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Received August 30, 2010
Accepted September 27, 2010
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다양한 방식의 등통로각압축공정으로 가공된 Poly(lactic acid) 시편들의 열 및 기계적 물성
Thermal and Mechanical Properties of Poly(lactic acid) Specimens Fabricated by Various Equal-channel Angular Extrusion Processes
1충남대학교 바이오응용화학과, 305-764 대전광역시 유성구 궁동 220 2(주)에네트, 320-711 충남 논산시 내동 26 3건양대학교 환경화학공학과, 320-711 충남 논산시 내동 26
1School of Applied Chemistry and Biological Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Korea 2ENET Co., B105, Konyang University, 26 Nae-dong, Nonsan-si, Chungnam 320-711, Korea 3Department of Environmental Chemical Engineering, Konyang University, 26 Nae-dong, Nonsan-si, Chungnam 320-711, Korea
hchoi@cnu.ac.kr
Korean Chemical Engineering Research, April 2011, 49(2), 206-210(5), NONE Epub 12 April 2011
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Abstract
다양한 방식의 등통로각압축공정으로 생분해성 고분자인 폴리젖산수지 시편을 가공하여 각 공정 방식에 따른 시편들의 열 및 기계적 물성의 변화를 조사하였다. 각각 A, BC, C 세 가지의 시편 재 주입 방식과 1, 2, 4의 가공 횟수를 조합한 7개의 시편들을 제작하고, 각 시편의 녹는점, 열분해온도와 같은 열물성을 시차주사열량분석기와 열무게분석기를 사용하여 측정하였다. 시편의 응력변형의 변화를 경도 시험기를 사용하여 측정하고, 각 시편 절단면의 내부 미세구조를 주사전자현미경을 사용하여 관찰하였다. 관찰된 내부 미세구조는 경도시험결과를 설명하는데 정성적인 뒷받침이 되었다. 그 결과 PLA-P2A의 내부 미세 구조가 가장 치밀하고 촘촘히 겹쳐져 있음으로 인하여 내부 응력변형도 가장 많이 관찰되었다.
We fabricated rod-like poly(lactic acid)(PLA) specimens through applying various methods of equal-channel angular extrusion(ECAE) process and investigated the change of thermal and mechanical properties of specimens before and after each ECAE process. Combining three re-injection routes(A, BC, and C) and three pass counts(1, 2 and 4) allowed us to fabricate 7 different PLA specimens. Thermal properties of each specimen were measured by both differential scanning calorimeter and thermo-gravimetric analyzer. Shear strains of each specimen with respect to applied loads were measured by indentation hardness tester. Field emmision scanning electron microscopy was used to observe internal microstructure of cross-section of each specimen. The observed microstructures qualitatively supported the explanation of hardness test results. Among 7 specimens, PLA-P2A showed the biggest shear strain probably due to its dense microstructure.
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