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1997 Fiscal Year Final Research Report Summary

Development of Epoxy Resins without Hydroxyl Groups in the Molecular Chain

Research Project

Project/Area Number 07555585
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 有機工業化学
Research InstitutionKanagawa University

Principal Investigator

NAKAMURA Shigeo  Kanagawa University Faculty of Engineering, Professor, 工学部, 教授 (10011008)

Co-Investigator(Kenkyū-buntansha) KAMAGATA Kazuo  Nisshin Kaken, Director, 取締役
Project Period (FY) 1995 – 1997
KeywordsEpoxy resin / Curing agent / Active ester / Internal active ester / Trimethylsilyl ester / Dielectric property / Mechanical property / Water absorption
Research Abstract

Epoxy resins without hydroxyl groups after curing are expected to have low water absorption and dielectric constant. They are desirable as high-performance electric and electronic materials. Therefore, various novel curing agents were developed for epoxy curing, and properties of cured resins such as mechanical and dielectric properties and water absorption were examined in detail.
When esters of 1,3,5-trihydroxybenzene with carboxylic acids were used as trifunctional active esters, the reactivity for epoxy curing was decreased with the bulkiness of carboxylic acid residues. The glass transition temperature (Tg) shifts to lower temperatures with increasing length of alkyl chain of carboxylic acid residues but is shifted to higher temperatures by branching the alkyl moiety or incorporating a phenyl group into ester.
The active esters as curing agents improve the water resistance and electric properties of cured resins because no hydroxyl groups are left after curing. However, the epoxy resins cured with active esters have lower Tg values compared to that cured with conventional curing agents. Therefore, novel multifunctional active esters with internal ester bonds were prepared and used as curing agents utilizing the insertion reaction of internal ester groups into epoxy groups. The Tg of cured resins were improved and the maximum value of 142゚C was attained.
Trimethylsilyl ethers of phenol novolak and cresol novolak were used as curing agent, the Tg of cured resins was as low as 110゚C but the water absorption was decreased to 1/10 of that cured with conventional curing agents.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 中村 茂夫, 有馬 聖夫: "Characterization of the Network Structure of Epoxy Resins cured with Active Esters" Int.J.Polyn.Analy.& Characterization. 1. 75-86 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中村 茂夫, 有馬 聖夫: "Effect of Ester Greups on the Viscoulastic Properties of Epoxy Resins" Rept.Piog:Polym.Phys.Japan. 40. 329-332 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 有馬 聖夫, 大堂 三二, 中村 茂夫: "Curing Reaction of Epoxy Resins Using Active Esters sa Curing Agents" J.polym.Sci:Part A:Polym.Chem.in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中村 茂夫: "活性エステルによるエポキシ樹脂の硬化反応と硬化樹脂の物性" 日本接着学会誌. 33. 358-365 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中村 茂夫, 有馬 聖夫: "EPOXY RESINS(curing Reactions)in Polymer Moterials Encyelspedia Vol.13" CRC Press,New York, 8 (1966)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Nakamura and M.Arima: "Characterization of the Network Structure of Epoxy Resins Cured with Active Esters" Int.J.Polymer Analysis & Characterization. 1. 75-86 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nakamura: "Curing of Epoxy Resins with Active Esters and Properties of Cured Resins (Japanese)" Japanese J.of Adhesive Society. 33. 358-365 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nakamura and M.Arima: "Effect of Ester Groups on the Viscoelastic Properties of Epoxy Resins" Repts.Prog.Polym.Phys.Jpn.40. 329-332 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Arima, S.Odo, and S.Nakamura: "Curing Reaction of Epoxy Resins Using Active Esters as Curing Agents" J.Polym.Sci. : Part A : Polym.Chem.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nakamura and M.Arima: EPOXY RESINS (Curing Reactions) Polymer Materials Encyclopedia Vol.13. CRC Press., 2238-2245

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

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Published: 1999-03-16  

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