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Membranes 2014, 4 292 2.2. Mechanical Properties Figure 3. DSC plots of CS-based membranes. ETS-10/IL/CS ETS-10/CS IL/CS CS 350 400 450 500 550 600 Temperature [K] Table 2 collects the mechanical properties of the CS and MMMs studied in this work. The tensile strength of pure CS membranes agrees with values reported in literature [31], despite differences on the precursor CS powder employed and membrane preparation protocols, which account from the natural origin of this material. Table 2. Conditions of the tensile tests (General conditions: sample width 5 mm, grip to grip distance 40.20 ± 8.76 mm). Membrane Material Composition CS IL/CS ETS-10/CS ETS-10/IL/CS Thickness (μm) 121.9 ± 3.96 128.0 ± 3.57 130.0 ± 4.50 168.0 ± 5.0 Filler Content (wt %) 0 5 5 5 (each) Tensile Strength (MPa) 31.63 ± 7.41 16.09 ± 11.04 24.30 ± 4.88 19.93 ± 5.01 Elongation at Break (%) 18.52 ± 8.23 40.44 ± 12.45 14.40 ± 9.38 36.15 ± 3.03 The tensile strength diminishes upon addition of IL and ETS-10 particles. This was attributed to plasticisation of the polymer matrix reflected by the large increase on the value of the elongation at break, for the IL/CS with respect to CS membranes. The introduction of [bmim][CF3SO3] IL in semi crystalline Pebax polymers [32] caused a decrease in elongation at break that has not been observed here. On the other hand, the elongation at break of the CS based membranes decreases upon addition of ETS-10 particles. This is due to the rigidification of the organic polymer [33] by the addition of inorganic fillers. 2.3. Structural and Morphological Properties The increased flexibility imparted to the MMMs by the introduction of the IL was attributed to the singular interaction between CS and IL, and that was the reason to measure FT-IR spectra of the membranes (Figure 4). The CS and 3-component ETS-10/IL/CS membranes demonstrated a broad DSC heat flowPDF Image | Synthesis and Characterisation of ETS-10 Acetate-based Ionic
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