Untitled

Ishizu, Koji; Ohta, Yoshihiro

doi:10.1023/a:1023698423378

Cited by 10 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…30 Ishizu and Ohta have established the novel construction of rigid nanocylinders with hyperbranched polymer side groups via living radical mechanism. 31 Scheme 3 shows the synthetic strategy of nanocylinders with hyperbranched side groups. Multifuctional PS (PSD) having N,N-diethyldithiocarbamate (DC) pendant groups which becomes the core in the final product serves as starting material.…”

Section: G'mentioning

confidence: 99%

Architecture of Multi-Component Copolymer Brushes: Synthesis, Solution Properties and Application for Nanodevices

Ishizu

2004

Polym J

View full text Add to dashboard Cite

ABSTRACT:In this review article, we describe the architecture of multi-component copolymer brushes. These copolymer brushes can be classified into tree types, i.e., double-cylinder-type, prototype, and block-type. Double-cylinder-type copolymer brushes were prepared by free-radical polymerization of corresponding diblock macromonomer or by the ''grafting from'' approach using atom transfer radical polymerization (ATRP). Alternating free-radical copolymerization of the mixture of two macromonomers provided prototype copolymer brushes. ATRP was applied to the synthesis of AB-type brush-block-brush (block-type) copolymers. All copolymer brushes were molecularly dissolved in a dilute solution due to densely branched side chains and took geometrically anisotropic conformation such as cylinder with increasing aspect ratio. In self-assembly process of amphiphilic prototype copolymer brushes in water, hierarchical generations from small rods to large rods were observed, because copolymer brushes exhibited phase-separated hydrophobic/hydrophilic domains. Moreover, binding of anionic/nonionic polyeletrolyte prototype brushes with cationic linear polyelectrolyte formed an interesting complex of a high order by electrostatic interaction. On the other hand, the molecular wires in electronic nanodevices were prepared by forming conducting polypyrroles with an internal core of double-cylider-type copolymer brushes as templates, where as the outer cylinder parts play the role of an insulator. [DOI 10.1295/polymj.36.775] KEY WORDS Multi-component Copolymer Brush / Double-cylinder-type / Prototype / Blocktype / Macromonomer / ATRP / Aternating Copolymerization / Molecular Wire / Binding / Nanostructured polymers are of rapidly growing interest because of their sized-coupled properties. Generally, the branched polymer has a smaller hydrodynamic dimension than a linear polymer with the same molecular weight. The interest in branched polymers arises from their compactness and their enhanced segment density. Recently, a new class of branched architectural polymers, such as nanocylinders, is attracting attention with expectation that their unique structures may result in unusual properties. It is well known that comb polymers with densely grafted side chains in a good solvent can adopt a worm-like cylinder brush conformations, in which the side chains are stretched in the direction normal to the backbone, owing to the excluded-volume interaction. The polymerization of macromonomers provides regular multi-branched polymers with dense branching. Since both the degree of polymerization (DP n ) and the length of branches are varied, poly(macromonomer)s, often so-called ''polymer brushes'', are interesting models for the study of branched polymers.1-9 More recently, we have systematically investigated the architecture of multi-component copolymer brushes. Figure 1 shows the illustration of three types of multi-component copolymer brushes. Various strategies can be designed to construct such structures. For example, one strategies for the...

show abstract

Section: G'mentioning

confidence: 99%

Architecture of Multi-Component Copolymer Brushes: Synthesis, Solution Properties and Application for Nanodevices

Ishizu

2004

Polym J

View full text Add to dashboard Cite

show abstract

“…These polymers are of high interest due to their stiffened polymer chains and cylindrical conformation. 16,17 Polymer particles with non-spherical shapes and stiffness exert striking comprehensive effects in a variety of elds and circumstances such as nanocomposites and drug delivery carriers, etc. [18][19][20][21][22][23] It was reported that elliptical polystyrene particles have special characteristics in biological interactions, especially affecting the internalization process of a cell or transportation through an organ such as a spleen despite their large size.…”

Section: Introductionmentioning

confidence: 99%

“…Hyperbranched-linkinghyperbranched structures were formed from SCCLP, which were absolutely different from those "hyper-graing" polymers or non-covalent supramolecular structures. 16,26,27 The proposed mechanism of SCCLP is illustrated in Scheme 1. SCVP of inimers affords hyperbranched polymers.…”

Section: Introductionmentioning

confidence: 99%

One-pot self-coupling concurrent living polymerizations of inimers to synthesize hyperbranched-linking-hyperbranched polymer cylinders via cyclic trithiocarbonate

Zhao

Liu

2014

Polym. Chem.

View full text Add to dashboard Cite

In this paper, we present a convenient one-pot self-coupling concurrent living polymerization strategy for synthesizing one-dimensional hyperbranched-linking-hyperbranched cylindrical macromolecules. A RAFT agent served as a "hyper-linker" to link hyperbranched blocks. The obtained polymers showed high regularity of long-range order evidenced by small angle X-ray diffraction patterns and the lyotropic liquid crystalline phase. The formation mechanism of the hyperbranched-linking-hyperbranched structures and the role of the RAFT agents were investigated.Scheme 1 Mechanism of SCCLP.

show abstract

“…11,12 On the basis of these backgrounds, we presented the novel construction of nanocylinders with hyperbranched side groups via living radical mechanism. 13 These nanocylinders took rigid rod conformation even in a good solvent.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of functionalized double‐cylinder‐type copolymer brushes and crosslinking of internal cylindrical domains

Ishizu

Takano

Ochi

2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

Photoinduced atom transfer radical polymerization (ATRP) was applied to the synthesis of doublecylinder-type copolymer brushes. The procedure included the following steps: (1) photoinduced ATRP of multifunctional polystyrene (PSDC) having N,N-diethyldithiocarbamate (DC) pendant groups with t-butyl acrylate (BA) and (2) subsequent photoinduced ATRP of methyl methacrylate (MMA) with this PBA brush polyinitiator provided double-cylinder-type brushes [PSDC-graft-(PBA-block-PMMA)]. Solution properties of such doublecylinder-type brushes were investigated by dynamic light scattering. As a result, these copolymer brushes exhibited an isotropic conformation in solution. After hydrolysis of PBA blocks, we obtained amphiphilic copolymer brushes: PSDC-graft-[poly(acrylic acid) (PAA)-block-PMMA]. Crosslinking of PAA internal cylindrical domains was performed by the reaction of PAA blocks with ethylenediamine.

show abstract

Untitled

Cited by 10 publications

References 21 publications

Architecture of Multi-Component Copolymer Brushes: Synthesis, Solution Properties and Application for Nanodevices

Architecture of Multi-Component Copolymer Brushes: Synthesis, Solution Properties and Application for Nanodevices

One-pot self-coupling concurrent living polymerizations of inimers to synthesize hyperbranched-linking-hyperbranched polymer cylinders via cyclic trithiocarbonate

Synthesis of functionalized double‐cylinder‐type copolymer brushes and crosslinking of internal cylindrical domains

Contact Info

Product

Resources

About