POSS基两亲性嵌段共聚物的合成及自组装行为OA

Epoxy-based phenyl polyhedral oligomeric silsesquioxanes(POSS)were synthesized by hydrolytic condensation using different structures of triethoxysilanes as raw materials,and then POSS-based block copolymers(PEA-POSS)were synthesized by reaction of the amine group and epoxy ring-opening reaction with the polyether amine(PEA),and finally amphiphilic block copolymers(PEA-POSS-COOH)were synthesized by carboxylating the phenyl structure.The structural compositions of PEA-POSS-COOH were characterized using Fourier-transform infrared(FT-IR)and nuclear magnetic resonance hydrogen spectroscopy(1H-NMR).The PEA-POSS-COOH were self-assembled to form spherical micelles with hydrophobic POSS as the cores and hydrophilic PEA chains as the shell by the solvent evaporation-induced method.The morphology and structure properties of the assemblies were investigated by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),dynamic light scattering(DLS),small-angle X-ray scattering(XRD),and differential scanning calorimetry(DSC).These results show that the POSS-based amphiphilic block polymers can be assembled into spherical micellar structures with a particle size of about 1.14 μm,and the π-π stacking effect in the POSS structure makes the spherical micelles have a more stable structure with an increased melting point.