Abstract
The key goal of this study was to compare the sorption kinetics properties of poly-tetrafluoroethylene (PTFE) processed either by spark plasma sintering (SPS-PTFE) or extrusion methods (Ext-PTFE). A gravimetric-sorption technique was used to obtain kinetic and equilibrium adsorption data at room temperature in several liquids (toluene, n-hexane, tetrahydrofuran and chloroform). Sorption kinetics was quantified using the Berens-Hopfenberg empirical model. The results are discussed in terms of liquid diffusion and polymer relaxation. An attempt was made to correlate the crystallization rate, apparent diffusion coefficient and sorption rate for the series of samples. Additionally, the effect of sorption kinetics on the structure and mechanical properties of PTFE samples was investigated. Swelling of SPS-PTFE reduces slightly the crystallite thickness, the Young's modulus and yield stress. In contrast, the crystalline phase is less impacted by swelling for Ext-PTFE samples for witch Young's modulus is increased under the combined effect of swelling and tensile stress.
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