致变色特性。结果表明,超支化偶氮聚酯π-π*跃迁最大吸收峰和单体2,4,2′-三羟基偶氮苯一致,且不受聚合物结构的影响,反-顺异构化反应速率随聚合物结构中偶氮基元的增加而增加,并大于偶氮苯单体的光异构反应速率。热分析表明,合成聚合物在200℃以内具有较好的热稳定性。更多还原

【Abstract】 Starting from 2,4,2′-trihydroxy azobenzene and succinic acid, the hyperbranched azo polyester was synthesized by the reaction of succinyl chloride and hydroxy via A2 + B3 polycondensation. The structure of the hyperbranched azo polyester was characterized by IR, TG, and its photochromic property was tested by UV-Vis spectrum. The results reveal that the hyperbranched azo polyester and 2,4,2′-trihydroxy azobenzene has the sameπ-π* warp maximum absorption peak, which does not be affected by the structure of the polymer. With the increasing of azo unit in polymer, the reaction rate of trans-cis isomerization which is larger than that of the monomer increases. The target polymer has a good thermal stability within 200℃.更多还原