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Received August 23, 2023
Accepted August 23, 2023
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PTFE의 결정화도와 인장 강도에 미치는 풀림(annealing) 공정의 영향
Effects of Annealing Process on the Crystallinity and Tensile Strength of PTFE
부경대학교 응용화학공학부, 608-739 부산시 남구 용당동 산 100
Division of Applied Chemical Engineering, Pukyong National University, San 100, Yongdang-Dong, Nam-Gu, Busan 608-739, Korea
csju@pknu.ac.kr
Korean Chemical Engineering Research, February 2010, 48(1), 53-57(5), NONE Epub 4 March 2010
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Abstract
본 연구에서는 290~350 ℃의 범위에서 PTFE(polytetrafluoroethylene)의 풀림(annealing) 공정을 수행하여, 결정화도와 인장 강도에 미치는 영향을 조사하였다. 풀림 공정은 대기압에서 진행되었고, 공정 시간은 8 시간까지 진행하였다. 인장강도의 측정 및 주사전자현미경(scanning electron microscope)의 측정을 통하여 PTFE 시편의 이방성을 확인하였다. 시차주사열량분석(differential scanning calorimetry)을 통하여 공정 전후의 결정화도를 측정하였고, 풀림 공정이 행해진 PTFE로부터 결정화도의 감소와 인장 강도의 증가를 확인하였다. 풀림 공정이 시행된 PTFE의 결정화도와 인장강도는 선형적 증감(增減) 관계를 나타내었지만, 풀림공정 시행 전의 PTFE는 이 선형 관계에서 벗어나 있었다. 그리고_x000D_
풀림 공정온도가 350 ℃이고 공정시간이 6 시간일 때, 가장 낮은 결정화도와 가장 높은 인장강도를 얻을 수 있었다.
In this work, we made experimental studies on the annealing process of PTFE(polytetrafluoroethylene) at 290~350 ℃ and examined the effects on crystallinity and tensile strength of PTFE. The experiments were performed at air atmosphere and the processes progressed up to 8 hours. From measuring tensile strength and SEM(scanning electron_x000D_
microscopy) observation, we could know PTFE was anisotropic material due to the band structure. Crystallinity of raw and annealed PTFE was measured by DSC(differential scanning calorimetry). As a result, crystallinity of annealed PTFE decreased and tensile strength increased. Also, we could verify the relation between crystallinity and tensile strength of_x000D_
annealed PTFE was linear. Raw PTFE, however, dropped out from the linear relation. Finally, PTFE annealed at 350 ℃ for 6 hours showed the smallest crystallinity and the largest tensile strength.
Keywords
References
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Brown EN, Dattelbaum DM, Polymer, 46(9), 3056 (2005)
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