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Effects of Annealing Process on the Crystallinity and Tensile Strength of PTFE  

Kim, Jung-Teag (Division of Applied Chemical Engineering, Pukyong National University)
Kim, Eun-Bong (Division of Applied Chemical Engineering, Pukyong National University)
Kim, Si-Young (Division of Applied Chemical Engineering, Pukyong National University)
Ju, Chang-Sik (Division of Applied Chemical Engineering, Pukyong National University)
Publication Information
Korean Chemical Engineering Research / v.48, no.1, 2010 , pp. 53-57 More about this Journal
Abstract
In this work, we made experimental studies on the annealing process of PTFE(polytetrafluoroethylene) at $290{\sim}350^{\circ}C$ 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 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 annealed PTFE was linear. Raw PTFE, however, dropped out from the linear relation. Finally, PTFE annealed at $350^{\circ}C$ for 6 hours showed the smallest crystallinity and the largest tensile strength.
Keywords
PTFE; Annealing; Crystallinity; Tensile Strength;
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