一种含假芪型偶氮生色团两亲性嵌段共聚物的合成与表征

利用原子转移自由基聚合（ATRP）合成了一种新型的含假芪型偶氮生色团的两亲性嵌段共聚物P（HEMA-b-6CNAzo）。首先，采用ATRP引发剂引发三甲基硅保护的羟乙基甲基丙烯酸酯（HEMA—TMS）聚合，得到大分子引发剂P（HEMA—TMS）；接着进一步引发单体甲基丙烯酸6-（N_甲基苯胺基）己酯进行ATRP反应，得...

Synthesis and Characterization of a Novel Amphiphilic Azo Block Copolymer

A novel amphiphilic block copolymer functionalized with strong push-pull azobenzene moieties,P(HEMA-b-6CNAzo),was synthesized by using ATRP.First,the macromolecular initiator P(HEMA-TMS) was prepared through ATRP reaction of monomer HEMA-TMS,which was hydroxylethyl-mathacrylate(HEMA) protected with trimethylsilane(TMS) groups.Then,the precursor diblock copolymer,P(HEMA-TMS-b-6MA),containing aniline groups was prepared by a P(HEMA-TMS)-initiated ATRP of 6-(N-methylanilino)hexyl methacrylate.The amphiphilic azo block copolymer,P(HEMA-b-6CNAzo),was obtained by azo-coupling reaction between P(HEMA-TMS-b-6MA) and diazonium salt of 4-aminobenzonitrile and the TMS groups were removed at the same time because of the acidic conditiond.The macro-initiator and block copolymers were characterized by GPC,1H-NMR and UV-vis.GPC results showed that both P(HEMA-TMS) and P(HEMA-TMS-b-6MA) had narrow molecular weight distributions.1H-NMR analysis indicated that the ratio of polymerization degree for HEMA andP6MA blocks is 0.95∶1.The conversion rate of azo-coupling reaction and hydrolysis of TMS groups were close to 100%.By adding deionized water under a rate of 1μL/s to a THF solution of P(HEMA-b-6CNAzo) with the concentration of 0.2g/L,the amphiphilic block copolymers self-assembled to form colloidal spheres with sizes in range from 60 and to 80nm.