摘要
以4,4′-二氨基偶氮苯、丁二酸为原料,首先将丁二酸转化为丁二酰氯,利用酰氯基团和氨基的反应活性,通过低温溶液缩聚法合成主链型偶氮聚酰胺。采用红外光谱、热分析等表征了聚合物结构,通过紫外-可见光谱研究了合成偶氮聚合物的光致变色性能。研究结果表明,合成的偶氮聚合物和单体在365nm紫外光照下均能实现较好的反-顺异构化转化,同时偶氮聚合物的π-π*跃迁最大吸收波长相对于单体发生了紫移,并随聚合物链中偶氮苯结构单元的减少,紫移波长增大。异构反应为一级动力学反应,且聚合物的反顺异构化反应速率比单体的大,并随着有机溶剂极性的增加而减小。
Starting from 4,4＇-azodianiline and succinic acid, the succinic acid was converted into succinyl chloride, then the main chain azo polyamide was synthesized by the reactivity of acyl chloride and amino via solution polycondensation. The structure of polymers was characterized by IR, TO and its photochromic property was tested by UV-Vis spectrum. The results show the synthesized polymers and monomer display good photoisomerization irradiated by UV light （λ = 365 nm）, the wavelength of the π-π＊ transition maximum absorption peak of polymers display blue shift comparing with monomer and increase with decreasing azobenzene units. The isomerization is a first-order reaction. The reaction rate of trans-cis isomerization of polymers is larger than that of monomer and decreases with increasing polarity of the organic solvents.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第9期23-27,共5页
Polymer Materials Science & Engineering
基金
广东省自然科学基金资助项目(S2011010001544)
高分子材料工程国家重点实验室开放课题基金资助(KF201208)
国家星火计划项目资助(2012GA780015)
关键词
偶氮苯
聚酰胺
合成
光致变色
azobenzene
polyamide
synthesis
photochromism
