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2003 Fiscal Year Final Research Report Summary

High Performance Kenaf Fiber Reinforced Plastics by Surface Modification and Recycling Method

Research Project

Project/Area Number 14580582
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 環境保全
Research InstitutionTokyo Institute of Technology

Principal Investigator

SEMBOKUYA Hideki  Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助手 (70313343)

Project Period (FY) 2002 – 2003
KeywordsNatural fiber / Kenaf / Composite Material / Plastic / Recycle / Surface treatment
Research Abstract

Kenaf fiber was collected from the kenaf, Hibiscus cannabinus L. in order to use the reinforcing fiber of FRP. Mechanical properties of kenaf FRP and recycling methods were investigated.
The bast (skin) of kenaf stem was treated in 5wt% sodium hydroxide solution at 80℃. Kenaf fiber was obtained after neutralization, washing, and drying. Two types of kenaf fiber were prepared ; 5 mm length short fiber for random orientation FRP and continuous fiber for unidirectional FRP. In the case of long fiber, preforms were fabricated by arranging bundles of long fiber in one direction and pressing. The preforms were impregnated by unsaturated polyester resin and then cured. Three point bending tests of kenaf FRP were carried out to evaluate flexural strength and modulus.
The fiber content limit was 30wt% for random orientation FRP. The strength and modulus of FRP decreased in the low fiber content region and they recovered by filling more fibers. In the case of unidirectional long fiber FRP, the fiber content could be 50wt%. The flexural strength of unidirectional FRP was 3 times as large as that of neat resin. The flexural modulus was 5 times.
The silane treated kenaf was used in order to improve the interfacial bonding. In the low content region, the treatment was effective. On the other hand, the properties of treated kenaf FRP were not improved remarkably in the high content region.
Chemical decomposition of kenaf FRP was tried by using alkaline solution for the purpose of recycling. It was difficult to decompose sufficiently to low molecular weight. Then, crushed particles of kenaf FRP was used as filler of kenaf FRP as material recycling. The mechanical properties of recycled kenaf FRP could be stated good in general by optimizing the constitution of laminates.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 仙北谷英貴, 高橋隆一郎, 矢嶋倫明, 久保内昌敏, 津田 健: "ケナフFRPの力学的特性に関する研究"材料の科学と工学. 40巻,5号. 55-58 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 矢嶋倫明, 仙北谷英貴, 久保内昌敏, 津田 健, 高橋隆一郎: "ケナフ繊維強化プラスチックの特性評価"第32回FRPシンポジウム講演論文集. 187-188 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hideki SEMBOKUYA, Ryuichiro TAKAHASHI, Michiaki YAJIMA, Masatoshi KUBOUCHI, Ken TSUDA: "A Study on Mechanical Properties of Kenaf FRP"Materials Science and Technology (Japanese). 40[5]. 55-58 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Michiaki YAJIMA, Hideki SEMBOKUYA, Masatoshi KUBOUCHI, Ken TSUDA, Ryuichiro TAKAHASHI: "Evaluation of Mechanical Properties of Kenaf Fiber Reinforced Plastics"32th FRP Symposium (Japanese). 187-188 (2003)

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

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Published: 2005-04-19  

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