Article
  • Effects of Surface Treatment of Fiber and Crosslinking of Matrix Polymer on Physical Properties of Carbon Fiber Reinforced Thermoplastic Composites : 2. Preparation of Prepreg by Suspension Adsorption and Improvement in Impact Strength of Composites
  • Park TW, Lee JO, Park JM, Ann CH, Lee SH, Suh CS
  • 섬유의 표면처리 및 모재 고분자의 가교가 탄소섬유 강화 열가소성 복합재료의 물성에 미치는 영향 : 2. 현탁흉착법에 의한 프리프레그의 제조 및 충격강도의 향상
  • 박천욱, 이장우, 박종만, 안철흥, 이순한, 서차수
Abstract
With a view to surface-modification for better adhesion between fiber and matrix in carbon fiber(CF)/high density polyethylene(HDPE) composites, acrylamide(AAm) possessing functional groups available for chemical bonding with CF was graft-polymerized onto the same (stem) Polymer as the matrix PE to give HDPE-g-PAAm by the inverse emulsion graft polymerization technique. Graft polymers(GP) synthesized at different conditions of stem polymer molecular weight, concentration of AAm aqueous solution, and contents of emulsifier and initiator were classified and separated into 3 types according to the PAAm content in a GP, i.e., toluen-soluble(TSGP), methanol-dispersible(MDGP), and water-dispersible(WDGP) in the increasing order of PAAm content. In HDPE composites reinforced with CF surface-treated using the GP thus obtained, the effects of such factors as the concentrations of emulsifier and initiator, Mw of the stem polymer, and the type and adsorption amount of GP on the impact strength of laminated composites were investigated for different types of coupling agents. In addition, the influence of the cross-linking of matrix polymer on impact strength of CF/HDPE composite was studied by means of either separate use of preoxide and coagent or their combination. Finally, the "suspension adsorption method" for preparing thermoplastic prepregs based on toluene suspension of PE with filament tows of CF dipped into it was developed, which turned out to give the uniform dispersion of fibers within the matrix resin as well as the relatively easy control of fiber content in a composite.

탄소섬유/고밀도폴리에틸렌 열가소성 복합재의 표면개질제로서 모재고분자와 동일한 폴리에틸렌(PE)에 탄소섬유(CF)의 극성기와 화학반응하는 폴리아크릴아미드(PAAm)를 역상유화 그라프트 중합으로 PE의 분자량(20,000 및 200,000), AAm의 농도, 유화제 및 개시제의 농토를 변화시키면서 중합시켜 각종 그라프트 중합체(GP)를 합성하였다. 생성되는 GP는 그라프트 된 PE의 조성이 큰 톨루엔 가용 GP(TSGP), 중간인 메탄올 분산 GP(MDGP) 및 조성이 가장 적은 수분산 GP(WDGP)로 분리하였다. 이들 GP로서 CF표면을 개질하여 복합재료의 충격강도에 미치는 영향을 아크릴아미드의 농도에 따라 생성되는 GP중의 그라프트 된 PAAm의 함량별 영향, 중합시 사용한 유화제 및 개시제의 농도에 따라 생성되는 GP별 영향, stem polymer의 분자량에 따른 TSGP 및 WDGP별의 효과, 동일한 PE로서 생성된 TSGP 및 WDGP의 영향과 TSGP의 CF표면에 대한 흡착량에 따른 효과들을 비교 검토하였고, 미처리 탄소섬유에 대한 과산화물 및 coagent들의 단독처리 및 동시처리로서 모재의 가교가 복합재료의 충격강도에 미치는 영향도 아울러 조사하였다. 또한 탄소섬유의 filament tow에 PE를 톨루엔의 서스펜션액에서 홉착시켜, prepreg중의 CF 및 수지의 분포가 균일하며, 섬유함유율(volume %)을 쉽게 조절할 수 있는 "suspension adsorption method"를 확립하였다.

Keywords: CF/HDPE composite; graft copolymer; surface modification; suspension-adsorption; crosslinking; impact strength

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1994; 18(6): 984-995

    Published online Nov 25, 1994