Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Influence of Fiber Array Direction on Mechanical Interfacial Properties of Basalt Fiber-reinforced Composites

현무암섬유 섬유 배향에 따른 현무암섬유 강화 복합재료의 기계적 계면특성 영향

  • Received : 2014.04.26
  • Accepted : 2014.08.21
  • Published : 2015.03.25
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Abstract

In this work, the effect of fiber array direction including $0^{\circ}$, $0^{\circ}/90^{\circ}$, $0^{\circ}/45^{\circ}/-45^{\circ}$ was investigated for mechanical properties of basalt fiber-reinforced composites. Mechanical properties of the composites were studied using interlaminar shear strength (ILSS) and critical stress intensity factor ($K_{IC}$) measurements. The cross-section morphologies of basalt fiber-reinforced epoxy composites were observed by scanning electron microscope (SEM). Also, the surface properties of basalt fibers were determined by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). From the results, it was observed that acid treated basalt fiber-reinforced composites showed significantly higher mechanical interfacial properties than those of untreated basalt fiber-reinforced composites. These results indicated that the hydroxyl functional groups of basalt fibers lead to the improvement of the mechanical interfacial properties of basalt fibers/epoxy composites in the all array direction.

본 연구에서는 현무암섬유의 계면을 황산과 과산화수소로 처리하고 섬유 배향각을 $0^{\circ}$, $0^{\circ}/90^{\circ}$, $0^{\circ}/45^{\circ}/-45^{\circ}$로 달리하여 현무암섬유 에폭시 강화 복합재료의 기계적 특성에 미치는 영향에 대해서 살펴보았다. 기계적 특성은 층간 전단강도(ILSS)와 파괴인성 요소 중 임계응력세기인자($K_{IC}$) 측정을 통하여 고찰하였으며, 섬유의 표면미세구조 변화와 복합재료의 파단면은 주사전자현미경(SEM)으로 관찰하였다. 또한 섬유표면에 계면처리의 여부를 확인하기 위하여 적외선 분광법(FTIR)과 X-선 광전자 분광법(XPS)을 분석하였다. 실험결과 계면처리한 섬유 표면의 -OH 기(hydroxyl)가 증가됨을 확인하였다. 계면처리한 후의 기계적 특성이 계면처리 전의 기계적 특성보다 약 ~100% 증가하였다. 이러한 결과는 표면처리에 의해 섬유와 에폭시 수지 매트릭스 사이의 계면결합력을 증가시킨 것으로 판단된다.

Keywords

Acknowledgement

Grant : 분자촉매 설계 및 응용연구 사업단

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