含强推拉电子型偶氮苯的嵌段共聚物合成与自组装研究

利用原子转移自由基聚合(ATRP)和前体聚合物重氮偶合反应相结合的方法,制备了一种新型含强推拉电子型偶氮苯的嵌段共聚物PEG-b-P6CNAzo.首先使用大分子引发剂PEGBr引发单体甲基丙烯酸6(N-甲基苯胺基)己酯进行ATRP聚合,得到作为前体聚合物的两嵌段共聚物PEG-b-P6MA,然后再与4-氰基苯胺的重氮盐进行重氮偶合反应得到目标产物PEG-b-P6CNAzo.利用GPC1、H-NMR、UV-Vis等手段对制得的聚合物进行了详细的表征.1H-NMR分析结果表明PEG-b-P6MA的聚合度为122-b-13,重氮偶合反应转化率接近100%.GPC结果表明PEG-b-P6MA与PEG-b-P6CNAzo均具有较窄的分子量分布.向浓度为0.2 g/L的PEG-b-P6CNAzo四氢呋喃溶液中以0.5 mL/h速率加水,该嵌段共聚物可以形成直径约11 nm的棒状胶束.

SYNTHESIS AND AGGREGATION BEHAVIOR OF AN AMPHIPHILIC BLOCK COPOLYMER WITH STRONG PUSH-PULL AZO CHROMOPHORES ON SIDE CHAINS

An amphiphilic block copolymer functionalized with strong push-pull azobenzene moieties,PEG-b-P6CNAzo,was synthesized through a scheme that combined ATRP and post-polymerization azo-coupling reaction.First,the precursor diblock copolymer,PEG-b-P6MA,containing aniline groups was prepared by a PEGBr initiated ATRP of monomer 6-(N-methylanilino)hexyl methacrylate.Then PEG-b-P6CNAzo was obtained through azo-coupling reaction between PEG-b-P6MA and diazonium salt of 4-aminobenzonitrile.The azo block copolymer wa...