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Control of Branching in Radical Polymerization Based on New Concept

Research Project

Project/Area Number 10650869
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 高分子合成
Research InstitutionOsaka City University

Principal Investigator

YAMADA Bunichiro  Osaka City University, Faculty of Engineering, Professor, 工学部, 教授 (50047198)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsRadical Polymerization / Catalytic chain transfer / Branched polymer / Cobaloxime / Addition-fragmentation chain transfer / Cross-linking / Polymerizable chain transfer agent / Bifunctional chain transfer agent / 2分子停止 / ブロックポリマー
Research Abstract

A non-polymcrizable dimer of methyl methacrylatc (MMA) is feasible to radical addition to yield an adduct radical which is too stable to react mutually nor to add to monomer. The adduct radical primarily undergoes coupling with propagating radical to link two polymer chains through the dimer unit. The addition and coupling involving the dimer could be employed for gel-free branch formation in radical polymerization. The reactivities of various dimers of α-methyl vinyl compounds such as MMA, metherylonitrile (MAN), α-methylstyrene, and p-substituted α-methylstyrene were examined. Among these, the dimer of MAN participated only in addition/coupling to connect two polymer chains. Polystyrene radical added to the MMA dimer and mainly couple with the adduct radical. However, the adduct radical also yield the polystyrene bearing the unsaturated end group through β-fragmentation of the adduct radical. The dimer structure was introduced into polymer using a polymerizable addition-fragmentation chain transfer agent and a bifunctional addition-fragmentation chain transfer agent. These transfer agents involved one and two α-alkylthiomethylacryloyl groups as chain transferable groups. The polymerization of MMA in the presence of polymerizable transfer gent gave the poly(MMA) with the chain transferable side group which was further involved in addition/fragmentation chain transfer to link poly(MMA) chain. The side chain could also involve branching points. The polymerization of styrene in the presence of the poly(MMA) was found to result in a hyper branched block copolymer. The bifunctional chain transfer agent introduced the carbon carbon double bond to both end of poly(MMA). These double bonds were employed for addition/coupling of polystyrene radical to afford a branched block copolymer without gelation.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 田中 健太、山田 文一郎: "Reactions of Bifunctional Addition-fragmentation Chain Transfer Agent for Syntheses of Polymer Bearing Unsaturated Moieties both Ends"Macromolecular Chemistry and physics. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 山田 文一郎、鴻巣 修、田中 健太、奥 文法: "Preparation of branched polymer by radical polymerization using polymerizable chain transfer agent"Polymer. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kenta Tanaka, Bunihciro Yamada: "Reactions of Bifunctional Addition-fragmentation Chain Transfer Agent for Synthesis of Polymer Bearing Unsaturated Moieties at Both Ends"Macromol.Chem.Phys.. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] BunichiroYamada, Osamu Konosu, Kenta Tanaka, and Fuminori Oku: "Architecture of Branched Polymer by Radical Polymerization"Polymer. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 田中 健太、山田 文一郎: "Reactions of Bifunctional Addition-fragmentation Chain Transfer Agent for Synthesis of Polymer Bearing Unsaturated Moieties at Both Ends"Macromolecular Chemistry and Physics. (発表予定).

    • Related Report
      1999 Annual Research Report
  • [Publications] 山田 文一郎、鴻巣 修、田中 健太、奥 文法: "Preparation of branched polymer by radical polymerization using polymerizable chain transfer agent"Polymer. (発表予定).

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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