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

Abstract

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 (PdII(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.

Nanohybrids of Metal Nanoparticles and Block Copolymers. Control of Spatial Distribution of the Nanoparticles in Microdomain Space

“…Further details have been described elsewhere. 8 These two block copolymers listed in Table I were used not only for coordinating and stabilizing Pd but also for providing a matrix phase for Pd-(P2VP-b-PI), which is also a unique and novel point of this work.…”

“…This method, which has never been reported so far to our knowledge, involves firstly a preparation of Pd coordinated and stabilized by poly(2-vinylpyridine)-blockpolyisoprene (Pd-(P2VP-b-PI)) and secondly induces selfassembling of Pd-(P2VP-b-PI) and poly(2-vinylpyridine)-block-polyisoprene (P2VP-b-PI) forming the matrix phase for Pd via solvent casting with benzene. In our earlier report 8 we presented a method to prepare Pd-(P2VP-b-PI) of 4 to 6 nm in diameter. The self-assembly of Pd-(P2VP-b-PI) and P2VP-b-PI block copolymer with chloroform as a solvent was shown to create a nanohybrid in which Pd are selectively localized in the P2VP lamellae.…”

Effect of Areal Chain Density on the Location of Polymer-Modified Gold Nanoparticles in a Block Copolymer Template

“…Several experimental methods have been developed for incorporating inorganic nanoparticles into polymeric nanostructures. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The most popular approach involves the synthesis of nanoparticles in situ within the block copolymer template by using preformed micelles of block copolymers containing metal precursors. However, despite the importance of controlling the arrangement of nanoparticles produced by such methods within the periodic structure of the block copolymer, establishing such control has been difficult.…”

Control of Nanoparticle Location in Block Copolymers

“…[1][2][3] To this end, a variety of methods have been developed to selectively incorporate nanoparticles into the desired block copolymer domains. [4][5][6][7][8][9][10] However, success in controlling their precise location within the domains remains limited.…”