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Amphiphilic polysilane-methacrylate block copolymers - Formation and interesting properties.

Sakurai H - Proc. Jpn. Acad., Ser. B, Phys. Biol. Sci. (2006)

Bottom Line: In addition to interesting properties, SCM is indicated to be able to form hollow sphere particles (hollow shell cross-linked micelles, HSCM) by a photochemical process.Reversible encapsulation of guest molecules by SCM and HSCM is demonstrated.Finally, SCM can be used as the template for the synthesis of metal nanoparticles, which may be used as catalysts.

View Article: PubMed Central - PubMed

Affiliation: Professor Emeritus, Tohoku University.

ABSTRACT
Several polysilane block copolymers have been prepared by the newly developed method, anionic polymerization of masked disilenes. Especially amphiphilic block copolymers of poly(1,1-dimethyl-2,2-dihexyldisilene) and poly methacrylate are focused. Poly(1,1-dimethyl-2,2-dihexyldisilene)-b-poly(2-hydroxyethyl methacrylate) (PMHS-b-PHEMA) is the first example of the amphiphilic polysilane copolymer that can form micelles in polar solvents. Poly(1,1-dimethyl-2,2-dihexyldisilene)-b-poly(methacrylic acid) (PMHS-b-PMAA) is more polar than (PMHS-b-PHEMA), soluble in water to form micelles. The cross-linking reaction of (PMHS-b-PMAA) with 1,10-diaza-4,7-dioxadecane and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride afforded the first shell cross-linked micelles (SCM) of polysilane. In addition to interesting properties, SCM is indicated to be able to form hollow sphere particles (hollow shell cross-linked micelles, HSCM) by a photochemical process. Reversible encapsulation of guest molecules by SCM and HSCM is demonstrated. Finally, SCM can be used as the template for the synthesis of metal nanoparticles, which may be used as catalysts.

No MeSH data available.


Characteristics of polysilanes.
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f1-82_257: Characteristics of polysilanes.

Mentions: Polysilanes,1) Si-Si σ-bonded polymers, are structurally analogous to C-C σ-bonded polymers such as polyethylene and polystyrene because they have linear homo-catenated backbones. They are relatively thermally stable with proper substituents. However, due to high orbital energies (or low ionization energies) of Si-Si σ-orbitals and σ-conjugation, polysilanes exhibit several interesting electronic and optical properties, which often characterize polysilanes as one-dimensional electronic wires. Thus during the last decades, polysilanes have been widely investigated because of their potential applications in the field of materials science (Fig. 1).


Amphiphilic polysilane-methacrylate block copolymers - Formation and interesting properties.

Sakurai H - Proc. Jpn. Acad., Ser. B, Phys. Biol. Sci. (2006)

Characteristics of polysilanes.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4338817&req=5

f1-82_257: Characteristics of polysilanes.
Mentions: Polysilanes,1) Si-Si σ-bonded polymers, are structurally analogous to C-C σ-bonded polymers such as polyethylene and polystyrene because they have linear homo-catenated backbones. They are relatively thermally stable with proper substituents. However, due to high orbital energies (or low ionization energies) of Si-Si σ-orbitals and σ-conjugation, polysilanes exhibit several interesting electronic and optical properties, which often characterize polysilanes as one-dimensional electronic wires. Thus during the last decades, polysilanes have been widely investigated because of their potential applications in the field of materials science (Fig. 1).

Bottom Line: In addition to interesting properties, SCM is indicated to be able to form hollow sphere particles (hollow shell cross-linked micelles, HSCM) by a photochemical process.Reversible encapsulation of guest molecules by SCM and HSCM is demonstrated.Finally, SCM can be used as the template for the synthesis of metal nanoparticles, which may be used as catalysts.

View Article: PubMed Central - PubMed

Affiliation: Professor Emeritus, Tohoku University.

ABSTRACT
Several polysilane block copolymers have been prepared by the newly developed method, anionic polymerization of masked disilenes. Especially amphiphilic block copolymers of poly(1,1-dimethyl-2,2-dihexyldisilene) and poly methacrylate are focused. Poly(1,1-dimethyl-2,2-dihexyldisilene)-b-poly(2-hydroxyethyl methacrylate) (PMHS-b-PHEMA) is the first example of the amphiphilic polysilane copolymer that can form micelles in polar solvents. Poly(1,1-dimethyl-2,2-dihexyldisilene)-b-poly(methacrylic acid) (PMHS-b-PMAA) is more polar than (PMHS-b-PHEMA), soluble in water to form micelles. The cross-linking reaction of (PMHS-b-PMAA) with 1,10-diaza-4,7-dioxadecane and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride afforded the first shell cross-linked micelles (SCM) of polysilane. In addition to interesting properties, SCM is indicated to be able to form hollow sphere particles (hollow shell cross-linked micelles, HSCM) by a photochemical process. Reversible encapsulation of guest molecules by SCM and HSCM is demonstrated. Finally, SCM can be used as the template for the synthesis of metal nanoparticles, which may be used as catalysts.

No MeSH data available.