The Synthesis Of Branched Polymer Via SET-LRP

In this thesis, we was using2-(2-bromoisobutyryloxy) ethylacrylate as the inimer agent and methyl acrylate as the monomer. Thebranched PMA were carried out by single electron transfer livingradical polymerization (SET-LRP) at25°C and atom transfer radicalpolymerization (ATRP) at60°C, respectively. Then we prepared theblock copolymers PMA-b-PAA which has the pH-Responsiveproperty. Gas chromatography (GC), proton nuclear magneticresonance spectroscopy (1H-NMR), triple detection size exclusionchromatography (TD-GPC), fourier transform infrared spectroscopy(FT-IR), dynamic light scattering (DLS) and scanning electronmicroscope (SEM) were used to analyze the character ofpolymerization and the appearance of micelles.The monomer conversion can be up to90%in2hours when thebranched PMA was prepared by SET-LRP. However, the monomerconversion is only about60%at the same time when using the ATRPmethod. Using the SET-LRP method can be more convenient andfaster than ATRP to prepare higher branched PMA which has thehigher molecular weight.Then we was using the branched PMA which has wide molecularweight distribution and Multi-component, the linear PMA that hassingle component, the branched PMA which has single componentand narrow molecular weight distribution as the initiator separately,copolymerizing with tert-butyl acrylate to get a series ofPMA-b-PtBA. And we should make a hydrolysis reaction withtrifluoroacetic acid to prepare the amphiphilic copolymerPMA-b-PAA. Only the PMA-b-PAA (Mw.MALLS=88990) prepared bythe branched PMA which has single component and narrow molecularweight distribution can self-assemble into rod-like micelles that havesmooth surface and uniform size. The concentration of the solution is0.05mg/mL and pH=1.58. Expanded the research which we can usethe random molecular molecules self-assemble into the regular structure aggregates.