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1999 Fiscal Year Final Research Report Summary

New Materials based on Organosilicon Chemistry

Research Project

Project/Area Number 09044101
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionScience University of Tokyo

Principal Investigator

SAKURAI Hideki  Faculty of Science and Technology, Science University of Tokyo Prof., 理工学部, 教授 (70025873)

Co-Investigator(Kenkyū-buntansha) SANJI Takanobu  Faculty of Science and Technology, Science University of Tokyo Assistant, 理工学部, 助手 (00287484)
ABE Yoshimoto  Faculty of Science and Technology, Science University of Tokyo Prof., 理工学部, 教授 (20084460)
Project Period (FY) 1997 – 1999
KeywordsPolysilane / Micelle / Block Copolymer / Cross-Linking / Self-Assembly / Nano-Organized System / Silyene / Disilene
Research Abstract

We report the formation of self-assembled micelles and shell-cross-linked micelles of amphiphilic polysilane block copolymers. Poly(1, 1-dimethyl-2, 2-dihexyldisilene)-b-poly-(methacrylic acid) (PMHS-b-PMAA) were prepared by sequential anionic polymerization of masked disilenes and then with trimethylsilyl methacrylate, followed by hydrolysis of the trimethylsilyl protecting group. PMHS-b-PMAA is soluble but obviously self-assembled in water to form polymer micelles. Since PMHS-b-PMAA has a reactive methacrylic acid block, a shell cross-linking reaction of the polymer micelles was examined to form shell-cross-linked micelles (SCM). Encapsulating and release of guest molecules for the nano-organization system were examined. In this system, the polysilane core is surrounded by a partially cross-linked shell of poly(methacrylic acid). Since the polysilane core part can undergo photochemical degradation, it is expected to provide hollow sphere particles (hollow shell cross-linked micelles, HSCM) by a photochemical process. The synthesis of nanometer-sized hollow particles derived from polysilane shell cross-linked micelles and demonstrates their macromolecular architectures that undergo reversible uptake of guest molecules are also examined.
Next, we report the intramolecular dimerization of remotely generated silylenes in a molecule. Alpha, omega-bissilylene, such as 1, 6-disilahexane-1, 1, 6, 6-tetrayl, generated at low temperature undergo efficient intermolecular dimerization to give cyclic disilenes, 1, 2-disilacyclohexene-1. Cyclic disilenes are trapped by alcohols or 2, 3-dimethylbutadiene.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T. Sanji: "Encapsulation of Polysilane into Shell Cross-Linked Micelles"Chem. Commun.. 2201-2202 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sanji: "Self-Assembled Micelles of Amphiphilic Polysilane Block Copolymers"Macromolecules. 32. 5718-5720 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sanji: "A Statistical Model for the Cooperative Thermochromic Transition of Polysilanes"Macromolecules. 32. 3788-3794 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hoshi: "Synthesis of Disilacycloalkenes by Ruthenium Catalyzed Ring-Closing Metathesis (RCM) Reaction of α. ω-Bis(allyldimethylsilyl)-Substituted Compounds"Bull. Chem. Soc. Jpn.. 72. 821-827 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sanji: "Silole-Incorporated Polysilanes"J. Am. Chem. Soc.. 120. 4552-4553 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sanji: "Anionic Ring Opening Polymerization of Octamethyltetrasilacyclopentane"Chem. Lett.. 1121-1122 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Sakurai: "The Chemistry of Organic Silicon Compounds"J. Wiley & Sons,. 27 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Sakurai: "Macromolecular Design of Polymeric Materials"Marcel Dekker, Inc.. 16 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sanji, Y.Nakatsuka, F.Kitayama, and H.Sakurai: "Encapsulation of Polysilane into Shell Cross-Linked Micelles"Chem.Commun.. 2201-2202 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, F.Kitayama, and H.Sakurai: "Self-Assembled Micelles of Amphiphilic Polysilane Block Copolymers"Macromolecules. 32. 5718-5720 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, M.Funaya, and H.Sakurai: "Anionic Polymerization of Tetraphenylgermole-spiro-cyclogermatetrasilane, A Striking Contrast in the Mechanism to the Corresponding Silole Case"Chem.Lett.. 547-548 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, K.Sakamoto, H.Sakurai, and K.Ono: "A Statistical Model for the Cooperative Thermochromic Transition of Polysilanes"Macromolecules. 32. 3788-3794 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hoshi, H.Yasuda, T.Sanji, and H.Sakurai: "Synthesis of Disilacycloalkenes by Ruthenium Catalyzed Ring-Closing Metathesis (RCM) Reaction of α, ω-Bis(allyldimethylsilyl)-Substituted Compounds"Bull.Chem.Soc.Jpn.. 72. 821-827 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, M.Iwata, M.Watanabe, T.Hoshi, and H.Sakurai: "Highly Selective Mono- and Polyallylation of Polychlorosilanes and Disilanes"Organometallics. 17. 5068-5071 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, T.Sakai, C.Kabuto, and H.Sakurai: "Silole-Incorporated Polysilanes"J.Am.Chem.Soc.. 120. 4552-4553 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, K.Sakamoto, and H.Sakurai: "Kinetics of Chain Organization at the Thermochromic Transition of Polysilanes"Chem.Lett.. 255-256 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hoshi, R.Shimada, C.Kabuto, T.Sanji, and H.Sakurai: "Molecular Structure and Photochemical Reactions of Trimethylsilylmethyl-Substituted Masked Disilene"Chem.Lett.. 427-428 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sakurai, T.Sanji, T.Sakai, and H.Hanao: "Anionic Polymerization of Silicon-Containing Rings"Phosphorus, Sulfur, and Silicon. 124. 173 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sanji, H.Hanao, and H.Sakurai: "Anionic Ring Opening Polymerization of Octamethyltetrasila-cyclopentane"Chem.Lett.. 1121-1122 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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