화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.45, No.4, 501-510, July, 2021
DOI10.7317/pk.2021.45.4.501  Export Citation
코이어섬유매트의 알칼리처리에 사용한 NaOH 용액의 농도와 온도가 코이어섬유매트/불포화폴리에스터 복합재료의 기계적 특성에 미치는 영향
Effects of Concentration and Temperature of NaOH Solution for Alkali Treatment of Coir Fiber Mat on the Mechanical Properties of Coir Fiber Mat/Unsaturated Polyester Composites
김기현, 조동환†
  • 금오공과대학교 고분자공학과
Kihyun Kim, and Donghwan Cho†
  • Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Korea
E-mail:
초록
본 연구에서는 압축성형공정을 통해 코이어섬유매트/불포화폴리에스터(UPE)수지 복합재료를 제조하고, 이들의 섬유-매트릭스 계면특성, 인장특성, 굴곡특성 및 충격특성에 미치는 코이어섬유매트의 알칼리처리에 사용한 NaOH 용액의 농도와 온도의 영향을 조사하였다. 복합재료의 특성들은 알칼리처리에 의해 크게 향상되었으며, 코이 어섬유의 표면 topography와 섬유-매트릭스 사이의 층간전단강도는 NaOH 농도에 의존하였다. 25 ℃에서 코이어섬유매트를 알칼리용액으로 처리할 경우, 10 wt% NaOH를 사용하는 것이 복합재료의 물성 향상에 가장 효과적이었다. 5 wt% NaOH 용액을 사용하여 70 ℃에서 코이어매트섬유를 처리하였을 때 가장 우수한 복합재료의 기계적 특성과 충격저항성을 나타냈으며, 10-15 wt% NaOH 용액으로 25 ℃에서 처리한 경우보다 복합재료의 특성 향상에 더 크게 기여하였다. NaOH 용액에 의한 알칼리처리가 복합재료의 물성 향상에는 복합재료를 구성하고 있는 코이어섬유의 머서화를 통한 코이어섬유와 UPE 매트릭스 사이의 계면접착의 향상이 중요한 역할을 하였다.
In the present study, coir fiber mat/unsaturated polyester (UPE) composites were produced by compression molding process and the effect of concentration and temperature of NaOH solution for alkali-treatment of coir fiber mat on their fiber-matrix interfacial, tensile, flexural, and impact properties was investigated. The properties were we highly improved by alkali-treatment and the coir fiber surface topography and the interlaminar shear strength depended on the NaOH concentration. When coir fiber mat was alkali-treated at 25 C, use of 10 wt% NaOH was most effective to increase the properties. Alkali-treatment of the mat with 5 wt% NaOH solution at 70 ℃ exhibited the best mechanical and impact properties of resulting composites, more contributing to enhancing the composite properties than with 10-15 wt% NaOH solution at 25 ℃. The enhancement of the interfacial adhesion between coir fiber and UPE matrix through the mercerization of coir fibers consisting of the composite played an important role in improving the composite properties via alkali treatment by NaOH solution.
Keywords:coir fiber mat;natural fiber composite;unsaturated polyester;alkali-treatment;properties
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