Selective Incorporation of Palladium Nanoparticles into Microphase-Separated Domains of Poly(2-vinylpyridine)-block-polyisoprene

Fine palladium (Pd) particles, which have a diameter of 4−5 nm and are coordinated with the poly(2-vinylpyridine) homopolymer (P2VP) or poly(2-vinylpyridine)- block -polyisoprene diblock copolymer (P2VP- b -PI), were prepared by the reduction of palladium acetylacetonate (Pd II (acac) 2 ) with 1-propanol in the dilute benzene solution of P2VP or P2VP- b -PI. These Pd “nanoparticles” were selectively incorporated into a particular region of microdomains by casting a solution comprised of the Pd nanoparticles, P2VP- b -PI, and chloroform as a solvent into film specimens. The nanoparticles coordinated with P2VP were selectively incorporated into the P2VP domains, while those coordinated with P2VP- b -PI were around the interface between the P2VP and PI domains.