Polypyridine grafted with poly (ethylene glycol) copolymers (Py-g-PEG) with varying composition were prepared through radical copolymerization of methyl-terminated PEG macromonomer and 4-pyridylmethyl methacrylate, and the obtained copolymer spontaneously adsorbs from aqueous solution onto gold surfaces, where the pyridine parts act as the multipoint anchor to the surface and the PEG parts provide the strong steric repulsion between the chains. As a result, the highly protein repellent and stable surface was constructed through multipoint pyridine attachment as compared with singlepoint pyridine attachment. Furthermore, the property of multimolecular micellization for the obtained copolymer in aqueous milieu was examined to estimate the relation between the surface properties on the substrate and the self-assembling ability in aqueous milieu. Py-g-PEGs thus prepared are promising materials to functionalize metal and semiconductor materials and to self-assemble into micelles in biotechnological and biomedical fields.
An alternating manganese-phenylene-rhenium ternary hybrid copolymer was synthesized by initially reacting rhenium chloride with 4-hydroxythiophenol followed by a second reaction with manganese chloride. UV-VIS, ESR, and XPS spectral measurements suggest that an electron transfer takes place from the rhenium atom to the manganese atom via the phenylene group with the partial reduction of the manganese atom.
Composite nanoparticles of polyester resin with pigment were prepared by phase-inversion emulsification followed by dry-in-liquid method. In the experiment, the effects of the impeller speed at the phase inversion, the concentration of emulsifier, and the amphiphilic solvent on the characteristics of composite particles containing carbon black as a colorant were investigated. Monodispersed composite particles with the mean diameter of 120 nm were able to be prepared by using polyoxyethylen lauryl ether as an emulsifier and acetone as an amphiphilic solvent.