| Abstrakt: |
Cellulose acetate (CA) is an important derivative of cellulose sourced from various origins, notably traditional markets like cotton and wood. This study investigated the production of CA mats through electrospinning from solutions that were made by mixing dimethylacetamide (DMAc) and tetrahydrofuran (THF) in different ratios, with varying CA (average degree of substitution and Mw of 2.5 and roughly 153000 g/mol, respectively) concentrations and electrospinning parameters, such as flow rate, and voltage. After, the tests were carried out using 8% as CA concentration and the static collector, 20 kV, and a 5 µl/min flow rate were selected to proceed. The mat formed from the 8 wt% CA solution, with a ratio of 35/65, was composed of bead-free fibers. For most mats, the tensile strength-at-break and the tensile modulus increased with the concentration of CA in the solution that generated the mat. The mat composed of 11 wt% CA was primarily composed of a network of ultrathin fibers free of beads and exhibited superior tensile properties compared to the other mats (tensile strength-at-break of 4.3 MPa, tensile modulus of 102 MPa, and an elongation-at-break of 26%). Thus, an 11 wt% CA solution was used to form mats in the rotating collector. At 2028 rpm, a mat with thinner fibers (average diameter of 157 nm) and not in a network was formed, in addition to greater tensile properties (tensile strength-at-break of 14.0 MPa, a tensile modulus of 198 MPa, and an elongation-at-break of around 42%) than the mat formed on the static collector. |
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