A thermo-, pH- and cyclodextrin- (CD) responsive poly(N-isopropylacrylamide) (PNIPAM), with a N,N-dimethylaminoazobenzene end group was synthesized. Using 3-mercaptopropionic acid as a chain transfer agent, PNIPAM with a well-defined COOH end group was obtained. The acid end group was transferred to the corresponding acid chloride and then functionalized with N,N-dimethyl[4-(4’-aminophenylazo)phenyl]amine. This dye-end-group-labeled polymer showed acidochromic effects, depending on the pH and the presence of randomly methylated β-cyclodextrin (RAMEB-CD). Also higher cloud-point values for the lower critical solution temperature (LCST) in the presence of RAMEB-CD were observed. Additionally, this azo-dye-end-group-labeled polymer was complexed with hyperbranched polyglycerol (HPG) decorated with β-CD to generate hedgehog-like superstructures.
一个对热、pH和环糊精(CD)敏感的聚(异丙基丙烯酰胺)(PNIPAM),带有一个N,N-二甲氨基偶氮苯基末端基团的聚合物被合成。使用巯基丙酸作为链转移剂,得到了具有明确定义COOH末端基团的PNIPAM。将酸末端基团转移为相应的酸氯化物,然后与N,N-二甲基[4-(4'-氨基苯偶氮)苯基]胺进行功能化。这种染料末端基团标记的聚合物显示出酸性变色效应,取决于pH值和随机甲基化的β-环糊精(RAMEB-CD)的存在。此外,在RAMEB-CD存在的情况下观察到较高的临界溶解温度(LCST)的云点值。此外,这种偶氮染料末端基团标记的聚合物与装饰有β-环糊精的超支化聚甘油(HPG)复合,形成了刺猬状超结构。