맥간공예에 사용되는 보릿대의 표면 미세구조와 물성 분석
Analysis of Surface Microstructures and Material Properties of Dried Barley Stalks for Artistic Marquetry
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대표적인 짚공예 가운데 하나인 맥간공예(혹은 보릿대 조각공예)는 표면이 매끄럽고 광택이 나는 보릿대를 활용하고 있으며 최근에 국내뿐아니라 해외로 전파되고 있다. 보릿대 표면의 줄기 방향과 나란한 미세 줄무늬는 맥간공예 작품에 입체감과 각도에 따른 색감을 갖게 한다. 하지만아직까지 보릿대 표면의 형상과 물성이 체계적으로 분석되지 않은 실정이다. 본 연구에서는 고해상도 실체현미경과 고해상도 3차원 X-ray 현미경을이용하여 보릿대의 미세구조를 이미징할 뿐만 아니라 보릿대의 물접촉각과 인장 강도를 측정하여 보릿대의 재질을 분석하였다. 이를 통해 보릿대최외각에 존재하는 4-6 μm 너비의 미세요철에 의한 줄무늬, 소수성을 띈 겉면, 친수성을 띈 속면, 그리고 60 MPa 정도의 줄기 방향의 항복강도를갖는 보릿대 특성을 확인하였다. 본 연구에서 제시한 분석 방법으로 볏짚을 비롯한 다른 짚공예에 사용되는 짚 재료의 특성을 파악한다면 짚의재질을 최대로 활용한 새로운 짚공예로 이어질 것이다.
Abstract
Barley stalk marquetry, a representative stalk craft, uses a striped and glossy surface of the barley stalk. It has recently been spreading not only domestically but also abroad. The fine stripe pattern that is parallel to the stem direction of the barley gives its planar craft three-dimensional effects and different colors depending on the angle of view. However, the morphologies and physical properties of the surface of the dried barley stalk have not yet been analyzed in detail. In this study, the characteristics of the barley stalk were investigated by not only imaging its microstructure through a high-magnification stereomicroscope and a high-resolution 3D X-ray microscope, but also measuring its water contact angle and tensile strength. The outermost layer of the dried barely stalk shows fine stripes of 4-6 μm in width and hydrophobic surface whereas its inner part has irregular fiber networks and relatively hydrophilic surface. The uniaxial yield strength of flattened barley stalk is around 60 MPa. Further identification of material properties of other stalks with the analysis methods presented in this study will allow stalk crafts to utilize stalk materials to the fullest to attempt new artistic creation.
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