Morphology, mechanical, and physical properties of wet‐spun cellulose acetate fiber in different solvent‐coagulant systems and in‐situ crosslinked environment

Abstract

Wet spinning is a popular fiber manufacturing process where the effects of solvent and coagulant on the wet‐spun fiber are significant. In this study, we have explored the effect of solvent‐coagulant interaction and in‐situ crosslinking on the wet‐spun cellulose acetate (CA) fiber. Investigation on 12 different solvent‐coagulant systems revealed that variation in the systems resulted in significant variance in morphology and mechanical property of the fiber. Remarkable increase in mechanical property was observed after in‐situ crosslinking with citric acid and polyethylene glycol (PEG). Inclusion of sodium hypophosphite (NaH2PO2) as catalyst further increased tensile modulus (~407%) and crystallinity index (~46%) compared to CA fiber crosslinked with only citric acid. It was established that fiber from CA‐DMSO solution crosslinked with 10% citric acid and 10% PEG extruded in ethanol showed the highest tensile modulus (~30 MPa). This in‐depth study found an appropriate combination of solvent‐coagulant for forming stable CA fiber, with the addition of crosslinkers and catalyst further increasing the strength and usability of the fiber.

Green Approach to Recover the Cellulose Acetate Fiber from Used Cigarette Butts, and Characterize the Filter Fiber

“…Because of the high porosity and fibrousness, the tenacity of the fiber is comparatively lower than that of the cotton fiber and the elongation to break (%) is higher. 50 The average tenacity and elongation of the CBFs were found to be 1.1 gm/den and 18.5%, respectively. The breaking tenacity of the CBFs was a little lower than the commercial cellulose acetate fiber 51 because of the chemical modification with NaOH.…”

Stimulus-Responsive Graphene with Periodical Wrinkles on Grooved Microfiber Arrays: Simulation, Programmable Shape-Shifting, and Catalytic Applications

“…The FEA was used to intelligently predict the dynamic shape-shifting of RGO/CA under stimulus, and facilitated us to optimize the structural parameters (e.g., thickness ratio of CA and RGO) of a smart mat. Considering that the Young's modulus of CA under wet conditions is lower than that under dry, 28 which might result in a larger strain upon the same stress and thus a larger amplitude of actuation, the dry modulus was used in simulations to reveal the minimum shape-shifting of RGO/CA upon stimulus. As seen from the snap of simulation results, the colors in the simulation map illustrated the gradient distribution of the strain (Figure 3B).…”

Cellulose-Based Nanofibers Processing Techniques and Methods Based on Bottom-Up Approach—A Review

“…For some techniques such as solution blow spinning, pure CA nanofibers preparation is still a challenge and, up until now, CA nanofibers were successfully spun only alongside other polymers such is PAN [78]. On the other hand, wet spinning of CA can be used in coaxial configuration, alongside CNFs, to produce mechanically strong and highly waterabsorptive filaments [41,[81][82][83]. Currently, electrospinning is by far the superior technique for the production of cellulose acetate nanofibers, even though it has its own disadvantages, for example, long production times and the use of high-voltage electrical fields, which could be addressed in the future by exploring other techniques for CA nanofiber preparation, as outlined in Table 3.…”

“…Conventional wet spinning of cellulose usually results in thick fibers within the micrometer range (>20 µm) [81,141], but it can be used for obtaining nanofibers of cellulose acetate with cellulose [82,148]. Cellulose acetate can be used as a carrier polymer in coaxial spinning to prevent filament breakup during wet spinning of CNFs [148].…”