Synthesis, characterization, and photoresponsive behavior of a series of azobenzene-containing side-chain poly(ether sulfone)s with various lengths of flexible spacers
作者:Yuxuan Zhang、Songhao Pei、Yongpeng Wang、Zengduo Cui、Na Li、Ye Zhu、Haibo Zhang、Zhenhua Jiang
DOI:10.1016/j.dyepig.2013.08.004
日期:2013.12
A series of azobenzene-containing side-chain poly(ether sulfone)s (azo-PES) with various spacer lengths (2, 6 or 12 methylene units) were successfully synthesized via a nucleophilic substitution grafting reaction between poly(ether sulfone)s with hydroxylphenyl side groups and azobenzene monomers. Their chemical structures and properties were characterized by means of IR, UV–vis and 1H NMR. These azo-polymers
通过聚(醚砜)与聚(醚砜)之间的亲核取代接枝反应成功地合成了一系列具有不同间隔长度(2个,6个或12个亚甲基单元)的含偶氮侧链聚(醚砜)(偶氮PES)。羟苯基侧基和偶氮苯单体。通过IR,UV-vis和1对它们的化学结构和性质进行了表征。1 H NMR。这些偶氮聚合物在玻璃化转变温度和119°C和347°C以上的5%失重温度下表现出良好的热稳定性。光异构化实验的结果表明,具有更长间隔基的偶氮-PES聚合物对应于更高的光异构化速率。在用532 nm掺钕钇铝石榴石(Nd:YAG)激光束照射时,它们呈现出的双折射残余值大于双折射饱和值的82%,表明光诱导取向的良好稳定性。在几次刻写-擦除-刻写序列循环之后,未观察到疲劳现象。